Gray scale printing using spatial light modulators
CA 2118729 C · Owner: Venkateswar, Vadlammanti · Inventors: St. Clair, James; Venkateswar, Vadlammanti; Nelson, William E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for gray scale printing combining row integration and pulse width modulation. A spatial light modulator has one line designated to perform PWM within a, given line time. Another area of the modulator has lines designated to perform row, integration on the print image, allowing for more gray levels. An additional area can be, designated to correct for defects in the illumination profile and the printed images.
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
- Filed March 10, 1994 and granted September 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 10, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2016.
- 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.