Valve assembly for inflatable packer
CA 1259909 A · Owner: Weatherford/Lamb, Inc. · Inventors: Stringfellow, William D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fluid is applied under pressure to the inlet port (60) of a valve assembly (10) associated with an inflatable packer. When the pressure reaches a predetermined level the force acting on first piston (20) and transmitted through second piston (30) closing shear, pin (74) and stem (40) is sufficient to break opening shear pin (73) thereby permitting the first piston (20) second piston (30) and stem (40) to move to the right as shown in Figure 1a. A locking ring (41) expands into a cavity (51) in annular gland (50) thereby restricting further movement of the stem (40). Fluid flows through inlet port (60) and outlet port (61) to the inflatable packer. A line connects the inflatable packer to an …
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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 September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 2006.
- 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.