Expired Canadian patentCanada
Solid addition compounds for producing smoke
CA 874889 A · Owner: The Government Of The United States Of America Represented By The Secret Ary Of The Army · Inventors: Alfred F. Tatyrek
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead 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 July 6, 1971. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 6, 1988.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedJuly 6, 1971
Term endedJuly 6, 1988
Patent numberCA 874889 A
Classification (IPC)C01B17/45
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.