Expired Canadian patentCanada
Glassy oxide network passivation of dichromated gelatin holograms
CA 2046186 C · Owner: Hughes Aircraft Company · Inventors: Knobbe, Edward T.
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 passivated dichromated gelatin film in which the film includes a glassy oxide network to provide passivation and structural strengthening. The glassy oxide network is formed simultaneously with the gelatin formation via a sol-gel process.
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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 July 4, 1991 and granted July 9, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 4, 1991
GrantedJuly 9, 1996
Term endedJuly 4, 2011
Patent numberCA 2046186 C
Classification (IPC)G03C1/66 +1 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.