Expired Canadian patentCanada
Heat exchanging apparatus
CA 315744 A · Owner: The Shaw-Perkins Manufacturing Company · Inventors: Archibald H. Davis, Jr.
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 September 29, 1931. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 29, 1948.
- 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—
GrantedSeptember 29, 1931
Term endedSeptember 29, 1948
Patent numberCA 315744 A
Classification (IPC)F28F7/00 +1 more
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.