US3899708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise free incandescent lamp
Assignee: GTE Sylvania Inc
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Filing: 1974-04-10
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Granted: 1975-08-12
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Expires: 1994-04-10
Abstract
Abstract A gas-filled incandescent lamp in a solid-state dimming circuit has lead-in wires made of nonmagnetic metal in order to reduce magnetically-induced noise resulting from the modified voltage output of the dimmer.
Inventors
- 👤 Alexander Tartakoff
- 👤 John J Gutta
- 👤 Robert M Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:41
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
In an incandescent lamp for use with a solid-state dimmer of the type that can induce noisy physical vibrations in lamp magnetic lead-in wires, said lamp including a gas filled glass envelope sealed at its lower end to the flare of a stem press glass mount and a metal base attached to the lower end of the envelope, the improvement comprising two outer lead-in wires connected to said base and extending to said stem press where they are connected to intermediate wires embedded in said stem press where they are connected to intermediate wires embedded in said stem press; two inner lead-in wires connected to said intermediate wires and extending inwardly in said envelope, said inner and outer lead-in wires being made of nonmagnetic metal; and a coiled tungsten filament connected to and supported by said inner lead-in wires.
Claim 2
Dependent Claim
139 words
In an incandescent lamp for use with a solid-state dimmer of the type that can induce noisy physical vibrations in lamp magnetic lead-in wires, said lamp including a gas filled glass envelope sealed at its lower end to the flare of a stem press glass mount and a metal base attached to the lower end of the envelope, the improvement comprising two outer lead-in wires connected to said base and extending to said stem press where they are connected to intermediate wires embedded in said stem press where they are connected to intermediate wires embedded in said stem press; two inner lead-in wires connected to said intermediate wires and extending inwardly in said envelope, said inner and outer lead-in wires being made of nonmagnetic metal; and a coiled tungsten filament connected to and supported by said inner lead-in wires.
Claim 3
Dependent Claim
17 words
The lamp of claim 1 wherein said inner lead-in wires comprise an alloy of nickel and chromium.
Claim 4
Dependent Claim
18 words
The lamp of claim 1 wherein said inner lead-in wires comprise an alloy of copper, silicon and manganese.
Claim 5
Dependent Claim
17 words
The lamp of claim 1 wherein said inner lead-in wires comprise an alloy of copper and zirconium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |