Method of and apparatus for recording halftone images and halftone images produced thereby
CA 2001261 C · Owner: Dainippon Screen Mfg. Co. Ltd. · Inventors: Kitagawa, Osamu; Sakamoto, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A printed image (It4) is produced with halftone images for respective color printers while so-called rosette moire and a color shift from an original image are prevented. Halftone dots (Hm4, Hc4, Hk4) linear shapes extending in respective prescribed directions thereby forming parallel lines with respective intervals (dm4, dc4, dk4). These extensional directions and intervals of parallel lines are so established that they effectively prevent the rosette moire and the color shift.
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 October 23, 1989 and granted November 15, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2011.
- 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.