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. 18, 1986
Filed:
Aug. 04, 1983
Applicant:
Inventors:
Gerald D Barth, South Elgin, IL (US);
David P Wagner, Geneva, IL (US);
Assignee:
Illinois Tool Works Inc., Chicago, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16B / ;
U.S. Cl.
CPC ...
411412 ;
Abstract
A screw for soft material having an assymetrical thread form which includes an upper flank comprised of a plurality of continuous helical surfaces. The upper flank surfaces are configured such that a helical protrusion is formed on the upper flank which causes increased friction between the screw and the workpiece only after seating of the screw head has occurred.