Expired Canadian patentCanada
Air humidity regulator
CA 271237 A · Owner: The National Air Filter Company · Inventors: Hans Edmond Birkholz
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 May 31, 1927. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 1944.
- 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—
GrantedMay 31, 1927
Term endedMay 31, 1944
Patent numberCA 271237 A
Classification (IPC)B01D47/06
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.