Expired Canadian patentCanada
Ophthalmic gel
CA 1238278 A · Owner: Chylinski, Victoria S. · Inventors: Trager, Seymour F.; Chylinski, Victoria S.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved injectionable viscoelastic gel for use in ophthalmic surgical and treatment procedures wherein the, gelling agent is a high molecular weight polyacrylamide or polymethacrylamide.
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 June 21, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 21, 2005.
- 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 14, 1984
GrantedJune 21, 1988
Term endedJune 21, 2005
Patent numberCA 1238278 A
Classification (IPC)A61K31/78 +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.