Pressure equalizing valve
CA 1105355 A · Owner: Cardi, Paul · Inventors: Cardi, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pressure equalizing valve is disclosed which has a housing defining a chamber. The housing has first and second passages therethrough opening into the chamber. A valve seat in the chamber surrounds the opening of the second passage thereinto. A diaphragm has its periphery sealed to the housing and forms a wall of the chamber adjacent to the valve seat. A spring on the side of the diaphragm opposite the valve seat urges the diaphragm against the seat with a predetermined force, to seal the second passage from the chamber and, hence from the first passage. An indicator is mounted on the housing and has a pressure responsive portion in communication with the chamber for indicating when the …
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 July 21, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 21, 1998.
- 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.