US3869631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diode-containing incandescent lamp having improved efficiency
Assignee: GTE Sylvania Inc
•
Filing: 1974-05-31
•
Granted: 1975-03-04
•
Expires: 1994-05-31
Abstract
Abstract An incandescent lamp, having a glass envelope containing a gas fill and a tungsten filament, has a diode in series with the filament and positioned between the screw base of the lamp and the stem press of the lamp. The filament is made of tungsten wire having a wire weight about 50% greater than is normal for the lamp rating.
Inventors
- 👤 Warren A Anderson
- 👤 Edmund M Passmore
- 👤 Wilfrid G Matheson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:48
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
An incandescent lamp comprising: a gas filled glass envelope sealed at its lower end to the flare of a stem press glass mount; a screw base having a center contact attached to the lower end of said envelope; two lead-in wires extending through the stem press of said mount, one of said lead-in wires being electrically connected to said center contact and the other being electrically connected to the rim of said screw base; a diode electrically connected between one of said lead-in wires and said base; and a coiled tungsten wire filament disposed within said envelope and connected between said two lead-in wires, the relationship between the diode and the filament being such that the filament temperature during normal lamp operation is at least 2,600* Kelvin.
Claim 2
Dependent Claim
127 words
An incandescent lamp comprising: a gas filled glass envelope sealed at its lower end to the flare of a stem press glass mount; a screw base having a center contact attached to the lower end of said envelope; two lead-in wires extending through the stem press of said mount, one of said lead-in wires being electrically connected to said center contact and the other being electrically connected to the rim of said screw base; a diode electrically connected between one of said lead-in wires and said base; and a coiled tungsten wire filament disposed within said envelope and connected between said two lead-in wires, the relationship between the diode and the filament being such that the filament temperature during normal lamp operation is at least 2,600* Kelvin.
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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |