Magnetic recording medium
CA 1297738 C · Owner: Sony Corporation · Inventors: Kondo, Hirofumi; Kawana, Takahiro; Yatagai, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is a magnetic recording medium wherein a thin magnetic metal film is formed as the magnetic layer on a non-magnetic base and wherein a carboxylic acid, perfluoroalkyl ester is coated as the lubricant on the thin magnetic metal film used as the magnetic layer to produce the magnetic recording medium exhibiting good running medium exhibiting good running properties, wear resistance and durability under any operating conditions. The carboxylic acid perfluoroalkyl ester employed as the lubricant in the present invention is a compound represented by the general formula RCOO(CH2)jCkF2k+1, wherein R in the general formula stands for a hydrocarbon residue and j<O with k>4.
Read 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 March 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 2009.
- 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.