Printed circuit with chromium adhesion layer
CA 1263763 C · Owner: Minnesota Mining And Manufacturing Company · Inventors: Barjesteh, Hamid
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to presensitized circuit material. Currently, the inner layers of multilayer printed circuit boards and flexible printed circuits are manufactured by subtractive etching of large sheets of photoresist-imaged copper clad laminate. This process is costly because of copper waste and problems relating to environmental pollution. Moreover, the circuits resulting from the process are limited by the properties of the laminate and the imaging materials used. Thus there is a, desire in the electronics industry to employ additive electroplating processes whenever possible. This invention provides an article suitable as a presensitized circuit material comprising (1) an …
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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 December 5, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 5, 2006.
- 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.