Expired Canadian patentCanada
Highly orientable iron particles
CA 1162052 A · Owner: Ampex Corporation · Inventors: Kahan, Hillard M.; Stafford, Michael K.; Acebo, William F.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Highly orientable acicular iron particles are made by reducing an acicular ferric oxide which has been coated with sodium tripolyphosphate.
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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 February 14, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 14, 2001.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 22, 1981
GrantedFebruary 14, 1984
Term endedFebruary 14, 2001
Patent numberCA 1162052 A
Classification (IPC)B22F9/22 +2 more
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.