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. 18, 2010
Filed:
Sep. 02, 2003
Applicants:
Herbert Egli, Zwillikon, CH;
Peter Ellenberger, Feldmeilen, CH;
Inventors:
Herbert Egli, Zwillikon, CH;
Peter Ellenberger, Feldmeilen, CH;
Assignee:
Construction Research & Technology GmbH, Trostberg, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09K 8/06 (2006.01); C09K 8/32 (2006.01); C09K 8/38 (2006.01); E21B 21/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of reducing wear in a cutting head of a tunnel boring machine, by means of the addition at the cutting head of a foamed aqueous liquid composition, which comprises a foaming agent and a lubricant, the lubricant being selected from the group consisting of high molecular weight polyethylene oxides and bentonite. Preferred foaming agents are anionic and nonionic surfactants. Wear rates of cutting elements of TBMs boring in hard rock are considerably reduced. A wear-reducing foamable concentrate is also described.