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:
Dec. 27, 1977
Filed:
Mar. 16, 1977
Applicant:
Inventor:
Richard Gerretz, Viersen, DT;
Assignee:
Mannesmann Aktiengesellschaft, Dusseldorf, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
72393 ; 308 / ;
Abstract
The expander is constructed from an irregular, truncated polyhedral pyramid in which surfaces bounded by parallel edges alternate with surfaces of trapezoidal contour. The latter have T-shaped longitudinal grooves each receiving respectively the T-shaped foot portion of double T-contoured guide elements and being secured to the groove from axial ends of the pyramid.