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:
Aug. 01, 2000
Filed:
Dec. 23, 1998
Applicant:
Inventors:
Larry L Saunders, Varsailles, KY (US);
Tony R Barnett, Wurtland, KY (US);
Assignee:
Svedala Industries, Inc., Waukesha, WI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175219 ; 175209 ; 52112 ; 521711 ;
Abstract
A viewport is located in the floor of a drill rig operator's cab to enable a rig operator to view drilling operations. As drilling commences, the operator may view the material underlying the rig and make a visual determination that the coal seam has been reached, by identifying that the material has the characteristic black color of the coal. When the coal seam is reached, the drilling operation is then altered accordingly to prevent overdrilling.