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:
Oct. 16, 2018
Filed:
Jun. 04, 2014
Applicant:
Center Rock Inc., Berlin, PA (US);
Inventor:
Leland H. Lyon, Roanoke, VA (US);
Assignee:
Center Rock, Inc., Berlin, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 4/14 (2006.01);
U.S. Cl.
CPC ...
E21B 4/14 (2013.01);
Abstract
A down-the-hole drill hammer for optimizing air consumption. The down-the-hole drill hammer includes a housing, a backhead connected to the housing, and a pressure control check valve assembly mounted within the housing. The pressure control check valve assembly includes a first check valve and a second check valve. The first check valve controls a flow of working fluid through the backhead. The second check valve is mounted to the first check valve and controls a flow of working fluid through the first check valve.