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. 16, 2004
Filed:
Sep. 07, 2000
Marcel Rene Bohmer, Eindhoven, NL;
Ingrid Jozef Maria Snijkers-Hendrickx, Eindhoven, NL;
Paulina Maria Christina Neilen-Ten Wolde, Eindhoven, NL;
Theodora Antonia Petra Maria Keursten, Eindhoven, NL;
Remy Cyrille Broersma, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The electric lamp comprises a lamp vessel ( ) which is transparent to visible light and which accommodates a light source. At least a part of the lamp vessel ( ) is covered with a light-absorbing coating ( ). According to the invention, the light-absorbing coating ( ) comprises a network which can be obtained by conversion of an organically modified silane by a sol-gel process. The organically modified silane is selected from the group formed by compounds of structural formula R′Si(OR″) , wherein R′ is an alkyl or aryl group and R″ is an alkyl group. Preferably, R′ is CH or C H and R″ is CH or C H . Nano-sized silica particles having a diameter d≦50 nm may be incorporated in the network. The pigment is preferably chosen from the group formed by Fe O , P-doped Fe O , ZnFe O , ZnO.Fe O , CoAl O , Nd O , BiVO and zirconium praseodymium silicate or mixtures thereof. The light-absorbing coating ( ) of the electric lamp according to the invention is optically transparent, substantially free of scattering and stable at temperatures up to 350° C.