Electronic dimmer control for vacuum fluorescent display devices
CA 1295656 C · Owner: Ford Motor Company · Inventors: Harris, Richard Bruce
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus and method for setting the pulse width modulation duty cycle that drives a vacuum fluorescent display device in response to changes in the setting of a dimmer control rheostat by establishing a constant window of acceptable voltage references that are changed when the setting of the dimmer control rheostat is changed and by sequentially stepping through a set of discrete voltages whenever the setting of the dimmer control rheostat is changed until one of the discrete voltages is found to lie within the window of reference voltages. A dimmer signal is sent to a display driver circuit that corresponds to the selected discrete voltage lying within the reference window and determines …
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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 11, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 11, 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.