Expired Canadian patentCanada
Tobacco sheet reinforced with hardwood pulp
CA 1113231 A · Owner: Amf Incorporated · Inventors: Hoge, William H.; Schmidt, Otto K.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Tobacco is prepared from high solids aqueous slurries incorporating a reinforcing agent constituted by unrefined short cellulose fiber, having an average length of less than 2.0mm.
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 December 1, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 1, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 9, 1979
GrantedDecember 1, 1981
Term endedDecember 1, 1998
Patent numberCA 1113231 A
Classification (IPC)A24B3/14 +2 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.