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. 15, 2009
Filed:
Mar. 05, 2008
Applicant:
David C. Cummings, Crouse, NC (US);
Inventor:
David C. Cummings, Crouse, NC (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01M 11/03 (2006.01); B01D 35/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A filter including a first chamber; a second chamber; a piston having a head portion disposed in the first chamber and a rod portion disposed in the second chamber; a third chamber containing a filter medium, having an inlet communicating with the second chamber and an outlet; first and second conduits supplying fluid under pressure to the first and second chambers, respectively; and a valve in the first conduit operable to direct fluid under pressure to opposite sides of the piston head portion to reciprocate the piston and correspondingly eject fluid in the second chamber through the third chamber.