Multi-stage gas compressor incorporating bypass valve device
CA 2099989 C · Owner: Matsushita Electric Industrial Co. Ltd. · Inventors: Fujio, Katuharu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multi-stage gas compressor includes a plurality of compression elements which constitute a multi-stage compression mechanism, in which discharge sides of pressure stage compression elements are successively communicated with suction sides of following stage compression elements through respective communication passages so that a discharge side of each lower pressure stage compression element is communicated with a suction side of each higher pressure stage compression element through a communication passage so as to constitute a two-stage compression mechanism. A motor coupled to a drive shaft of the multi-stage compression mechanism is located in a motor chamber within a closed container …
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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 November 10, 1992 and granted March 7, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2014.
- 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.