Electrical printed circuit boards
CA 1249187 A · Owner: Bayer Aktiengesellschaft · Inventors: Sirinyan, Kirkor; Von Gizycki, Ulrich; Wolf, Gerhard D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Electrical printed circuit boards, A b s t r a c t Electrical printed circuit boards are obtained in an elegant manner without the usual etching methods and without using bonding agent layers in a wet chemical manner on the basis of the principles of the semi or fully additive technique by using precious metal compounds for activation and base material of a type which has a) a specific total pore volume per unit area of 0.015-0.045 dm3/m2, b) a mean pore diameter of 0.05-5.0 µm and c) a mean pore depth of 0.05-4.0 µm.
Read the whole patent
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 January 24, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 24, 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.