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:
Oct. 28, 2008
Filed:
Sep. 08, 2006
Leon P. Janik, Suffield, CT (US);
David Ferreira, Glastonbury, CT (US);
Michael J. Williams, Glastonbury, CT (US);
Leon P. Janik, Suffield, CT (US);
David Ferreira, Glastonbury, CT (US);
Michael J. Williams, Glastonbury, CT (US);
Stanadyne Corporation, Windsor, CT (US);
Abstract
A display provides an indication of the remaining useful life of a filter element by providing a visible level of fluid in the display corresponding to the remaining useful life. The fluid level is adjusted by a valve responsive to a pressure differential across the filter element. An increasing pressure differential produces an increased fluid level in the display. The display may be provided with markings indicating that a particular fluid level in the display corresponds to the need to change a filter cartridge containing the filter element.