Patent applications under the Patents Act, 1970 at the Patent Office, Kolkata
Inventors, startups and manufacturers in Kolkata file with the Patent Office in Salt Lake, the office whose jurisdiction covers West Bengal. We run the invention review, drafting brief, fee category and deadlines, and the specification is drafted and filed by our registered patent agent partner. CorporateWalla is not itself a patent agent. Professional fee from Rs 17,499 for a provisional filing, excluding GST and official fees.
| Item | Position for a Kolkata applicant |
|---|---|
| Law | Patents Act, 1970 and Patents Rules, 2003 |
| Appropriate office | Patent Office, Kolkata, for applicants resident or carrying on business in West Bengal |
| Address | CP-2, Sector V, Salt Lake City, Kolkata 700091 |
| Kolkata's jurisdiction | The rest of India not assigned to the Delhi, Mumbai and Chennai branches, which includes the eastern and north-eastern states |
| Filing | Online e-filing; Form 1 with Form 2 (provisional or complete) |
| Examination | Form 18 within 31 months of the priority or filing date |
| Official filing fee | Rs 1,600 (individual, startup, small entity, educational institution) or Rs 8,000 |
| Term | 20 years from filing, subject to renewal fees |
Many people assume patents are handled in Delhi. The Patent Office has four locations, and Kolkata is the one not described as a branch: IP India lists the New Delhi, Mumbai and Chennai offices as branches and gives Kolkata jurisdiction over the rest of India. For a West Bengal inventor, that means the Kolkata office in Salt Lake Sector V is the appropriate office for the application.
In practice the location matters less than it used to. Applications are e-filed, and your patent agent attends hearings and correspondence for you. But the appropriate office still has to be identified correctly in Form 1, and it decides where the application is examined and where any hearing is held.
Kolkata's jurisdiction is wider than the city. It also covers the other states not assigned to the Delhi, Mumbai or Chennai branches, so applicants from Bihar, Jharkhand, Odisha and the north-east file with the same office.
| Your situation | Appropriate office |
|---|---|
| Individual inventor living in Kolkata or anywhere in West Bengal | Patent Office, Kolkata |
| Company or LLP with its place of business in West Bengal | Patent Office, Kolkata |
| Invention actually originated at a Kolkata facility, applicant elsewhere in India | Kolkata can be the appropriate office on that basis |
| Joint applicants in different regions | The office for the applicant first named, on any one of the grounds |
| Applicant with no residence or business in India | Based on the address for service in India or the patent agent's place of business |
The tests are residence, domicile, place of business and the place where the invention originated. A Bengaluru-registered startup with an R&D unit in Salt Lake, for example, needs to choose its ground deliberately, because the appropriate office, once fixed, is not ordinarily changed in later proceedings on the application.
Source: IP India, jurisdiction of Patent Offices.
| Right | Office | Note |
|---|---|---|
| Patent | Patent Office, Kolkata, Salt Lake | Inventions: products and processes |
| Design | Patent Office, Kolkata and its branches | Shape and appearance of articles |
| Trademark | Trade Marks Registry, Kolkata, Nizam Palace, A.J.C. Bose Road | Brand names and logos |
| Startup recognition for fee concessions | DPIIT, online | Needed before claiming startup fees in Form 28 |
A product launch usually needs more than one of these. The invention is a patent question, the product name is a trademark question, and startup status is a DPIIT registration in Kolkata question that should be settled before the patent fee is paid.
We go through your disclosure and prototype, flag anything already made public, and decide whether a patentability search is worth running.
A provisional fixes the priority date while development continues; a complete specification is filed when the invention is final.
Our registered patent agent partner drafts the specification and claims from the brief we prepare with you, and you approve the draft.
Form 1, Form 2, Form 3, Form 26 and, where eligible, Form 28 are filed online with Kolkata as the appropriate office. The application number and priority date are issued on filing.
Within 12 months of a provisional, the complete specification follows with Form 5. Form 18, or Form 18A for expedited examination, is filed within 31 months of priority.
After the first examination report the application must be put in order within six months, extendable by three. Any hearing is fixed by the Kolkata office and attended by the patent agent.
| Stage | Time | Depends on |
|---|---|---|
| Invention review and brief | 3 - 5 working days | Quality of the disclosure |
| Provisional drafting and filing | 10 - 15 working days | Drafting rounds with you |
| Complete specification | Within 12 months of the provisional | Development of the invention |
| Publication | 18 months from priority, or earlier on Form 9 | Patent Office |
| Examination and grant | Varies | Form 18 or 18A and objections |
Indicative timelines. Grant depends on the Patent Office's examination and cannot be guaranteed.
| Item (e-filing) | Individual / startup / small entity / educational institution | Others |
|---|---|---|
| Form 1 application | Rs 1,600 | Rs 8,000 |
| Form 9 early publication | Rs 2,500 | Rs 12,500 |
| Form 18 request for examination | Rs 4,000 | Rs 20,000 |
| Form 18A expedited examination | Rs 8,000 | Rs 60,000 |
| Form 28 startup or small-entity status | No fee | Not applicable |
Source: First Schedule, Patents Rules, 2003, as published on ipindia.gov.in. Extra sheets beyond 30 and claims beyond 10 cost more.
| Plan | Professional fee | Covers |
|---|---|---|
| Provisional filing | From Rs 17,499 | Disclosure review, drafting brief, provisional specification by our patent agent partner, Form 1, 3, 26 and 28 filed |
| Complete filing | On quote | Patentability search, complete specification and claims, Form 5 and Form 18 |
| Filing to grant | On quote | Complete filing plus Form 18A where eligible, examination report reply and hearing |
All plans exclude GST. Official Patent Office fees are paid at actuals and shown separately on your invoice.
All fees and charges listed are indicative only and do not constitute a binding offer. Final amounts may vary depending on the volume of work and the complexity involved.
| Applicant | How to claim the reduced fee | Form 18A |
|---|---|---|
| Individual inventor | Applicant details in Form 1 | Only on another Rule 24C ground, such as a female applicant |
| DPIIT-recognised startup | Form 28 with the recognition certificate | Eligible |
| Small entity (MSME) | Form 28 with proof of status | Eligible |
| Educational institution | Applicant details and supporting proof | Only on another Rule 24C ground |
The difference is large. A company outside these categories pays five times the reduced fee on filing and examination. If a Kolkata startup plans to file in a founder's name and move the application to the company later, the fee difference becomes payable on the transfer, so it is usually cleaner to recognise the startup first and file in the company's name with an assignment from the inventors.
| Deadline | Time limit | If missed |
|---|---|---|
| Complete specification after a provisional | 12 months | Application deemed abandoned |
| Form 3 foreign filing statement | 6 months from filing | Ground for objection or revocation |
| Request for examination | 31 months from priority or filing | Treated as withdrawn |
| Putting the application in order | 6 months from the first examination report, extendable by 3 | Treated as abandoned |
| Renewal fee | Every year from the third year | Patent ceases |
| Patent | Design | Trademark | |
|---|---|---|---|
| Protects | How something works | How an article looks | The name or logo |
| Kolkata office | Patent Office, Salt Lake | Patent Office, Salt Lake | Trade Marks Registry, A.J.C. Bose Road |
| Term | 20 years | 10 years, extendable by 5 | 10 years, renewable |
| Novelty needed | Yes, with inventive step | Yes | Distinctiveness, not novelty |
We are a CA and CS practice operating under DSG CORPORATE FINANCIAL ADVISORS LLP from 129A, Bangur Avenue, Block A, Lake Town, Kolkata 700055, and we have supported 2,500+ companies across our practice. Patent drafting, filing and prosecution are handled by our registered patent agent partner; we run the rest of the file.
| Reference | Relevance |
|---|---|
| Patents Act, 1970, Sections 7, 9 and 11B | Application, provisional and complete specification, request for examination |
| Section 3 | Inventions that are not patentable |
| Patents Rules, 2003, Rule 4 | Appropriate office by residence, place of business or origin of invention |
| Rules 24B and 24C | Examination within 31 months and expedited examination |
| First Schedule | Official fees |
Authority sources: Office of the Controller General of Patents, Designs and Trade Marks at ipindia.gov.in, including its jurisdiction and contact pages.
Two engineers in Salt Lake developed a sensor that warns of overheating in transformer panels and had a demonstration booked with a utility in six weeks. They had already registered a private limited company but had not applied for DPIIT recognition. We secured recognition first, took an assignment from both engineers to the company, and our patent agent partner filed a provisional specification with Kolkata as the appropriate office and Form 28 for startup fees. The demonstration went ahead after the priority date was fixed, and the complete specification was diarised for month ten.
Illustrative scenario based on typical file patterns. Not a named client engagement.
Same city: DPIIT Registration in Kolkata, OPC Registration in Kolkata and LLP Registration in Kolkata. Nationally: patent registration, trademark registration and our patent filing guide for India.
The Patent Office, Kolkata, at CP-2, Sector V, Salt Lake City, Kolkata 700091. Its jurisdiction covers the rest of India not assigned to the Delhi, Mumbai and Chennai branches, which includes West Bengal and the eastern and north-eastern states.
No. Applications are e-filed, and correspondence and hearings are handled by the registered patent agent. The Kolkata office still has to be named as the appropriate office where it applies.
The appropriate office can be fixed by the applicant's residence, domicile or place of business, or by the place where the invention actually originated. An invention developed at a Kolkata facility can make Kolkata the appropriate office, but the ground should be chosen with care.
Our professional fee starts at Rs 17,499 plus GST for a provisional filing. Official fees are Rs 1,600 for the application and Rs 4,000 for examination for individuals, startups and small entities, or Rs 8,000 and Rs 20,000 for others.
No. Drafting, filing and prosecution are handled by our registered patent agent partner, authorised through Form 26. CorporateWalla coordinates the invention review, brief, documents, fee category and deadlines.
By holding DPIIT startup recognition and filing Form 28 with the certificate. A small entity under the MSME law claims the same way with proof of status. Form 28 has no fee, and both categories can also request expedited examination in Form 18A.
Yes. An individual inventor pays the reduced fee. Where the invention was made using an institution's resources, its IP policy may require the institution to be the applicant, so check that before filing.
With expedited examination in Form 18A, available to startups and small entities at a fee of Rs 8,000, the examination report is ordinarily issued much sooner than in the normal queue. Grant still depends on the objections raised and your replies.
Trademarks are handled separately by the Trade Marks Registry at Nizam Palace, A.J.C. Bose Road, Kolkata 700020. A product usually needs both: a patent for the invention and a trademark for its name.
The application is treated as withdrawn. That is why we usually file Form 18 together with the complete specification. See our patent registration page for the full deadline table.
Tell us what you need and a real CA calls you back, with no scripts and no transfers. Call 72783 76654. Mon - Sat, 10:00 AM - 7:00 PM IST.
Reviewed by CorporateWalla's CA and CS team · Last Updated 19 October 2026 · · Sources: IP India: jurisdiction of Patent Offices, IP India: contact addresses, IP India: First Schedule fees
Canonical: https://corporatewalla.com/kolkata/patent-registration
