Expired Canadian patentCanada
Spuncast compound lens and method of manufacture
CA 2019685 C · Owner: Hydron Limited · Inventors: Glick, Robert E.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A reproducibly-made, wholly spuncast, non-truncated ballasted compound surfaced soft contact lens and the method of making the same by spincasting a polymer forming monomer mixture.
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
- Filed June 22, 1990 and granted September 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 22, 1990
GrantedSeptember 7, 1999
Term endedJune 22, 2010
Patent numberCA 2019685 C
Classification (IPC)G02C7/04 +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.