Hydraulic shut-off valve
CA 2105739 A1 · Owner: Bartholomew, Richard Nigel · Inventors: Bartholomew, Richard Nigel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a hydraulic shut-off valve or fuse and includes a housing, spaced fluid line connectors on the housing, a hydraulic fluid passage in the housing between the connectors, a valve in the fluid passage which is adapted automatically to close the passage on a predetermined fluid pressure drop in the passage across it, a secondary fluid passage which bridges the valve and through which a minor stream of fluid can flow from one side of the valve to the other when the valve is closed, means in the housing which is operable from the outside of the housing for locking the valve in its closed position and for closing the secondary fluid passage.
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 September 8, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 8, 2015.
- 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.