Secondary shut off valve for vacuum operated liquid tank and a vacuum operated liquid tank assembly
CA 2357166 A1 · Owner: Landmark Oilfield Rentals & Services Ltd. · Inventors: Mckinney, Reginald David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A secondary shut off valve for a vacuum operated liquid tank includes a vessel having a top end and a divider which divides the vessel into an inlet chamber and an outlet chamber. An inlet extends through the top end of the vessel providing ingress to the inlet chamber. An outlet extends through the top end of the vessel providing egress from the outlet chamber. A fluid passage extends through the divider at the bottom end of the vessel, thereby permitting communication between the inlet chamber and the outlet chamber. A vertically aligned cylindrical body with a cylindrical passage is in communication with the outlet. A sealing seat is positioned at an upper remote end of the passage at …
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 11, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 11, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 11, 2023.
- 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.