Laser printer_with parameter switching in accordance with scanning density
CA 2037693 C · Owner: Furuta, Hideki · Inventors: Furuta, Hideki; Matsuura, Tomoyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A laser beam printer which forms a latent electrostatic image on a photoreceptor with a laser beam to perform an image recording operation including, scanning density switching means for selectively switching a scanning density of the laser beam on the photoreceptor within a plurality of values and, parameter switching means for selectively switching a parameter other than the scanning density of the laser beam within a plurality of values in the steps of producing a print. The parameter is, for example a, quantity of the laser beam, a width of the laser beam for one pixel in the main scan direction or the like. A switching operation of the parameter switching means is controlled in …
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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
- Filed March 7, 1991 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 2013.
- 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
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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.