Circuit for controlling thermal heads of printing apparatus
CA 1281765 C · Owner: Hino, Michihiro · Inventors: Hino, Michihiro; Suzuki, Kiyosuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A PWM (Pulse Width Modulation) control circuit for printing apparatus comprises a memory for storing digitalized image data, a main converter connected to the memory for converting upper bits of the digitalized image data onto a main pulse-width modulated signal based on a first unit time duration, a sub-converter connected to the memory for converting the rest of the bits of the digitalized image information into a sub pulse-width modulated signal based on a second unit time duration and a drive circuit connected to the main converter and sub-converter for generating the driving signal in accordance with the main pulse-width modulated signal and sub pulse-width modulated signal. The amount …
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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 March 19, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 19, 2008.
- 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.