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. 18, 2003
Filed:
Aug. 02, 2001
Bruce Weber, Fenton, MO (US);
Paul E. Naslund, St. Louis, MO (US);
Dema Engineering Company, St. Louis, MO (US);
Abstract
This backflow preventer includes a body having an upper portion providing an inlet and a lower portion providing an outlet. The body includes a backflow preventer having a nozzle communicating with the inlet, a passage communicating with the outlet and a diaphragm disposed between the nozzle and the passage. The diaphragm is maintained in the closed position by a resilient element and is movable under inlet water pressure from a closed position to an open position. The diaphragm is moved into the closed position by reverse back-up flow assisted by the resilient element and a relief gap is provided below the diaphragm to permit escape of reverse backflow.