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:
Jan. 02, 2001
Filed:
Oct. 16, 1998
Applicant:
Inventor:
Mihail S. Moisin, Brookline, MA (US);
Assignee:
Electro-Mag International, Inc., N. Scituate, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F 1/00 ;
U.S. Cl.
CPC ...
G05F 1/00 ;
Abstract
A ballast circuit for energizing a lamp comprises a circuit for limiting and/or regulating signal levels to the lamp. In one embodiment, the ballast comprises a control circuit which regulates the lamp current to a predetermined level such that the ballast can drive lamps having a predetermined diameter, which determines the operating current, and having a length that can vary, which determines the voltage drop across the lamp. In another embodiment, the ballast comprises a threshold circuit for limiting a load current prior to striking the lamp as well as after the lamp conducts current.