Controlled by-pass for a booster pump
CA 1322740 C · Owner: Morgan, Steven V. · Inventors: Madocks, John E.; Morgan, Steven V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Controlled By-Pass for a Booster Pump, Abstract of the Disclosure A method and apparatus for evacuating an enclosed chamber which utilizes a tandem connection of a booster pump and a mechanical pump in a manner to maximize the rate of evacuation of the chamber but without exceeding the rating of the booster pump and damaging it. A gas bypass around the booster pump is provided with a proportional valve that is operated to start an evacuation of the chamber with the bypass path fully opened but then gradually closing that path in a manner to maintain a differential pressure across the booster pump at a predetermined level, until the bypass path has been fully closed.
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
- Granted October 5, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 5, 2010.
- 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.