Magnetic recording tape
CA 1065481 A · Owner: Sony Corporation · Inventors: Sato, Motomu; Higuchi, Shigetaka; Ohata, Tsumoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved magnetic recording tape having a dual layer magnetizable coating which provides an improved high frequency response and increased recording sensitivity in the middle and middle-to-high frequency ranges when used in conventional audio recording devices particularly open reel to reel type recorders operated at a tape speed of 19 cm/sec or 38 cm/sec. The dual magnetizable coatings consist of an inner layer of a ferromagnetic iron oxide powder dispersed in a resinous binder and an upper layer of a mixture of ferromagnetic powders in a resinous binder, the mixture including at least ferromagnetic chromium dioxide powder and a ferromagnetic iron oxide powder, both layers having a …
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 October 30, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 30, 1996.
- 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.