Microcomputer controlled display backlight
CA 1306505 C · Owner: Nelson, Leonard Edward · Inventors: Stair, Mark Timothy; Nelson, Leonard Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for controlling the illumination of a display used to present messages in a pager is described. A microcomputer is used for controlling the operation of the display in response to a read switch being actuated. A light switch, coupled to an illumination circuit provides display illumination upon the light switch being manually activated. The microcomputer also couples to the light switch to allow monitoring of the switch actuation. Upon actuation of the light switch when, a message is being displayed, the microcomputer will maintain the illumination of the display even after, the light switch has been released. Once the message has been-read, the microcomputer resumes monitoring …
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 August 18, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 18, 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.