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:
Nov. 11, 1986
Filed:
Nov. 21, 1984
Applicant:
Inventor:
Volker Hentschel, Dorsten, DE;
Assignee:
Hochtief Ag Vorm. Gebruder Helfmann, Essen, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
E21D / ;
U.S. Cl.
CPC ...
405146 ; 405238 ; 405150 ;
Abstract
A tunnel casing is formed by cylindrical casing sections whose proximal flanges are not only bridged by the usual drawbolts tending to pull the casing sections toward one another, seals and centering elements, but also are provided with wedge or hydraulic spacers which can fix the gap widths at the respective joints by hydraulic or wedge blocking to take up pressure forces which cannot be sustained by the drawbolts.
Hentschel, Volker. (1986). Tunnel lining form (U.S. Patent No. 4621948). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4621948
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile