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:
Sep. 04, 1990
Filed:
Jun. 27, 1988
Richard P Dunn, Wichita Falls, TX (US);
The Charles Machine Works, Inc., Perry, OK (US);
Abstract
A method of boring a hole in the earth such as for passing under obstacles, not limited, but including roadways, rivers, dikes, canals or other inexcessible areas where it is impossible to trench a ditch including the steps of advancing a rotating drill string in a direction inclined to the earth's surface to establish a borehole, stopping the rotation and advancement of the drill string, aligning the drill pipe so that the drill bit is inclined at an angle relative to the axis of the drill string towards a new direction desired for the borehole, advancing the drill string and drill bit a short distance without rotation, resuming rotation advancement of the drill string for a short distance, sequentially repeating the steps of advancing the rotationally aligned drill string without rotation to move the drill bit in the newly desired direction, followed by rotation with simultaneous advancement until the new direction of drilling is achieved, after which, until a still different direction is desired, drilling is continued by simultaneously rotating and advancing the drill string.