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:
Feb. 02, 1993
Filed:
Sep. 17, 1991
Applicant:
Inventor:
Joseph F Dickson, Jefferson, MA (US);
Assignee:
Quamco, Inc., Holden, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21H / ;
U.S. Cl.
CPC ...
72469 ; 72 88 ; 72103 ;
Abstract
A seamless helical thread is formed through the use of a die having a thread profile defining groove which undergoes a smooth transition from a pointed form at the starting end to a finish form. The transition occurs along the portion of the groove length where the groove depth is increasing. In the case of a typical machine screw with a 60.degree. finish form, the pointed form is approximately 98.degree..