Liquid accommodating container providing negative pressure, manufacturing method for the same, ink jet cartridge having the container and ink jet recording head as a unit, and ink jet recording apparatus
CA 2174285 C · Owner: Sasaki, Toshiaki · Inventors: Sugama, Sadayuki; Okada, Hideo; Sasaki, Toshiaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liquid container includes a substantially prism-like outer wall provided with a substantial air vent portion and having a corner formed by 3 surfaces: an inner wall having outer surfaces equivalent or similar to inside surfaces of said outer wall and a corner corresponding the corner of said outer wall said inner wall defining a liquid accommodating portion for containing liquid therein said inner wall further having a liquid supply portion for supplying the liquid out of said liquid accommodating portion; wherein said inner wall has a thickness which decreases from a central portion of the surfaces of the prism-like shape to the corner and said outer wall and and said inner wall are …
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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 April 16, 1996 and granted July 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 16, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 16, 2018.
- 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.