Maintaining a Patent in Force and Extending the Patent Term
This chapter discusses the maintenance and extension of patent terms. Applicants who receive patents in the countries in which they applied must be aware that these patents do not go on indefinitely. Subject to any extension provisions, these have a fixed legal term that, in most countries, is twenty years from filing as required by the TRIPs Agreement. This means that, if a continuation or continuation-in-part application is filed after that date, the twenty-year term does not run from the filing date of that application, but from that of the parent application. It used to be that refiling an application, by delaying the granting of the patent, extended the patent term, but this is no longer the case. The remainder of the chapter covers renewal fees; the effect of changes in patent term; patent term adjustment in the US; extensions to compensate for regulatory delays; and licences of right.