Cylindrical threaded connection with uniform interference
CA 1292758 C · Owner: Hydril Company · Inventors: Schwind, Brian E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cylindrical threaded connection in which most of the threads between the slightly tapered pin end and the slightly tapered box end have free running radial clearance therebetween. One or two revolutions of thread near the pin end or near the box opening have reduced root dimension or enlarged crest dimension to provide uniform interference in the last revolution or so of complete connection makeup. This uniformly spreads the load over the axial distance of the interference.
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 3, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 3, 2008.
- 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.