Process for preparing heat shrinkable polyethylene film
CA 1294101 C · Owner: Sakamoto, Yoshihiro · Inventors: Isozaki, Hideo; Sakamoto, Yoshihiro; Mizutani, Tomoji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing a heat shrinkable ethylene polymer film by expansion and extension of the tube under particular conditions for heating the expanding tube. The heat schrinkable film obtained according to the present invention has little variation in thickness, is low in heat schrinkability at low temperature and is excellent in transparency.
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 January 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 14, 2009.
- 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.