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:
Apr. 06, 1993
Filed:
Dec. 24, 1990
Applicant:
Inventors:
Kirk M Sinclair, Lively, CA;
John R England, Sudbury, CA;
Assignee:
Inco Limited, Toronto, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ;
U.S. Cl.
CPC ...
175213 ; 175215 ; 175324 ; 1753253 ;
Abstract
A dry, vertical shaft drilling system including an inverted raiseboring cutterhead fitted with air nozzles and vacuum pickups. Weights are detachably stacked above the cutterhead. Cuttings are extracted through the weights into a swivel circumscribing the drill string. The swivel is a transition from the rotating cutterhead to the stationary extraction riser pipes disposed above the swivel. Non-rotating stabilizers stabilize the drill string.