US3943395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular incandescent lamp having spaced segments
Assignee: GTE Sylvania Inc
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Filing: 1974-12-06
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Granted: 1976-03-09
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Expires: 1994-12-06
Abstract
Abstract In a tubular, double ended electric incandescent lamp in which the filament comprises coiled segments spaced from each other, the filament coiled segments are electrically connected by means of skip space wire sections coiled at each end thereof, which are threaded onto the filament segments.
Inventors
- 👤 Leroy Huston
- 👤 George D. Gounaris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:47
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/18; H01K1/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
109 words
In an elongated, tubular, double-ended incandescent lamp of the type where the filament is axially located and comprises separated filament coiled segments, the improvement which comprises spacer wire sections between said coiled segments, each spacer wire section consisting of a single length of wire and further consisting of a coil at each end thereof with an intermediate skip-space therebetween, each of said coils being electrically and mechanically fastened to the adjacent filament coiled segment by being threaded onto the end of said adjacent filament coiled segment, the diameter of the wire of said spacer wire section being larger than the diameter of the wire of said filament coiled segment.
Claim 2
Dependent Claim
109 words
In an elongated, tubular, double-ended incandescent lamp of the type where the filament is axially located and comprises separated filament coiled segments, the improvement which comprises spacer wire sections between said coiled segments, each spacer wire section consisting of a single length of wire and further consisting of a coil at each end thereof with an intermediate skip-space therebetween, each of said coils being electrically and mechanically fastened to the adjacent filament coiled segment by being threaded onto the end of said adjacent filament coiled segment, the diameter of the wire of said spacer wire section being larger than the diameter of the wire of said filament coiled segment.
Claim 3
Dependent Claim
18 words
The lamp of claim 1 wherein the ratio of said respective diameters is between about 1.3 and 1.8.
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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |