Three-stage gas pressure regulator
CA 2136699 C · Owner: Gfi Control Systems, Inc. · Inventors: Carter, Stephen A.; Knappers, Michael A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a supplementary pressure regulator that can be used with conventional single or multi-stage pressure regulators. It may also conveniently be used with a novel two stage balanced pressure regulator to form a three-stage vacuum demand pressure regulation system which may be used to regulate the pressure of compressed gases used as fuel in engines such as natural gas used in natural gas powered vehicles. The pressure regulator of the presentinvention is a robust compact, high flow, low droop , low pressure drop low set-point drift and low creep regulator which is suitable for both OEM and after market use. It is particularly useful in monobi-, and dual fuel …
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 November 25, 1994 and granted September 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 25, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 25, 2016.
- 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.