Optical disk and optical information processor
CA 1138106 A · Owner: Hitachi, Ltd. · Inventors: Maeda, Takeshi; Shigematsu, Kazuo; Yonezawa, Seiji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Optical disk and optical information processor Abstract of the Disclosure, An optical disk for accumulating information in an optically reproducible form has a line of pits arranged at periodical intervals in an information recording medium on the disk, such pits being so recorded as to wobble minutely in the direction of rotation of the disk.
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 December 21, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 21, 1999.
- 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.