Belts for shoe presses
CA 2261504 A1 · Owner: Dutt, William H. · Inventors: Davenport, Francis L.; Dutt, William H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A long nip press belt for a long nip press on a paper machine includes an endless base support substrate a staple fiber batt attached to at least one of the two sides of the endless base support substrate and, polymeric resin materials totally impregnating the fiber/base composite structure comprising the endless base support substrate and the staple fiber batt. A layer of polymeric resin material is built up upon the fiber/base composite structure to a predetermined thickness on each side of the long nip press belt. Once the polymeric resin material is cured, at least the inside surface is ground to a desired smoothness without exposing any fiber on the ground surface.
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 February 12, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 12, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 2021.
- 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.