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:
Aug. 25, 1998
Filed:
May. 22, 1997
Applicant:
Inventors:
Gunter Borner, Mulhausen, DE;
Jorg Sopka, Schwetzingen, DE;
Assignee:
ABB Research Ltd., Zurich, CH;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
251324 ; 137560 ;
Abstract
A piston valve for liquids provides potential isolation between an inlet-side and an outlet-side liquid. The piston valve is suitable, in particular, for controlling water-based paints in painting appliances which operate by electrostatic charging. At least one control electrode which is at the electric potential of the liquid present at the outlet of the valve is provided in order to improve the service life of the valve.