Method of duplicating plastics information carriers, as well as a moulding resin, substrate and die used in said method
CA 1111194 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Dijkstra, Rinse; De Jonge, Jelis; Van Den Broek, Arnoldus J.M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method of reproducing plastics record carriers, in particular duplicating video records. According to the invention a, metal die is used which is provided with a thin-liquid moulding resin of a particular composition which can be polymerized by radiation. A radiation-pervious substrate which is manufactured from synthetic material, for example polymethylmethacrylate is pro-, vided on the moulding resin. The moulding resin is exposed to light via the substrate after which the cured moulding resin together with the substrate connected thereto is removed from the die. The moulding resin used in the process comprises low-molecular monomers or oligomers which contain …
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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 October 20, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 20, 1998.
- 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.