Polymer impregnation process
CA 2477711 A1 · Owner: Emery, Clair John · Inventors: Emery, Clair John; Shields, Charles Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for impregnating a paper web with a molten polymer to produce a paper with improved resistance to oil and grease are provided. The device includes as part of an on-machine process, an ordinary paper web (10) composed of cellulose or synthetic fibers, a polymer applicator (16) a hot reel (23), and , a winding reel (26). The web which is created through a series polymer onto the surface of the web. The web is next transferred to a hot reel which , maintains the temperature of the molten polymer above its melting point and thereby facilitates wicking of the molten polymer into the web. After the web passes the hot reel, it is wound onto a winding reel where additional wicking , …
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
- Filed March 26, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 26, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2025.
- 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.