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:
Feb. 06, 2001
Filed:
Jun. 17, 1999
Applicant:
Inventor:
Jerry M. Kramer, Yorktown Heights, NY (US);
Assignee:
Philips Electronics North America Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 4/116 ;
U.S. Cl.
CPC ...
H05B 4/116 ;
Abstract
An apparatus for reducing vertical segregation of a discharge lamp. A current/voltage input sweeps through a frequency range between the first azimuthal acoustic resonance mode and a first radial acoustic resonance mode of the discharge lamp. The current/voltage input is subsequently amplitude modulated. Alternatively, without amplitude modulation, the current/voltage input sweeps through the frequency range for a first portion of the period, and then for a second portion of the period drops to a relatively constant frequency.