Expired Canadian patentCanada
Strand separating device for twisted clothes lines
CA 480596 A · Owner: Douglas Malcolm Mackenzie · Inventors: Douglas Malcolm Mackenzie
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 January 29, 1952. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 29, 1969.
- 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—
GrantedJanuary 29, 1952
Term endedJanuary 29, 1969
Patent numberCA 480596 A
Classification (IPC)A47F
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.