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:
Oct. 12, 1993
Filed:
Mar. 20, 1991
David L Sipos, Friendswood, TX (US);
Bowen Tools, Inc., Houston, TX (US);
Abstract
Methods and apparatuses, in one aspect, for detecting and indicating loads and/or forces on tubular strings, e.g. tubing, injected into or withdrawn out of a well by an injector apparatus, the apparatus having, in one embodiment, a single piston acting on a single boot with a chamber therein having a fluid the compression of which in response to a load or a change in load is sensed to indicate the load on the apparatus; the indicator in one embodiment having a spring to add to the weight of the injector apparatus to provide a positive pre-load so that negative loads can be determined by a change in positive pressure without requiring negative pressure; and a pressure chamber device for use with such apparatuses and in such methods.