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:
May. 30, 1995
Filed:
Mar. 29, 1993
K Lynn Niehaus, Manchester, MI (US);
Kevin L Newcomer, Monroe, MI (US);
QED Environmental Systems, Inc., Ann Arbor, MI (US);
Abstract
A counting apparatus which is designed to be placed in parallel to a fluid flow line has a differential pressure switch which is placed across an orifice positioned within the fluid flow line. A counting mechanism is associated with the differential pressure switch to register a count when signaled by the differential pressure switch. The differential pressure switch is operable to react to the difference in pressure across the orifice to signal the counter to register a count. The orifice can be a fixed or a variable orifice. In another embodiment of the invention, a fixed or variable orifice is placed within the diaphragm of a diaphragm type differential pressure switch to adapt the differential pressure switch to be placed in series with the fluid flow line rather than in parallel to it.