Pulse width modulation greyscale system
CA 1192601 A · Owner: Xerox Corporation · Inventors: Waldron, Brian L.; Mailloux, Louis D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is a one dimensional electronic halftone generating system having a source of digital data representative of pixel greyscale, a counter to store the digital data and pulse producing logic, responsive to the counter to activate a laser modulator in accordance with the digital data representative of each pixel. In particular a six bit data word, represents one of 64 greyscale states for a particular pixel. The pulse producing logic responds to the particular data word to produce a pulse of a given duration or width to drive the laser for a given time period. The duration of the pulse, representing one to 64 states for a given pixel will, produce a given discrete …
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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 August 27, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 27, 2002.
- 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.