Method for making optically readable media containing embossed information
CA 2020180 C · Owner: N.V. Philips' Gloeilampenfabrieken · Inventors: Zager, Stephen A.; Shvartsman, Felix P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for making an optically readable medium containing a relief information track comprising the sequential steps of, (a) laminating a dry photohardenable film to a surface of a transparent dimensionally stable substrate; (b) embossing the exposed surface of the photohardenable film with the relief information track by applying thereto under pressure a scamper die containing a reverse relief image of the information track;, (c) passing actinic radiation through the transparent substrate and the photohardenable film to effect hardening of the photohardenable film while it is contact with the stamper die; and, (d) separating the stamper die from the embossed photohardened film;, The …
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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
- Filed June 29, 1990 and granted January 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 29, 2012.
- 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.