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:
Sep. 10, 1991
Filed:
Jul. 06, 1989
Applicant:
Inventors:
Frank Piacenti, Campbellsville, KY (US);
Steven N Flinchum, Elkhorn, KY (US);
Assignee:
Emhart Inc., Towson, MD (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16B / ;
U.S. Cl.
CPC ...
411387 ; 408224 ;
Abstract
A self-drilling and thread forming fastener for fasting a first softer workpiece, such as wood, to a second harder workpiece, such as metal, is described. The fastener features wings of improved configuration including positive angle of attrack, positive cutting edge relief angles, teardrop-like crescent shape across section and knife-like cutting edge which exhibit faster drill times through wood.