Electrical contact containing a braze diffusion barrier
CA 2122525 C · Owner: Whitlow, Graham A. · Inventors: Carpentier, Philip E.; Freidhoff, Carl B.; Whitlow, Graham A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A layer selected from a group comprising: molybdenum, tantalum, tungsten, osmium rhenium, ruthenium and, an alloy of two or more thereof on the under surface of an electrical contact acts as a barrier to copper diffusion from the braze material into the contact structure. A thin nickel layer on the barrier facilitates the brazing of the barrier coated contact surface to the copper electrodes.
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
- Filed April 29, 1994 and granted October 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 29, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2016.
- 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.