Heat recoverable polymeric articles
CA 1237263 A · Owner: Raychem Corporation · Inventors: Siden, Dennis C.; Schott, Brian E.; Ramsey, Edward M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ramsey/Rowlands/Schott/Siden ABSTRACT, Heat recoverable articles prepared from semicrystalline polymers having a glass transition temperatures Tg, above about 25°C exhibit unexpectedly high recovery stress under certain conditions. A preferred method of preparing such a heat recoverable article comprises heating the article above its glass transition temperature Tg, deforming the article while it is above Tg but below the crystalline melting temperature, Tm, and cooling the article to a temperature below Tg while maintaining it in the deformed state.
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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 May 31, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 2005.
- 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.