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. 28, 1978
Filed:
Jan. 18, 1978
Applicant:
Inventor:
Peter J Gill, Codsall, Wolverhampton, GB;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23G / ; B21K / ;
U.S. Cl.
CPC ...
10-7 ; 10 26 ;
Abstract
A screw having a head and a threaded shank and, in the head, a cruciform shaped recess comprising a central cavity and four grooves radiating from the central cavity at 90.degree. angular spacings, the bases of the grooves lying on a conical (or pyramidal) surface and wherein the included angle at the vertex of such cone (or pyramid) has a value within the range 40.degree. - 45.degree., the preferred value being 40.degree..