Elements for recording volume transmission holograms
CA 2032697 A1 · Owner: E. I. Du Pont De Nemours And Company · Inventors: Monroe, Bruce M.; Smothers, William K.; Smothers, William K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An element for recording volume transmission holograms is provided comprising a photopolymerizable layer on a reflective backing. The layer contains (a) a cellulose ester, polystyrene, styrene copolymer or, poly(methyl methacrylate) binder, (b) a liquid monomer and (c) a photoinitiator.
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 December 19, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 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.
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.