Interlocking jaw power tongs
CA 2268058 C · Owner: Buck, David A. · Inventors: Buck, David A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides an improved power tong (1) having a body (2) with a rotating assembly (6). The power tong (1) further has a plurality of jaw members (20, 21 35) positioned within the rotating , assembly (6) with two of the jaw members being pivoting jaws (20, 21) adapted to interlock when in a closed position. In an alternate embodiment, the improved power tong (1) will have a compensating jaw assembly (35, 37) to limit the axial load placed on the tubular member (13) being gripped.
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 October 10, 1997 and granted November 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2019.
- 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.