Polyethylene heat-shrinkable article formed by irradiating and stretching gelled extrudate
CA 1264045 C · Owner: Dsm N.V. · Inventors: Lemstra, Pieter J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Heat shrinkable material obtained by a) thermoreversible gelation of a solution of a linear polyethylene having a weight-average molecular weight of at least 4 x 105 to form a gel material having virtually the same composition as the solution started from, and, b) irradiation of said gel material with simultaneous or subsequent stretching at a stretch ratio of at least 15. Specifically claimed are articles such as fabrics woven from, fibres, and tubes or tapes having an extremely high shrink ratio upon heating.
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 December 27, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 27, 2006.
- 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.