Understanding Patent Filing: The Complete Guide for Inventors and Businesses
You have invented something new. A device, a process, a formulation, or a design that solves a problem in a way no one has before. Now what?
Patent filing is the legal mechanism that protects your invention from being copied, manufactured, or sold by others without your permission. Without a patent, anyone can use your invention, and you have no legal recourse.
In this comprehensive guide, we explain what a patent is, the different types of patents, what can and cannot be patented, and whether you actually need one.
What Is a Patent?
A patent is an exclusive right granted by the government to an inventor for a limited period (20 years from the filing date). In exchange for this exclusive right, the inventor publicly discloses the details of the invention.
What a Patent Gives You
A granted patent gives you the exclusive right to:
- Make the invention
- Use the invention
- Sell the invention
- Import the invention
- License the invention to others
- Prevent others from doing any of the above without your permission
What Happens After 20 Years?
After the patent term expires (20 years for utility patents), the invention enters the public domain. Anyone can use, make, or sell it without permission or payment. This is the trade-off: temporary monopoly in exchange for public disclosure that advances technology.
Types of Patents
Not all inventions receive the same type of patent protection. In India, the Patents Act, 1970 (as amended) recognizes several types:
1. Utility Patent (Most Common)
This is the standard patent that most people think of. It protects new and useful processes, machines, articles of manufacture, and compositions of matter.
Examples:
- A new pharmaceutical drug formulation
- A manufacturing process that reduces waste
- A software algorithm for data compression
- A new type of battery technology
- An agricultural technique
Term: 20 years from the filing date Requirements: Novelty, inventive step (non-obviousness), industrial applicability
2. Design Patent (Design Registration)
This protects the ornamental design of a functional item, the way something looks, not how it works.
Examples:
- The shape of a smartphone
- The design of a chair
- The pattern on fabric
- The ornamental design of a bottle
- The appearance of a car dashboard
Term: 15 years from the filing date (extendable in 5-year blocks) Requirements: New and original design, not previously published
Note: Design registration is separate from utility patent. A product can have both a design patent (for its appearance) and a utility patent (for its function).
3. Provisional Patent Application
This is a temporary application that establishes an early filing date. It gives you 12 months to file a complete (non-provisional) patent application.
Why file a provisional application:
- Establish priority date quickly
- Buy time to develop the invention further
- Test market viability before investing in a full patent
- Secure funding with a pending patent
- Develop the invention without public disclosure risk
Term: 12 months to file complete application Requirements: Sufficient disclosure to enable understanding of the invention
4. International Patent (PCT Application)
If you want patent protection in multiple countries, you can file a Patent Cooperation Treaty (PCT) application.
Process:
- File a PCT application within 12 months of your first filing
- Enter national phase in each country within 30-31 months
- Each country examines and grants patents independently
Benefit: One filing, multiple countries. Delays national-phase entry costs while you assess market potential.
What Can Be Patented?
Patentable Subject Matter
Under Indian patent law, the following can be patented:
- Products: New and useful machines, devices, articles of manufacture
- Processes: New methods of manufacturing, chemical processes, software algorithms
- Compositions: New chemical compounds, pharmaceutical formulations, materials
- Improvements: Significant improvements to existing inventions
- Biotechnology: New microorganisms, biotechnological processes
- Software: Technical solutions to technical problems (not abstract algorithms)
What Cannot Be Patented
Under Section 3 of the Patents Act, the following are NOT patentable:
| Category | Examples |
|---|---|
| Frivolous inventions | Perpetual motion machines |
| Inventions contrary to public morality | Inventions for bioterrorism, fraud devices |
| Mere discoveries | Scientific principles, mathematical methods |
| Abstract ideas | Business methods, mental acts, games |
| Plants and animals | Natural organisms (except microorganisms) |
| Traditional knowledge | Ayurvedic formulations known traditionally |
| Software per se | Abstract algorithms without technical application |
| Agricultural methods | Methods of cultivation, farming techniques |
| Medical treatments | Methods of surgery, therapy, diagnosis |
Key principle: To be patentable, an invention must be new, non-obvious, and have industrial applicability. It must also fall within patentable subject matter.
Requirements for Patentability
1. Novelty
The invention must be new, it should not have been disclosed anywhere in the world before the filing date.
How novelty is assessed:
- Search existing patents, published papers, and public disclosures
- Compare against “prior art” (everything publicly known before your filing date)
- If any prior art describes the same invention, it lacks novelty
Tip: Do not publicly disclose your invention (publish, present, sell) before filing a patent. Public disclosure destroys novelty.
2. Inventive Step (Non-Obviousness)
The invention must not be obvious to a person skilled in the relevant field.
How inventive step is assessed:
- Would a skilled person find the invention obvious based on existing knowledge?
- Does the invention solve a long-standing problem in a non-obvious way?
- Does the invention produce a surprising or unexpected result?
Example:
- Combining two known medicines is usually obvious (not patentable)
- Discovering that a known medicine treats a new disease in a surprising way may be patentable
3. Industrial Applicability
The invention must be capable of being made or used in some kind of industry.
This includes:
- Manufacturing processes
- Chemical processes
- Software with a technical application
- Agricultural processes
- Pharmaceutical products
This excludes:
- Pure scientific theories
- Abstract mathematical methods
- Mental acts or games
The Patent Filing Process
Overview of the Complete Process
Step 1: Prior Art Search ............ 1-2 weeks
Step 2: Provisional Filing .......... 1-2 weeks preparation
Step 3: Complete Specification ...... 6-12 months (if filing provisionally first)
Step 4: Publication ................. 18 months from priority date
Step 5: Request for Examination ..... Can be done anytime after publication
Step 6: Examination ................. 6-18 months after request
Step 7: First Examination Report .... Issued by examiner
Step 8: Response to Report .......... 6 months (extendable)
Step 9: Hearing (if needed) ......... Variable
Step 10: Grant ...................... After examination is satisfied
Step 11: Certificate Issued ......... Within 1-2 months of grantTotal timeline (provisional path): 24-36 months Total timeline (direct complete filing): 36-48 months
Step 1: Prior Art Search
Before filing, conduct a comprehensive search of existing patents and publications to:
- Assess the novelty of your invention
- Identify potential conflicts
- Refine your patent claims
- Understand the competitive landscape
Where to search:
- Indian Patents Database: ipindia.gov.in
- WIPO Patentscope: patentscope.wipo.int
- USPTO Patent Database: uspto.gov
- Google Patents: patents.google.com
Cost of professional search: INR 5,000 – 25,000
Step 2: Prepare the Patent Specification
The patent specification is the core document that describes your invention in detail. It includes:
Sections of a Patent Specification:
- Title: Brief name of the invention
- Technical Field: The field of technology the invention belongs to
- Background: Existing technology and its limitations
- Summary: Overview of what the invention does
- Detailed Description: Complete explanation of how the invention works
- Claims: Legal definition of what is being protected (most important section)
- Abstract: Brief summary (150-200 words)
- Drawings: Illustrations of the invention (if applicable)
Quality of specification matters: A poorly drafted specification with vague claims can result in a weak patent that is difficult to enforce.
Step 3: File the Application
You can file as:
- Provisional application: Contains basic details, gives 12 months to file complete specification
- Complete application: Full specification with all claims and drawings
Filing modes:
- Ordinary application: First filing in India
- PCT application: International filing (within 12 months of first filing)
- Convention application: Claims priority from a foreign filing (Paris Convention, 12 months)
Step 4: Publication
Your patent application is published in the Official Journal 18 months from the priority date (filing date or claimed priority date).
After publication, anyone can inspect your application and oppose it within the prescribed period.
Step 5: Request for Examination
Publication does not automatically trigger examination. You must file a separate request for examination within 48 months from the priority date.
Examination fee:
- Individual: INR 2,500
- Company: INR 5,000
Step 6: Examination by the Patent Office
The patent examiner reviews your application for:
- Novelty
- Inventive step
- Industrial applicability
- Patentable subject matter
- Completeness of specification
Step 7: First Examination Report (FER)
The examiner issues a First Examination Report that may include:
- No objections: Application proceeds to grant
- Objections: You must respond with amendments/arguments within 6 months (extendable by 3 months)
- Split directions: Some claims accepted, others objected
Step 8: Response to Examination Report
Similar to trademark objections, you respond to patent examination objections:
- Address each objection point-by-point
- Amend claims if needed (without broadening beyond the original disclosure)
- Provide arguments and evidence
You can file multiple responses until all objections are resolved or the application is refused.
Step 9: Hearing
If the examiner is not satisfied with your written response, a hearing may be scheduled. You (or your patent attorney) present oral arguments before the examiner.
Step 10: Grant
If the examiner is satisfied, the patent is granted and a patent certificate is issued.
Step 11: Annual Maintenance Fees
To keep the patent alive, you must pay annual maintenance fees (annuities):
| Year | Fee (INR) |
|---|---|
| 1-3 years | INR 800 per year |
| 4-6 years | INR 1,500 per year |
| 7-10 years | INR 3,000 per year |
| 11-15 years | INR 7,500 per year |
| 16-20 years | INR 11,000 per year |
Total maintenance cost over 20 years: Approximately INR 1,50,000 – 2,00,000 per claim
Provisional vs Complete Patent Application
| Feature | Provisional Application | Complete Application |
|---|---|---|
| Purpose | Establish early filing date | Full patent specification |
| Content | Basic description of invention | Complete specification with claims |
| Timeline to file complete | 12 months | No separate timeline |
| Cost | Lower (INR 1,600-8,000) | Higher (INR 4,000-20,000+) |
| Patent granted? | No, priority document only | Yes, if approved |
| Priority date | Yes | Yes |
When to file provisional:
- Invention is still being developed
- Need to establish priority before public disclosure
- Testing market viability before full investment
- Need a filing date for investor presentations
When to file complete directly:
- Invention is fully developed
- All technical details are finalized
- Ready for full patent protection
Patent Filing Costs
Government Fees
| Application Type | Individual | Company |
|---|---|---|
| Provisional filing | INR 1,600 | INR 4,000 |
| Complete filing | INR 4,000 | INR 10,000 |
| Request for examination | INR 2,500 | INR 5,000 |
| Annual maintenance (Year 1-3) | INR 800/year | INR 800/year |
| Annual maintenance (Year 4-6) | INR 1,500/year | INR 1,500/year |
| Annual maintenance (Year 7-10) | INR 3,000/year | INR 3,000/year |
Professional Fees (Patent Attorney)
| Service | Fee (INR) |
|---|---|
| Prior art search | 5,000 – 25,000 |
| Provisional specification drafting | 15,000 – 50,000 |
| Complete specification drafting | 25,000 – 1,00,000+ |
| Filing and prosecution | 10,000 – 30,000 |
| Response to examination report | 15,000 – 50,000 |
| Hearing representation | 20,000 – 75,000 |
Total Estimated Cost
| Scenario | Total Cost (INR) |
|---|---|
| Simple patent, DIY | 5,000 – 15,000 |
| Simple patent, with attorney | 50,000 – 1,00,000 |
| Complex patent (pharma/software), with attorney | 1,00,000 – 3,00,000+ |
| PCT international filing | 50,000 – 2,00,000+ (per country) |
FAQs
20 years from the filing date for utility patents. After 20 years, the invention enters the public domain.
Not mandatory, but highly recommended. Patent specification drafting is a specialized skill. A poorly drafted patent can be worthless even if granted.
No. You must have a concrete, workable invention. Abstract ideas, theories, and concepts cannot be patented.
India is a member of the PCT (Patent Cooperation Treaty). You can file a PCT application and enter the Indian national phase within 31 months.
You can file a patent infringement suit in court. Remedies include injunctions, damages, and account of profits.
Yes. Patents are intellectual property assets that can be sold, licensed, or assigned. This is called “technology transfer.
A temporary patent application that establishes an early filing date and gives you 12 months to file the complete specification. Learn more about how to file a patent.
Is a Patent Right for You?
Patents are powerful but expensive and time-consuming. Consider a patent if:
- Your invention is unique and commercially valuable
- Competitors could easily copy your invention
- You have the budget for filing and maintenance (INR 50,000 – 3,00,000+)
- You plan to manufacture, license, or sell the invention
Consider alternatives if:
- Your invention is easily reverse-engineered
- The product lifecycle is shorter than 3-4 years (patent takes 3-4 years to grant)
- You can maintain the invention as a trade secret (e.g., Coca-Cola formula)
Consult our patent attorneys to assess your invention’s patentability
