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:
Jun. 05, 2001
Filed:
Mar. 16, 1999
Applicant:
Inventors:
Zhixin Li, Hudson, NH (US);
Christian Ionescu, Nashua, NH (US);
Assignee:
Ferrofluidics Corporation, Nashua, NH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 3/00 ;
U.S. Cl.
CPC ...
H01F 3/00 ;
Abstract
A solenoid with liquid in the gaps between a moving and stationary element is disclosed that includes a secondary kick-back spring used to overcome the viscosity and surface tension effects of the liquid in the gap during the de-energizing phase of the solenoid action. Various secondary spring designs as well as surface shapes of the butt or plunger ends are possible in order to decrease the contact surface area of the ends of either the moving or stationary elements used in the solenoid and also are also used to decrease the viscosity and surface tension effects of the liquid.