Control cartridge for controlling a safety valve in an operating well
CA 2105526 C · Owner: Geoservices · Inventors: Grudzinski, Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An operating well such as an oil well is provided with a safety valve in the tubing thereof. A control cartridge controls the safety valve under the command of control signals transmitted from the surface. The control cartridge includes a housing mounted in the tubing and a receiver for receiving signals transmitted from the surface. A power supply is provided in the housing and is connected to an electronic control system which control system is also connected to the receiver. A hydraulically operated actuator controls the safety valve and a source of hydraulic fluid is provided in the housing and connected with the hydraulically operated actuator for operating the actuator. The source of …
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 3, 1993 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 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.