Newsprint
CA 2006362 C · Owner: Ishiguro, Takeshi · Inventors: Nishikubo, Toshifumi; Shimizu, Ippei; Ishiguro, Takeshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A new newsprint for the newspaper press using cold-set ink is disclosed. The newsprint comprises a base stack composed mainly of mechanical pulp and a coating layer comprising up to 30% of a needle form pigment. The average oil absorptiveness of the pigments in the coating layer should be greater than 65 cc/100g. The newsprint is especially useful for high quality multicolor printing on the high speed web-fed presses using cold-set ink and is characterized by an improved reproducibility of dots and sharpness of print pattern compared with usual newsprint.
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 December 21, 1989 and granted March 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 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.