Patent US3784865A successfully refreshed from Google Patents.
US3784865A
Expired / Lapsed
US
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Filament support
Assignee: General Electric Co
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Filing: 1972-02-04
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Granted: 1974-01-08
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Expires: 1992-02-04
Abstract
Abstract A wire support for the coiled-coil filament of a tubular incandescent lamp having a pinch seal in which the wire support is formed with two transverse helical sections of several turns each with the sections having different diameters, the one of smaller diameter receiving the filament and the one of larger diameter engaging the inner wall of the envelope, the support being provided with a longitudinal tail section sealed in the press. In assembly, the helical section of larger diameter is twisted to reduce its diameter to enable passing the envelope over the wire support.
Inventors
- 👤 B Shanks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:08
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/18; H01K1/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
In an electric incandescent lamp having a tubular envelope, a helical coiled-coil filament within the envelope, and lead-in conductors connected to the filament, said lead-in conductors being hermetically sealed in the envelope with a pinch seal; the improvement which comprises a wire filament support having a first helical portion of several turns surrounding and supporting said filament and a second helical portion of several turns engaging the inner wall of said envelope, said wire support having a tail extending from the second helical portion parallel to the longitudinal axis of the envelope and being anchored in the pinch seal, said first helical portion having a termination which is unexposed when viewed through the diameter of the first helix in a direction forward of said tail portion, the space between wire turns of the first helix being smaller than the diameter of the primary turns of the coiled-coil filament.
Claim 2
Dependent Claim
148 words
In an electric incandescent lamp having a tubular envelope, a helical coiled-coil filament within the envelope, and lead-in conductors connected to the filament, said lead-in conductors being hermetically sealed in the envelope with a pinch seal; the improvement which comprises a wire filament support having a first helical portion of several turns surrounding and supporting said filament and a second helical portion of several turns engaging the inner wall of said envelope, said wire support having a tail extending from the second helical portion parallel to the longitudinal axis of the envelope and being anchored in the pinch seal, said first helical portion having a termination which is unexposed when viewed through the diameter of the first helix in a direction forward of said tail portion, the space between wire turns of the first helix being smaller than the diameter of the primary turns of the coiled-coil filament.
References Cited (Backward Citations)
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US3416024A
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US3535577A
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US3521112A
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |