Flame-retardant, high-temperature resistant foams of polyimides
CA 2046090 A1 · Owner: Lenzing Aktiengesellschaft · Inventors: Loy, Walter; Weinrotter, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There are disclosed flame-retardant high-temperature resistant polyimide foams having the general formula, ,(I), The foams have an elevated thermostability and determined in a thermogravimetric analysis at a heating rate of 20 degrees per minute, have a maximum weight loss between 550 and 650°C. The overall weight loss up to a heating temperature of 350°C amounts to less than 3 % by mass.
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 July 2, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 2, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 2, 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.
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.