Position indicator with light emitter and two light sensors
CA 1263889 C · Owner: Texas Digital Systems, Inc. · Inventors: Havel, Karel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A switching device includes a contact movable between two positions, to selectively open and close an electrical path and a multicolour light emitting diode for indicating different positions of the contact by respectively different colours. The multicolour light emitting diode directs a light beam which is reflected from the contact in accordance with its position on one of two light sensors. The colour of the light beam is controlled in accordance with the outputs of the light sensors.
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
- Granted December 12, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 12, 2006.
- 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.