Patent offices in India

There are four patent offices in India located at New Delhi, Mumbai, Chennai and Kolkata and depending upon territorial jurisdiction where the Applicant is located, the application has to be filed. In respect of a foreign applicant the application has to be filed before the patent office within whose territorial jurisdiction the agent/ attorney for applicant is located. Even if there is change in attorney in respect of any application for foreign application in India, any divisional Application must be filed within the same patent office where the patent Application was filed.