Method for transferring patterns on silicone ladder type resin and etching solution used in such method
CA 2010030 C · Owner: Mitsubishi Denki Kabushiki Kaisha · Inventors: Adachi, Etsushi; Hayashi, Osamu; Adachi, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for transferring patterns on a silicone ladder type resin, which comprises: applying onto a substrate a silicone ladder type resin to be represented by the following general formula (I), (I) (where: R1 denotes a phenyl group or a lower alkyl group and two R1's may be the same or different kinds; R2 denotes hydrogen atom or a lower alkyl group and four, R2's may be the same or different kinds; and n represents an integer of from 5 to 1,000); drying the thus applied resin layer; thereafter applying onto the resin layer a cresol novolac type positive photo-resist; forming a predetermined pattern in the photo-resist layer; subjecting the photo-resist layer to pretreatment; and finally …
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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 February 14, 1990 and granted January 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 14, 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
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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.