Valve, liquid container using same, recording head cartridge having liquid container and recording apparatus using liquid container
CA 2291998 C · Owner: Canon Kabushiki Kaisha · Inventors: Ujita, Toshihiko; Nakajima, Kazuhiro; Murakami, Shuichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A valve mechanism includes a supporting member having an opening for communication between separated spaces; a thin film covering the opening of the supporting member; a confining member for confining a part of the thin film on the supporting member.
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 February 22, 1993 and granted September 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 22, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 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.