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:
Mar. 16, 1999
Filed:
Aug. 21, 1997
Hans H Rehbock, Houston, TX (US);
John J Johnson, Houston, TX (US);
Baker Hughes Incorporated, Houston, TX (US);
Abstract
A guide lug for a starting or window mill is provided at the upper end of the whipstock. A back-up shoulder is provided to act against any tendencies of the mill to whirl. A taper is provided for use in guiding the mill toward the casing for the cutting of the window. The lug is configured to be worn by a guide for the window mill or starter mill rather than being milled away. As a result of the use of the lug, the upper sections of the whipstock are protected from the mill. In turn, any holes or other projections provided for subsequent retrieval of the whipstock are functional for such a retrieval at the conclusion of the milling process for the window.