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, 2011
Filed:
Nov. 08, 2007
Katsuyuki Totsu, Sumida-ku, JP;
Katsuyuki Totsu, Sumida-ku, JP;
Other;
Abstract
A screw which can be manufactured at a low cost with a relatively simple constitution by performing precise machining suitable for tightening a screw without employing a tapping thread structure as a threaded portion shape and machining only the distal end of the threaded portion to have a shape projecting spherically, and which can ensure smooth and quick screw tightening work without causing such problems as heat generation or molding powder at all at screw tightening. The screw includes a head () provided with a bit fitting groove () at one end, and a threaded portion () which is machined precisely with substantially equal circular diameter over a full length, wherein the distal end () of the threaded portion () is shaped to have a spherical projection varying in a plurality of stages.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile