Infrared hookswitch for a telephone
CA 1280229 C · Owner: Northern Telecom Limited · Inventors: Wakim, Michael Jamil
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure The present invention discloses an optical hookswitch assembly useable on a telephone set as an optical communications port. The hookswitch assembly is comprised of light emitting and detecting means so disposed in the telephone so as to detect the presence of a handset. Processor means connectable to telephone circuitry means and the light emitting and detecting means is provided such that the telephone circuitry means is activated by the processor means when the light emitting and detecting fails to detect the presence of a handset. The light emitting and detecting means is useable as an optical communications port for accessing the processor means by allowing …
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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 February 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 2008.
- 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.