Down-hole mud actuated hammer
CA 2025898 C · Owner: Novatek · Inventors: Xiang-Guang, Yu; Hall, David R.; Pixton, David S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improvements in down-hole mud actuated hammers are disclosed. According to its broadest aspect the invention is a down-hole mud actuated hammer for use in a drill string, which includes a housing (1) with an upper end having means for connecting to the drill string. A throat (3) is located within the housing (1) which throat includes a main flow passage (61) to allow high pressure drilling mud to pass therethrough. A piston (2) is provided which is adapted to move axially within the housing means to thereby reciprocate between an up position and a down position. The piston (2) is moved between the up and down position by a minor portion of the high pressure mud which portion passes from …
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 January 22, 1990 and granted April 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2012.
- 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.