Intelligent efficient servo-actuator with dynamic seal for a downhole pulser
CA 2603117 C · Owner: Sawafi Al-Jazeera Oilfield Products And Services Co. Ltd. · Inventors: Pratt, F. Dale; Lambe, Kenneth A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved energy efficient intelligent pulser driver used for generating a mud pulse in a MWD (measurement while drilling) application. In the pulser driver a direct current (DC) powered control circuit activates a three-phase DC brushless reversible rotary electric motor that operates a servo-valve opening of which causes the operation of a main valve to reduce flow area and cause a pressure spike in the mud column. Closing the servo--valve similarly operates the main valve and increases the flow area causing an end to the pressure spike. The servo-valve is powered both in opening and closing operations by a reversible rotary electric motor which in combination with the mechanical …
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 April 6, 2004 and granted July 2, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 6, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 6, 2026.
- 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.