Polytetramethylene ether polyurethane-urea resins
CA 1052940 A · Owner: Ethicon · Inventors: Gilding, Denis K.; Taylor, John A. (Jr.)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, The novel thermoplastic polytetramethylene ether polyurethane-urea elastomers of this invention are prepared by reacting a tetramethylene ether glycol with 4,4'-diphenyl methane diisocyanate to form a polytetramethylene ether polyurethane pre-polymer having a number average molecular weight of from about 2,000 to about 10,000. This pre-polymer is waterextended to form a thermoplastic bio-compatible elastomer having a number average molecular weight of about 50,000 to about 100,000 and a, weight average molecular weight of about 300,000 to about 1,000,000. The elastomer so obtained has a softening point in the range of 127°C.- 149°C. and may be melt extruded without decomposition …
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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 April 17, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 17, 1996.
- 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.