Improvements in or relating to processes for preparing substances having vitamin A activity and to products of such processes

Read the whole patent

Listed from its IP Australia record in Patent Yard's archive of Australian patents past their term. Its claims, description and drawings are in the AusPat record and on Google Patents, and the Claude kit works from them.

Why it's free to use

• Filed March 5, 1942. Even if it was granted, its term would have ended by March 5, 1963.
• A pharmaceutical extension adds at most five years, so even that would have ended by March 5, 1968.
• We check Australian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.