logo

For the Inventor, By the Inventor

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.:

US 4051407 B1

PDFFull Text
Date of Patent:
Sep. 27, 1977

Filed:

Mar. 19, 1976

Arrangement including a gas and/or vapor discharge lamp

Applicant:
Inventors:

Jan Evert van der Werf, Eindhoven, NL;

Jean Johan Heuvelmans, Eindhoven, NL;

Hendricus Franciscus VAN Tongeren, Eindhoven, NL;

Assignee:

U.S. Philips Corporation, New York, NY (US);

Attorneys:

Trifari; Frank R.

Franzblau; Bernard

Primary Examiner:

Eugene R LaRoche

Int. Cl.
CPC ...
H05B / ; H05B / ;
U.S. Cl.
CPC ...
315106 ; 315 98 ; 315107 ; 315260 ; 315307 ; 315334 ; 315D / ; 315D / ;
Abstract

A device for operating a low-pressure sodium vapor discharge lamp without a ballast. The electrode voltage drop near a main electrode of the sodium lamp is influenced by a change in the pre-heating current of that electrode and/or a change in the effective area of the electrode. The changed electrode voltage drop thus obtained provides a mechanism whereby any changes in the lamp current are opposed so as to produce ballast-free lamp operation.

Find Patent Forward Citations

van der Werf, Jan. (1977). Arrangement including a gas and/or vapor discharge lamp (U.S. Patent No. 4051407). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4051407

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Loading…