Expired Canadian patentCanada
Digester heating and temperature controlling apparatus
CA 442425 A · Owner: Aktiebolaget Karlstads Mekaniska Wekstad · Inventors: Johan Christopher Fredrik Carl Richter
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 June 24, 1947. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 24, 1964.
- 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—
GrantedJune 24, 1947
Term endedJune 24, 1964
Patent numberCA 442425 A
Classification (IPC)D21C7/14
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.