Composite paper
CA 2004113 C · Owner: Somar Corporation · Inventors: Tomiki, Masatoshi; Ehara, Ryohei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A composite paper suitable for use as writing paper printing paper or copying paper is disclosed which includes a synthetic resin film having a thickness of 12-30 µm and a paper, sheet laminated on each side of the synthetic resin film and having a Bekk smoothness of 60-120 seconds a density of 0.8-1.0, g/cm3, a degree of sizing of 0.5-1.5 seconds and a thickness of 20-25 µm.
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 November 29, 1989 and granted January 26, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 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.