Process and device for bonding discs to one another
CA 2206613 C · Owner: Ebisawa, Shouei · Inventors: Ebisawa, Shouei; Yokota, Toshio; Arai, Tetsuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to cement UV radiation-transmitting substrates to one another rapidly and without deformation and to cement them together with high efficiency without melting an aluminum film of an information recording layer a device for bonding discs to one another is provided which has a radiant light source which irradiates the discs with radiant light which contains ultraviolet radiation at least once in a flash. A wavelength selector is placed in the optical path between the radiant light source and the discs at a distance from the discs which transmits the ultraviolet rays and absorbs light in a range of wavelengths which are absorbed by the W radiation-transmitting substrates of the discs. …
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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 May 30, 1997 and granted December 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 30, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 30, 2019.
- 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.