Expired Canadian patentCanada
Dandy roll for manufacturing paper having a twill weave wiremark and related method for papermaking
CA 2050232 C · Owner: The Mead Corporation · Inventors: Waters, James Robert
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Paper having an unique twill weave wiremark produced using a dandy roll in which the outer screen bears has a twill weave; the dandy roll and the papermaking process are also disclosed.
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 August 29, 1991 and granted November 29, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 29, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 29, 1991
GrantedNovember 29, 1994
Term endedAugust 29, 2011
Patent numberCA 2050232 C
Classification (IPC)D21F1/46 +1 more
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.