Expired Canadian patentCanada
Aqueous lubricant for use in hot rolling of stainless steel
CA 2079336 C · Owner: Nisshin Steel Co. Ltd. · Inventors: Shinoda, Ken-Ichi; Hachiya, Seio; Higo, Yuichi
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
23, An aqueous lubricant for use in hot rolling of stainless steel to prevent roll scoring which comprises a viscous aqueous having dispersed therein from 1 to 30 % by weight of iron oxide powder.
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 28, 1990 and granted April 20, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2012.
- 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 28, 1990
GrantedApril 20, 1999
Term endedMarch 28, 2010
Patent numberCA 2079336 C
Classification (IPC)C10M173/02 +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.