Vacuum circuit interrupter contacts containing chromium dispersions
CA 1333014 C · Owner: Cherry, Sidney John · Inventors: Iyer, Natraj Chandrasekar; Gainer, Robert Elfred; Cherry, Sidney John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A powdered metallurgical procedure for forming chromium copper contacts used in vacuum circuit interrupters, in which prealloyed powder formed by mixing to copper chromium of between two to thirty-seven weight percent is rapidly solidified after melting at about 1100°C to 1500°C. This powder may be blended with additional chromium of between 12 to 50 weight percent with a maximum of fiftyfive weight percent of chromium in the final contact structure. This blended mixture may then be either (i) cold pressed at 100,000 psig. and vacuum sintered at 800° to 1400°C; or (ii) be subjected to hot isostatic pressure of 10,000 to 30,000 psig. at between 700°C to 1080°C; or (iii) containing the …
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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 November 15, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 15, 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
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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.