Interlayer structure for laminated glass
CA 2309537 A1 · Owner: Klafka, Guenter · Inventors: Klafka, Guenter; Weimer, Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a multilayer aligned interlocked polyvinyl butryal composite structure which has good properties as a component in glass laminate structures, especially in those structures needing thick (greater than 0.76 mm) interlayers of PVB. The multilayer structures is produced by a process which uses two or more rollers containing plasticized PVB sheeting which are aligned and interlocked by simultaneous unwinding of the layers at set line speeds, temperatures and unwinding tensions.
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 11, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 11, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 11, 2020.
- 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.