Protect your invention with expert patent legal services in Kolkata. Our patent lawyers handle patent searches, drafting, filing, prosecution, opposition, and infringement litigation at the Indian Patent Office (Kolkata) and courts.
The patent process includes: (1) Prior art search (patentability assessment); (2) Drafting of patent specification (including claims, which define the scope of protection); (3) Filing with the Indian Patent Office (Kolkata is one of four patent offices in India); (4) Publication after 18 months (or earlier on request); (5) Request for examination within 48 months; (6) Responding to examination reports (objections on novelty, inventive step, sufficiency of disclosure); (7) Grant of patent. The process typically takes 2-4 years.
Pre-grant opposition can be filed by any person after publication but before grant, on grounds including lack of novelty, obviousness, and insufficient disclosure. Post-grant opposition can be filed within one year of grant. Patent infringement suits can be filed in the District Court or High Court. Remedies include interim and permanent injunction, damages, account of profits, and delivery-up of infringing articles. The defendant can counter-claim for revocation of the patent.
Prior art search and patentability opinion.
Drafting of patent specification with claims tailored to the invention.
Filing and prosecution of patent applications at the Indian Patent Office.
Filing and defending pre-grant and post-grant patent oppositions.
Patent infringement litigation and defense before District Court and High Court.
Patent annuity payments, assignments, and licensing agreements.
In India, patents follow a first-to-file system. Delay in filing can result in loss of patent rights. Contact our patent lawyers for a confidential consultation.
📞 Call +91 74398 11422An invention that is new, involves an inventive step (not obvious to a person skilled in the art), and is capable of industrial application. Discoveries, scientific theories, mathematical methods, business methods, computer programs per se, and methods of treatment are not patentable under Indian law.
20 years from the date of filing the patent application (or the international filing date for PCT applications). After expiry, the invention enters the public domain.
A provisional specification establishes an early priority date and gives the applicant 12 months to file the complete specification. It is useful when the invention is at an early stage of development but you need to secure priority.
Software per se is not patentable. However, software with a technical effect or contribution (embedded in hardware, improving a technical process) may be patentable. The claims must focus on the technical solution, not the algorithm or business method.
Our experienced patent lawyer in kolkata is ready to assist you. Free initial consultation. Call or WhatsApp us today.