US4366409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halogen incandescent lamp
Assignee: Toshiba Corp
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Filing: 1980-05-14
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Granted: 1982-12-28
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Expires: 2000-05-14
Abstract
Abstract A halogen incandescent lamp performing halogen cycle in operation, comprising a bulb formed of light-transmitting material in which gas containing halogen atoms and inert gas are enclosed, a tungsten filament with working temperature of 2,800° K. or more contained in the bulb, at least a pair of lead-in wires connected to or integrally formed on both ends of the tungsten filament, respectively, and having a part sealed in the bulb, the lamp characterized in that the light-transmitting material is aluminosilicate glass having a strain point of 660° C. or higher and an average thermal expansion coefficient of 41×10 -7 to 48×10 -7 cm/cm/°C. at a temperature of 100° to 300° C., and that at least filament-side seal portions of the lead-in wires have a diameter of 0.2 to 0.6 mm.
Inventors
- 👤 Yasuhiro Nieda
- 👤 Kiyokazu Honda
- 👤 Hidehiro Shinada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:12
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/28; C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
A halogen incandescent lamp performing a halogen cycle in operation, comprising a bulb formed of light-transmitting material in which gas containing halogen atoms and inert gas are enclosed, a tungsten filament with working temperature of 2,800° K or more contained in said bulb, at least a pair of lead-in wires connected to or integrally formed on both ends of said tungsten filament, respectively, and having a part sealed in said bulb, said lamp characterized in that said light-transmitting material is aluminosilicate glass having a strain point of 660° C. or higher and an average thermal expansion coefficient of 41×10 -7 to 48×10 -7 cm/cm/°C. at a temperature of 100° to 300° C., and that at least filament-side seal portions of said lead-in wires are molybdenum wires having a diameter of 0.4 to 0.6 mm.
Claim 2
Dependent Claim
134 words
A halogen incandescent lamp performing a halogen cycle in operation, comprising a bulb formed of light-transmitting material in which gas containing halogen atoms and inert gas are enclosed, a tungsten filament with working temperature of 2,800° K or more contained in said bulb, at least a pair of lead-in wires connected to or integrally formed on both ends of said tungsten filament, respectively, and having a part sealed in said bulb, said lamp characterized in that said light-transmitting material is aluminosilicate glass having a strain point of 660° C. or higher and an average thermal expansion coefficient of 41×10 -7 to 48×10 -7 cm/cm/°C. at a temperature of 100° to 300° C., and that at least filament-side seal portions of said lead-in wires are molybdenum wires having a diameter of 0.4 to 0.6 mm.
Claim 3
Dependent Claim
134 words
A halogen incandescent lamp performing a halogen cycle in operation, comprising a bulb formed of light-transmitting material in which gas containing halogen atoms and inert gas are enclosed, a tungsten filament with working temperature of 2,800° K. or more contained in said bulb, at least a pair of lead-in wires connected to or integrally formed on both ends of said tungsten filament, respectively, and having a part sealed in said bulb, said lamp characterized in that said light-transmitting material is aluminosilicate glass having a strain point of 660° C. or higher and an average thermal expansion coefficient of 41×10 -7 to 48×10 -7 cm/cm/°C. at a temperature of 100° to 300° C., and that at least filament-side seal portions of said lead-in wires are tungsten wires having a diameter of 0.2 to 0.4 mm.
Claim 4
Dependent Claim
134 words
A halogen incandescent lamp performing a halogen cycle in operation, comprising a bulb formed of light-transmitting material in which gas containing halogen atoms and inert gas are enclosed, a tungsten filament with working temperature of 2,800° K. or more contained in said bulb, at least a pair of lead-in wires connected to or integrally formed on both ends of said tungsten filament, respectively, and having a part sealed in said bulb, said lamp characterized in that said light-transmitting material is aluminosilicate glass having a strain point of 660° C. or higher and an average thermal expansion coefficient of 41×10 -7 to 48×10 -7 cm/cm/°C. at a temperature of 100° to 300° C., and that at least filament-side seal portions of said lead-in wires are tungsten wires having a diameter of 0.2 to 0.4 mm.
Claim 5
Dependent Claim
63 words
A halogen incandescent lamp according to claim 1 or 2 characterized in that the principal ingredients of said aluminosilicate glass are as follows: SiO 2 : 55 to 65 wt. % Al 2 O 3 : 15 to 22 wt. % CaO: 5 to 10 wt. % MgO: 6 to 10 wt. % B 2 O 3 : 3 to 6 wt. %
Claim 6
Dependent Claim
80 words
A halogen incandescent lamp according to any one of claims 1 or 2 characterized in that said pair of lead-in wires are composed of a pair of inner lead-in wires and a pair of outer lead-in wires connected with each other at portions where said lead-in wires are sealed in said bulb, said pair of inner lead-in wires being connected respectively to both ends of said filament, and said pair of outer lead-in wires being led out of said bulb.
Claim 7
Dependent Claim
19 words
A halogen incandescent lamp according to claim 4 characterized in that said outer lead-in wires are made of nickel.
Claim 8
Dependent Claim
28 words
A halogen incandescent lamp according to claim 1 or 2 characterized in that the total pressure of the gas enclosed in said bulb is 4 to 10 atm.
Claim 9
Dependent Claim
17 words
A halogen incandescent lamp according to claim 1 or 2 characterized in that said halogen is bromine.
Claim 10
Dependent Claim
31 words
A halogen incandescent lamp according to claim 7 characterized in that the atomic weight of said bromine is 0.1×10 -7 to 0.5×10 -6 gram atom per 1 cc of bulb capacity.
Claim 11
Dependent Claim
20 words
A halogen incandescent lamp according to claim 7 characterized in that said gas containing halogen atoms further contains hydrogen atoms.
Claim 12
Dependent Claim
26 words
A halogen incandescent lamp according to claim 9 characterized in that said gas containing halogen atoms is a gas mixture of bromine gas and hydrogen gas.
Claim 13
Dependent Claim
34 words
A halogen incandescent lamp according to claim 9 characterized in that said gas containing halogen atoms is formed of at least one member selected from the group consisting of hydrogen bromide and hydrocarbon bromide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |