Date of Basic Application

Date Published

The date of the basic application stated on the patent request should be taken as correct, unless there is evidence on file to the contrary.  In this case, examiners should object that the date shown on the request is prima facie incorrect.

In certain circumstances, a basic application can have an effective filing date different from the actual filing date (ante-dating and post-dating). However, when this is the case, there must be supporting documentation.


  • La Soudure Electrique Autogene S.A.'s Application (1939) 56 RPC 218; and
  • Poly-Resin Products Ltd.'s Application (1961) RPC 228.