The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 21, 1992
Filed:
Nov. 27, 1989
Applicant:
Inventor:
Joerg E Schulze-Beckinghausen, Garbsen, DE;
Assignee:
Weatherford, U.S., Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B25B / ;
U.S. Cl.
CPC ...
81 5716 ; 81 5734 ;
Abstract
Apparatus for connecting and disconnecting threaded members including a power tong, a backup unit disposed below the power tong for gripping a second pipe, and apparatus for transmitting reaction forces generated by the power tong to the backup unit, the backup unit having devices for transmitting compressive or tensile forces between its members from the power tong which, in one embodiment, includes a hydraulic connection between a double acting hydraulic piston and cylinder assemblies incorporated in the members.