Electro-optical device
CA 1253963 A · Owner: N.V. Philips'Gloeilampenfabrieken · Inventors: Van Rosmalen, Gerard E.; Gijzen, Wilhelmus A.H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
22, ABSTRACT, "Electro-optical device" The invention relates to an electro-optical device for recording and/or reading recording tracks in a recording surface of an optically readable disk having a plane surface (11) by means of a radiation beam, comprising a frame (43) a turntable support-, ing means (45) for a turntable (55) which is rotatable about an axis of rotation (57), an objective supporting means for an objective (15) having an optical axis (24), a focussing actuator (24) for moving the objective along the optical axis guide means for, moving the objective and/or the turntable relative to each other between a first position, in which they are situated nearer each other, and 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 May 9, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 9, 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.