Joints for high-alloy oil-well tubing with resistance to crevice corrosion
CA 1311779 C · Owner: Miyasaka, Akihiro · Inventors: Miyasaka, Akihiro; Ogawa, Hiroyuki; Inoue, Yasusuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A threaded joint having high crevice-corrosion resistance for oil-well tubing of high-alloy containing not less than 7.5% by weight of Cr, has those parts including the sealing surface, of the joint that are directly exposed to a corroding environment covered with a coating of non-metallic substance 1 to 100 µm in thickness. The coating consists of a single layer or multiple layers of oxide, nitride or carbide ceramics.
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 22, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 22, 2009.
- 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.