Closing and injection valve
CA 1293493 C · Owner: Albrigtsen, Rolf H. · Inventors: Albrigtsen, Rolf H.; Samuelsen, Per R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A valve for shutting off or closing a main fluid flow comprises a valve stem (28) having a valve head (48) which, may engage a valve seat (18). At the end remote from the valve head the valve stem carries a piston (36) which can, be actuated by a closing fluid to shut off the main fluid flow. The valve is characterized in that the valve stem (28) is hollow and at the end at which the valve head (48) is provided, is open, and at the opposite end has openings (46) opening into the interior of the hollow valve stem (28) and that the piston (36) is mounted for axial movement on the valve stem (28) to allow further movement towards the valve seat (18) against spring action when the valve head …
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 December 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 24, 2008.
- 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.