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:
May. 28, 1991
Filed:
Jan. 16, 1990
Uvon Skipper, Bellaire, TX (US);
Other;
Abstract
A milling machine is set forth for operation on a pipe string in a cased well to mill the casing. In one embodiment, an inner mandrel having a shoulder is aligned relative to a set of first cutters which are retracted. They are radially extended through slots in an outer body for cutting operations when the pipe string is rotated. Extension is accomplished by raising pump pressure to move an inner mandrel having a shoulder juxtapositioned relative to the cutters. In an alternate embodiment, the inner mandrel has two shoulders which cooperate with two separate sets of cutters wherein the first set is fully extended and the second set in only partially extended. The coil spring controlling the shoulder for the second set of cutters. The lower end of the tool body includes a constricted outlet orifice for mud flow and an alternate pathway through the inner mandrel and outer body is provided to flush cuttings and chips from the cutters.