Photocurable resin laminate and method for producing printed circuit board by use thereof
CA 2022753 C · Owner: Sato, Jiro · Inventors: Matsuda, Hideki; Mori, Toru; Sato, Jiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A photocurable resin laminate comprising a support and a photocurable resin layer disposed on one surface of said support, said photocurable resin layer having: (a) a viscosity of from 104 to 5 x 105 poises as measured at 90 °C;, (b) a thickness of from 30 to 150 µm; and (c) an ultraviolet ray transmittance of from 40 to 95 % with respect to ultraviolet rays having a wavelength of 365 nm. When this photocurable resin laminate is laminated under pressure on both surfaces of a metal-clad insulting base board having through-holes of an inner diameter smaller than 0.5 mm so that both surfaces of the metal-clad insulating base board are covered with the photocurable layer of the photocurable …
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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 17, 1990 and granted November 12, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 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.