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. 10, 1992
Filed:
Apr. 23, 1991
Brent English, Eau Claire, WI (US);
Board of Regents of the University of Wisconsin System (UW -Stout), Menomonie, WI (US);
Abstract
A tamper-evident end closure for dispensers, including a hermetically sea base, a rotor having a normally occurring unrestrained non-flat shape, and a rotatable connection between the rotor and the base to hold the rotor on the base in a substantially flat condition so it can rotate. The rotatable connection is achieved by employing an annular attachment ring, formed on the rotor snap-fit into an annular groove molded into the base. The annular attachment ring is connected to the rotor by a frangible web, which will break or tear when an attempt is made to separate the rotor from the base. Because the rotor is formed with a normally occurring non-flat shape, tearing or breaking of the frangible web will allow a portion of the rotor, normally held by the attachment ring, to spring or bend toward its natural shape. This unrestrained portion provides striking evidence of the tampering attempt.