Scroll type fluid machinery
CA 2043933 C · Owner: Hirano, Takahisa · Inventors: Hirano, Takahisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
According to the present invention, there is provided a scroll type fluid machinery in which a pair of stationary scroll and revolving scroll having spiral elements set up at end plates thereof, respectively are, engaged with each other, and a high pressure fluid chamber is formed on the outside of the end plate of the stationary scroll, characterized in that a low pressure fluid chamber or an intermediate pressure fluid chamber is formed between the end plate of the stationary scroll and the high pressure fluid chamber. As a result, the pressure of a low pressure fluid or an intermediate pressure fluid acts on the outside of the end plate of the stationary scroll. Accordingly there is such …
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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 June 5, 1991 and granted February 13, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 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.