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:
May. 03, 2016
Filed:
Oct. 21, 2011
Applicants:
Marcus Schwarz, Freiberg, DE;
Ulf Kirsten, Nossen, DE;
Matthias Reich, Freiberg, DE;
Silke Röntzsch, Grossröhrsdorf, DE;
Florian Mertens, Freiberg, DE;
Inventors:
Marcus Schwarz, Freiberg, DE;
Ulf Kirsten, Nossen, DE;
Matthias Reich, Freiberg, DE;
Silke Röntzsch, Grossröhrsdorf, DE;
Florian Mertens, Freiberg, DE;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 4/14 (2006.01); E21B 4/06 (2006.01); F02G 1/043 (2006.01); F01B 11/00 (2006.01);
U.S. Cl.
CPC ...
E21B 4/14 (2013.01); E21B 4/06 (2013.01); F01B 11/00 (2013.01); F02G 1/0435 (2013.01);
Abstract
In a direct drill bit drive for tools for comminuting brittle materials and penetrating into brittle materials by percussive impact on the basis of a heat engine operated with a gaseous working medium, the heat engine is a hot gas engine operating in accordance with a real Stirling cycle process.