Ink jet cartridge, ink jet head and printer
CA 2274872 C · Owner: Ikeda, Masami · Inventors: Asai, Naohito; Higuma, Masahiko; Abe, Tsutomu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ink jet cartridge includes a first chamber for accommodating a negative pressure producing material and provided with air communication part for communication with ambient air wherein a part of the negative pressure producing material does not contain ink adjacent the air communication part; a second chamber which is substantially closed except for a fine communication part for communication with the first chamber at a position away from the air communication part wherein the second chamber directly accommodates the ink to be supplied to the first chamber.
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 July 21, 1993 and granted November 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 21, 2015.
- 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.