Latch mechanism for use in association with a mechanical drilling jar
CA 2058703 A1 · Owner: Lineham, Donald H. · Inventors: Lineham, Donald H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Latch Mechanism, for use in Association with a Mechanical Drilling Jar, Donald H. Lineham ABSTRACT OF THE DISCLOSURE, A latch mechanism for a mechanical drilling jar has a first latch ring having inclined grooves a, second latch ring also having inclined grooves a, split collet disposed between the first and second latch rings, first and second sets of roller bearings disposed in the inclined grooves between the first latch ring and the split collet and between the second latch ring and the split collet respectively and a, set of Belville springs to maintain pressure on the split collet. The inclined grooves convert the axial compressional force imparted by the Belville springs into …
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 2, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 2, 2014.
- 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.