Screw joint coupling for oil pipes
CA 1269684 C · Owner: Yasuoka, Hidenori · Inventors: Ueki, Mikio; Sato, Toshio; Yasuoka, Hidenori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A basic structure of a screw joint coupling for oil pipes according to the invention is that a main sealing portion is constructed with a sealing portion which is formed axially in convex at an end of a male screw, and with a sealing portion which is formed in taper at an inner side of a female screw and that the male screw and the female screw are butted at an end point of the former and an end part of a stopper formed at an inner side of the latter. The main sealing portion has a shrinking margin .DELTA.D of the seal part which is regulated in, size in a relation between a shrinking margin .DELTA.d of the screw and a pressure P of the sealing part. Further respective sizes, are regulated …
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 May 29, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 29, 2007.
- 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.