Expired Canadian patentCanada
Atmospheric suction roll silencer device
CA 584822 A · Owner: Her Majesty The Queen In Right Of Canada, As Represented By The Minist Of National Research Council · Inventors: Thiessen, George J.
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 October 13, 1959. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 13, 1976.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 28, 1957
GrantedOctober 13, 1959
Term endedOctober 13, 1976
Patent numberCA 584822 A
Classification (IPC)D21F1/48
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.