Control and display system
CA 1310773 C · Owner: Technomarket, Inc. · Inventors: Beiswenger, John L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A control system comprises a liquid crystal display panel; a light source; light detector means; and means fox directing light through at least a portion of the liquid crystal display panel to the light detector means. Control means are provided for holding the liquid crystal display in generally opaque condition while preferably sequentially momentarily clarifying segments of the portion, whereby momentary sequential, transversely spaced light beams are generated between the light source and the light detector means. Timer and logic means are provided for correlating signals received from the light detector means with generated, individual, spaced light beams that create said signals. …
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 November 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 24, 2009.
- 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.