Expired Canadian patentCanada
Antistatic hairbrush filament
CA 1248721 A · Owner: E. I. Du Pont De Nemours And Company · Inventors: Bond, William B.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Antistatic hairbrush bristle having a nylon or polyester core and a compatible polymeric sheath containing carbon.
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 January 17, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 17, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 18, 1985
GrantedJanuary 17, 1989
Term endedJanuary 17, 2006
Patent numberCA 1248721 A
Classification (IPC)D01F8/04 +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.