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:
Nov. 25, 1980
Filed:
Sep. 17, 1979
Roger J Van den Plas, Eindhoven, NL;
Pieter Hokkeling, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
In electric lamps a type of glass is used for the envelope which, in many cases, has a coefficient of expansion which differs considerably from that of the current supply conductors. Therefore, special measures have to be taken to seal the lamp envelope in a vacuum-tight manner around the current supply conductors. The invention provides a simple, vacuum-tight seal of a lamp envelope (1), which seal consists of a metal plug (8, 9, 11) which is sealed both to the glass of the lamp envelope (1) and to the current supply wires (4, 5, 10). The metal plug (8, 9, 11) of 100 parts by weight of a first metal (tin and/or lead) 0.05-1 parts by weight of a second metal (titanium, zirconium, hafnium, niobium, tantalum, and vanadium) has a strong adhering power and a large ductility.