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:
Jul. 19, 1983
Filed:
Oct. 22, 1980
Applicant:
Inventor:
Charles L Rassieur, Creve Coeur, MO (US);
Assignee:
Central Mine Equipment Company, St. Louis, MO (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
173163 ; 173152 ; 175122 ; 279121 ;
Abstract
In a rotary drill having a driven rotary table with an axially directed passage through its center of rotation defined by a hollow spindle, a kelly bar, with annular shoulders, extending through the passage and a chuck mounted on the spindle, plungers are mounted for radial movement in the chuck, into and out of engagement with the annular shoulders on the kelly bar, and fingers are mounted to be moved hydraulically axially to engage the plungers and move them radially.
Rassieur, Charles. (1983). Rotary drill with a kelly bar and hydraulic chuck (U.S. Patent No. 4393945). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4393945
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile