Protected optical disk of welded construction
CA 1249058 A · Owner: Alcatel Thomson Gigadisc · Inventors: Lange, Francois
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A protected optical disk of welded construction comprises a housing the diameter of which is its largest dimension. The housing consists of parts fabricated from a thermoplastic material joined together by at least one circular weld which occupies part of a plane annular joining area perpendicular to the axis of rotation of the disk. An internal chamber is bordered radially by this joining area. An information carrying layer is contained in this chamber. A pair of grooves lies one on either side of the portion of each of the parts included in the weld and there is a circularly disposed sharp edged projection between the grooves of each pair. In this way the grooves and the projection form 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 January 17, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 17, 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.