Abstract This invention relates to electric incandescent lamps having a tungsten filament and a bulb made of heat-resistant and pervious material such as quartz glass in which boron tribromide is provided constituting a reactive transport gas for establishing the regenerative cycle in addition to the usual inert gas such as argon and nitrogen. Thereby various faults inevitable in the usual incandescent lamps filled with a regenerative gas in the form of various halogen compounds are avoided or are overcome, and maintain a rather longer life. When boron tribromide is filled in the amount ranging from 0.8 X 10 7 to 2.0 X 10 5 gram molecule per 1 cm.3 of inner volume of the bulb, the bulb life can be considerably extended.
Inventors
👤 Tashio Takahashi
👤 Utami Mikami
👤 Shigeru Suzuki
👤 Hideyuki Sato
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-30 20:32
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
An incandescent electric lamp comprising a bulb constituted of heat-resistant and light-transmitting material, a tungsten wire filament mounted in said bulb and having opposite ends, lead conductors sealed and extending through at least one end of said bulb and electrically connected respectively to each of the ends of said filament, said bulb being filled with an inert gas and with a halogen, said halogen constituting a reactive transport gas, said halogen being constituted of boron tribromide, the quantity of said boron tribromide ranging from 0.8 X 10 7 to 2.0 X 10 5 gram molecule per 1 cm.3 of inner volume of the bulb.
Claim 2
Dependent Claim
104 words
An incandescent electric lamp comprising a bulb constituted of heat-resistant and light-transmitting material, a tungsten wire filament mounted in said bulb and having opposite ends, lead conductors sealed and extending through at least one end of said bulb and electrically connected respectively to each of the ends of said filament, said bulb being filled with an inert gas and with a halogen, said halogen constituting a reactive transport gas, said halogen being constituted of boron tribromide, the quantity of said boron tribromide ranging from 0.8 X 10 7 to 2.0 X 10 5 gram molecule per 1 cm.3 of inner volume of the bulb.
Claim 3
Dependent Claim
25 words
An incandescent electric lamp as claimed in claim 1 wherein said bulb includes opposite end portions, said lead conductors extending through said end portions respectively.
Claim 4
Dependent Claim
26 words
An incandescent electric lamp as claimed in claim 1 including a pair of metallic foils interconnecting said lead conductors to said ends of said filament respectively.
Claim 5
Dependent Claim
18 words
An incandescent electric lamp as claimed in claim 3 wherein said metallic foils are each constituted of molybdenum.
Claim 6
Dependent Claim
18 words
An incandescent electric lamp as claimed in claim 1 wherein said filament is constituted of a helical coil.