Magnetic recording medium
CA 1316770 C · Owner: Abe,Chiaki · Inventors: Minami, Takahide; Kanai, Hiroyuki; Suzue, Shigetoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnetic recording medium comprises a support and a magnetic layer, coated on said support comprising, magnetic powder, a binder, (I) an ester compound having the formula:, .....(I), in which R1 and R2 are each a saturated alkyl group having 1 to 25 carbon atoms, branched or straight the total carbon number of R1 and R2 being from 22 to 34, and R3 is a saturated or unsaturated alkyl group having 7 to 29 carbon atoms, branched or straight, and (II) an ester compound having the formula:, .....(II), in which R4 is an aliphatic hydrocarbon group having 1 to 29 carbon atoms, straight or brached and R5, is an aliphatic hydrocarbon group having 1 to 23 carbon atoms, straight or branched, or a …
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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 April 27, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 27, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.