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. 11, 2007
Filed:
Dec. 07, 2004
Applicants:
John Herbert Harvey, Wolverhampton, GB;
Roger Witton, Wolverhampton, GB;
Inventors:
John Herbert Harvey, Wolverhampton, GB;
Roger Witton, Wolverhampton, GB;
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
F15B 13/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
A tandem hydraulic valve comprising first and second axially aligned valve spools, a valve guide slidably receiving said valve spools to control, in use, the connection between respective ports of the valve guide, said first and second spools being formed as separate components and being axially interconnected, to move in unison, by an axial connection component, and, the interface of said first and second spools being connected to a predefined, external, hydraulic fluid leakage path.