Apparatus including electrical contacts
CA 2007578 C · Owner: Holden, Clarence Alexander Jr. · Inventors: Law, Henry Hon; Holden, Clarence Alexander Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrical device is provided which has contacts having regions with a conductive matte-finish metal surface. The matte-finish surface is characterized by having a Knoop hardness number of at least 300 a diffuse reflectance of less than, about 20 percent and a specular reflectance of less than about 2 percent. Thesecontacts have a contact resistance of less than about 50 milliohms under a 50-gram, load, even after exposure to 50°C and 95% relative humidity for a period of 20 days. Reflection electron microscopy shows that particularly advantageous matte-finishsurfaces have sharply peaked asperities with average peak angles of less than about 90 degrees. In one embodiment, the surface is …
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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 January 11, 1990 and granted February 22, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 11, 2012.
- 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.