Multicolour optical device
CA 1265575 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 multicolour optical device having at least three optically stable states includes a plurality of pairs of associated light sensors and light sources for emitting light of respectively different colours when activated. An optical feedback is established in each pair tending to maintain the light source either in its illuminated or in its extinguished condition. Outputs of the light sources are blended to obtain a composite light signal of a colour in accordance with the conditions of respective light sources. Means are provided for selectively transferring the light sources from one to other of their conditions to thereby change the colour of the composite light signal.
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 February 6, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 6, 2007.
- 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.