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:
Apr. 28, 1992
Filed:
Dec. 15, 1989
Jurgen Heider, Munich, DE;
Dieter Lang, Holzkirchen, DE;
Hartmuth L Bastian, Munich, DE;
Stefan Kotter, Munich, DE;
Richard Kotschenreuther, Munich, DE;
Patent Treuhand fur elektrische Gluhlampen m.b.H., Munich, DE;
Abstract
To make a small high-pressure discharge lamp, for example of 50 W rating or less, and suitable, for example, for automotive applications, a quartz glass tube is heated, formed with constrictions, and a gas passed therebetween to expand the portion of the tube between the constrictions into olive shape to form the discharge vessel (6). A preformed first electrode system is introduced through one of the constrictions. The electrode system preferably has a zig-zag lead (9) slightly larger than the internal diameter of the tube to provide for self-centering. The tube is then isolated from atmosphere, for example by being placed in a glove box or coupled to a pumping head (15), for introduction therein of a fill substance, for example in pellet form, of a metal halide and, if desired, mercury; and a fill gas, such as argon or, preferably, xenon, preferably after cleaning and flushing the tube. A second electrode system is then introduced, for example within the glove box, and the end of the tube sealed off, with the fill substance therein. A second pinch seal (18) can then be formed externally of the glove box, or while the tube is still connected to a pumping head, and excess end pieces of the tube and the electrodes are cut off.