Vacuum pump control apparatus for an evacuating type waste water collecting system
CA 2030869 C · Owner: Ushitora, Akihiro · Inventors: Asanagi, Tsuneo; Yamaguchi, Kazuo; Ushitora, Akihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vacuum pump control apparatus for an evacuating type waste water collecting system is disclosed. In the system, waste water discharged from houses and facilities is collected into a water collecting tank by means of vacuum sewer pipes provided with a negative pressure therein and the waste water collected in the water collecting tank is discharged by means of a booster pump while the air in the water collecting tank is discharged by means of a vacuum pump. The vacuum pump control apparatus comprises gas-liquid ratio detection means for detecting the ratio of the amount of air to the amount of waste water to be collected into the water collecting tank; and control means for controlling the …
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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 26, 1990 and granted July 8, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 26, 2012.
- 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.