Patent US4421710A successfully refreshed from Google Patents.
Patent US615832A successfully refreshed from Google Patents.
Patent US4480212A successfully refreshed from Google Patents.
US4480212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extended life incandescent lamp with self contained diode and reflector
Assignee: PONTIAC TAX INCREMENT FINANCE AUTHORITY
•
Filing: 1982-06-14
•
Granted: 1984-10-30
•
Expires: 2002-06-14
Abstract
Abstract An incandescent lamp is disclosed having an extended operating life with a high operating efficiency in terms of lumens per watt. The lamp incorporates a rectifying diode in series with the filament and the filament has an operating temperature less than 2550° C. A reflector is mounted in the neck portion of the lamp for reflecting visible light outwardly through the bulb portion of the envelope and for minimizing convection currents in the base of the lamp. The diode is disposed between the reflector and the lamp base.
Inventors
- 👤 Russell Monahan
- 👤 Kevin J. Keating
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:40
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/62; H01K1/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
189 words
In an incandescent lamp of the type comprising: a glass envelope including a bulb portion, a neck portion and a stem, a screw base including a metal sleeve, an insulating base plug therein and a metal center contact in the insulating plug, a pair of lead-in wires extending through the stem, one of the lead-in wires being electrically connected to said center contact and the other being electrically connected to said sleeve, a wire filament disposed within said envelope and connected between said pair of lead-in wires, the improvement comprising: a diode electrically connected bewtween one of said lead-in wires and one of said base contacts and being disposed in said neck portion of the envelope adjacent said base, and a reflector supported on said stem adjacent the junction of said bulb portion and said neck portion and substantially closing the passageway between the bulb portion and the neck portion for reducing convection currents therebetween whereby heat loss through said base is reduced, said reflector being disposed between said diode and said filament whereby said diode is shielded from the heat of said filament for operation at reduced temperature.
Claim 2
Dependent Claim
189 words
In an incandescent lamp of the type comprising: a glass envelope including a bulb portion, a neck portion and a stem, a screw base including a metal sleeve, an insulating base plug therein and a metal center contact in the insulating plug, a pair of lead-in wires extending through the stem, one of the lead-in wires being electrically connected to said center contact and the other being electrically connected to said sleeve, a wire filament disposed within said envelope and connected between said pair of lead-in wires, the improvement comprising: a diode electrically connected bewtween one of said lead-in wires and one of said base contacts and being disposed in said neck portion of the envelope adjacent said base, and a reflector supported on said stem adjacent the junction of said bulb portion and said neck portion and substantially closing the passageway between the bulb portion and the neck portion for reducing convection currents therebetween whereby heat loss through said base is reduced, said reflector being disposed between said diode and said filament whereby said diode is shielded from the heat of said filament for operation at reduced temperature.
Claim 3
Dependent Claim
18 words
The invention as defined in claim 1 wherein said filament has an operating temperature below approximately 2550° C.
Claim 4
Dependent Claim
27 words
The invention as defined in claim 1 wherein said reflector comprises a convex surface of revolution facing said filament, said surface being highly reflective to visible light.
Claim 5
Dependent Claim
19 words
The invention as defined in claim 3 wherein said reflector is a sheet metal skirt supported on said stem.
Claim 6
Dependent Claim
19 words
The invention as defined in claim 3 or 4 wherein said convex surface of revolution is parabolic in cross-section.
Claim 7
Dependent Claim
23 words
The invention as defined in claim 3 wherein said envelope is filled with a mixture of krypton and argon gases at subatmospheric pressure.
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) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |