Conducting material and a method of fabricating thereof
CA 2004231 C · Owner: Fujitsu Limited · Inventors: Abe, Kenichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Vias having virtually no pores are formed in a multilayer ceramic substrate by filling through holes of green sheets with a conducting material consisting of a mixture of copper powder particles and copper oxide powder particles each coated with an organic titanium compound and firing the, green sheets. The conducting material may be obtained by: kneading mixed copper oxide powder particles and copper powder particles with a solution of an organic titanium compound; drying and cracking the kneaded mixed powder particles; classifying the cracked mixed powder particles; and making the classified mixed powder particles spherical. The multilayer ceramic substrate may be used as a printed wiring …
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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 November 30, 1989 and granted August 17, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 2011.
- 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.