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:
Mar. 11, 1980
Filed:
Aug. 18, 1978
Applicant:
Inventor:
Carlo Grandori, Rome, IT;
Assignee:
The Robbins Company, Seattle, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21D / ; E21D / ;
U.S. Cl.
CPC ...
299 56 ; 299 58 ; 299 90 ;
Abstract
A machine for mechanical tunnel boring, of the rotating cutter head type, comprising a grid rigid with the cutter head, parallel to the theoretical boring surface, provided with a set of void spaces wherefrom the cutting tools slightly project, said void spaces having a size corresponding to the optimum dimensions of the fragment of mined material.