Power operated drill pipe tongs
CA 1062237 A · Owner: Eckel Manufacturing Co. · Inventors: Eckel, Emery L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hydraulically or pneumatically powered drill pipe tongs of the scissors-type used in making up or breaking apart joints of drill pipe or drill collars including an upper tong and a lower tong each including tong die heads for biting into or gripping the upper and lower joints of drill pipe or drill collars with the upper and lower tongs being swivelly connected and being interconnected by a hydraulically or pneumatically powered torqueing piston and cylinder assembly for rotating the upper and lower tongs in relation to each other when making up or breaking apart the drill pipe joints. Each of the upper and lower tongs includes a sliding door having one of the tong die heads thereon that …
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 September 11, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 11, 1996.
- 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.