Expired Canadian patentCanada
Biologically compatible tampon contraceptive
CA 1163886 A · Owner: Vli Corporation · Inventors: Dobbie, Thomas A. Jr.; Vorhauer, Bruce W.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A biocompatible nontoxic contraceptive sponge comprising a soft, flexible porous polymeric sponge body, one side of said body having a recess contoured to fit over the os of the cervix is disclosed.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 20, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 20, 2001.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 20, 1980
GrantedMarch 20, 1984
Term endedMarch 20, 2001
Patent numberCA 1163886 A
Classification (IPC)A61F13/20 +2 more
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.