Method for making a stamping master for video disc replication
CA 1202122 A · Owner: Energy Conversion Devices, Inc. · Inventors: Strand, David A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed a new and improved method for making a stamping master for video disk replication wherein a film of material which is reversibly convertible between two stable states one, having a high electrical conductivity and the other having a low electrical conductivity is de-, posited on a substrate while in one of the states. The material is then imaged with information in coded form by converting selected areas of the film to the other state in a predetermined pattern corresponding to the coded information. The conversion can be accomplished by light elec-, tromagnetic energy or heat. At this stage an intermediate subassembly, composed of the imaged film on the substrate is, …
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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 March 18, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 18, 2003.
- 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.