Process for the production of light resistant polyvinyl butyral foils
CA 1266740 C · Owner: Beckmann, Rolf · Inventors: Beckmann, Rolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It is proposed to add to laminated safety glasses with intermediate layers of polyvinyl butyral foils with contents of phenolic stabilisers and contents of phosphorous acid triesters or phosphonous acid diesters additional UV, absorbers for the removal of yellowing over a longer period of use.
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 13, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 13, 2007.
- 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.