Ink-jet recording medium and ink-jet recording method making use of it
CA 2039271 C · Owner: Kurabayashi, Yutaka · Inventors: Sato, Hiroshi; Kurabayashi, Yutaka; Nagamine, Satoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ink-jet recording medium comprises a substrate and a pigment layer. The pigment layer comprises an upper layer and lower layer. The upper layer contains as a major pigment an aluminum oxide having a specific surface area ranging from 90 m/g to 170 m/g. The lower layer contains as a major pigment an aluminum oxide having a specific surface area smaller than the aluminum oxide in the upper layer an, inorganic pigment selected from a carbonate or silicate of calcium, a carbonate or silicate of magnesium, a silicate of aluminum and hydrotalcite having a specific surface area of not more than 150 m/g, or a basic magnesium carbonate having a specific surface area of not more than 150 m/g.
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 March 27, 1991 and granted April 23, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 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
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.