Multistage tracking system
CA 1263748 C · Owner: Philips Electronics N.V. · Inventors: Jansen, Gerardus Lucien Malhildus; Janssen, Peter Johannes Michiel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multistage tracking system for an optical disk used in recording, storing and transmitting data and the like. The tracking system using a movable sled with objective lens for coarse tracking of individual tracks on the disk and a stationary tilting mirror providing fine tracking on a selected track.
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 5, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 5, 2006.
- 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.