Fluid pressure-responsive unit
CA 2032108 C · Owner: Polsky, Betty · Inventors: Polsky, Max
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fluid pressure-responsive unit defining a chamber formed of a base plate, a top plate and a heat-exchange bellows sidewall joining the two plates. Relative movement of the plates is controlled by springs and guiding cylinders within the chamber. The base plate comprises a fluid intake aperture for admitting fluid into the chamber and the latter further contains an overflow assembly including a looped resilient pipe of which one end is connected to the top plate so as to receive fluid overflowing from the chamber and the other end can be connected to another pipe introduced into the chamber by the intake aperture to lead fluid out of the chamber.
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 December 12, 1990 and granted December 6, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 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.