Organic materials having meta, para-isopropylidene diphenoxy units, and method
CA 1136329 A · Owner: General Electric Company · Inventors: Keeley, Donald E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Meta,para-isopropylidene bisphenol is homopolymerized and copolymerized to produce a variety of high performance thermoplastics having improved processing characteristics. In addition to polycarbonates, there are provided polyesters poly-, estercarbonates, polyepoxides, polysulfones polyetherimides, polyformals, epoxy resins and polycarbonate-polydiorganosiloxane block polymers.
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 November 23, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 23, 1999.
- 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.