Camming member for power tongs
CA 2012683 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
A camming member for power tongs is provided comprising a, body including a central opening formed therein the body being, rotatable about a center point within the central opening the, body further including a slot for positioning a tubular member within the central opening, the body further including at least one cam surface adjacent to the central opening the cam surface, being formed such that constant compressional force is applied to the tubular member by jaws urged inward by the cam surface. It is preferable that the body is ring-shaped and is provided with gear teeth radially extending from the outer periphery of the body.
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 March 21, 1990 and granted October 4, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 2012.
- 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.