End portion-treating method for synthetic resin film and device therefor
CA 1315060 C · Owner: Sakubata, Takashi · Inventors: Hisanaga, Akinori; Sakubata, Takashi; Yoshioka, Tetsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is an end portion-treating method applicable to a process of manufacturing a synthetic resin film by first extruding through a slit die or coating by the use of a coater onto or on a conveyor belt or drum a fluid synthetic resin composition in a smooth layer form and then solidifying it the, improvement wherein a gas is blown at both end portions of the film of a fluid synthetic resin composition extruded onto the surface of a conveyor belt or drum to change the sectional form of both end portions as desired and the device used for carrying out the end portion-treatment described above. According to the invention, a synthetic resin film is obtained without creasing in the process …
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 March 30, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 30, 2010.
- 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.