Process for conversion of polyvinyl butyral (pvb) scrap into processable pellets
CA 2412461 A1 · Owner: E.I. Du Pont De Nemours And Company · Inventors: Hofmann, George Henry
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 polyvinylbutyral (PVB) composition that is useful for blending with other polymers. The PVB composition of the present invention can be stored and used at ambient temperature without the occurrence of blocking by the PVB.
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 August 10, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 10, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 10, 2023.
- 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.