US3849699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single base, self-igniting fluorescent lamp
Assignee: GTE Sylvania Inc
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Filing: 1973-12-05
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Granted: 1974-11-19
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Expires: 1993-12-05
Abstract
Abstract A fluorescent lamp having a tubular glass envelope with a base attached to only one end and a flat seal or dome seal at the other end. A single mount structure is sealed within the envelope at the base end and comprises a first electrode supported at the base end, a lead-in wire connecting the first electrode to the base, a rigid glass tube projecting from the base end toward the flat seal end, a second electrode supported by the glass tube at the flat seal end, a lead-in wire passing coaxially through the glass tube to connect the second electrode to the base, and an ignition coil with an emissive coating connected between the electrodes and suspended away from the arc discharge path by support wires projecting from the glass tube.
Inventors
- 👤 W Roche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:41
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/54; H01J61/545
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
196 words
A fluorescent lamp comprising: an hermetically sealed, tubular glass envelope; a phosphor coating on the insiDe surface of said envelope; mercury and a rare gas contained in said envelope; a lamp base attached to one end of said envelope; and a mount structure sealed in said one end of said envelope and comprising, a first electrode supported at said one end of said envelope, a first lead-in wire electrically connecting said first electrode to a first terminal of said base, a rigid insulating tube within said envelope projecting from said one end of said envelope toward the other end thereof, a second electrode supported by said tube at said other end of the envelope, a second lead-in wire passing through the length of said insulating tube and electrically connecting said second electrode to a second terminal of said base, an ignition coil located within said envelope and electrically connected between said first and second electrodes, said ignition coil having an electron emissive coating over substantially its entire length, and support means projecting from said insulating tube and suspending said ignition coil away from the axis of the arc discharge path between said first and second electrodes.
Claim 2
Dependent Claim
196 words
A fluorescent lamp comprising: an hermetically sealed, tubular glass envelope; a phosphor coating on the insiDe surface of said envelope; mercury and a rare gas contained in said envelope; a lamp base attached to one end of said envelope; and a mount structure sealed in said one end of said envelope and comprising, a first electrode supported at said one end of said envelope, a first lead-in wire electrically connecting said first electrode to a first terminal of said base, a rigid insulating tube within said envelope projecting from said one end of said envelope toward the other end thereof, a second electrode supported by said tube at said other end of the envelope, a second lead-in wire passing through the length of said insulating tube and electrically connecting said second electrode to a second terminal of said base, an ignition coil located within said envelope and electrically connected between said first and second electrodes, said ignition coil having an electron emissive coating over substantially its entire length, and support means projecting from said insulating tube and suspending said ignition coil away from the axis of the arc discharge path between said first and second electrodes.
Claim 3
Dependent Claim
52 words
A lamp according to claim 1 wherein said first electrode comprises a portion of said ignition coil at the junction of said ignition coil and said first lead-in wire, and said second electrode comprises a portion of said ignition coil at the junction of said ignition coil and said second lead-in wire.
Claim 4
Dependent Claim
60 words
A lamp according to claim 2 wherein each of said first and second electrodes includes a cathode element and an anode element, each cathode element comprising said respective portion of ignition coil at the junction with a respective lead-in wire, and each anode element comprising a piece of metal electrically attached to said coil junction with a respective lead-in wire.
Claim 5
Dependent Claim
52 words
A lamp according to claim 3 wherein said insulating tube is glass, said second lead-in wire is located substantially coaxial within said glass tube, said ignition coil comprises a coiled-coil tungsten wire having an electron emissive coating over its entire length, and each of said anode elements comprises a strip of metal.
Claim 6
Dependent Claim
39 words
A lamp according to claim 4 wherein: said emissive coating comprises a mixture of barium, strontium and calcium carbonates reduced to oxide form; and each of said anode elements comprises a strip of nickel or nickel plated stainless steel.
Claim 7
Dependent Claim
26 words
A lamp according to claim 1 wherein said tubular glass envelope has a flat seal at the end opposite that to which said base is attached.
Claim 8
Dependent Claim
25 words
A lamp according to claim 6 wherein said insulating tube is glass, and said second lead-in wire is located substantially coaxial within said glass tube.
Claim 9
Dependent Claim
35 words
A lamp according to claim 7 further including a resilient wire support means disposed at the flat seal end of said tubular envelope for supporting the end of said glass tube remote from said base.
Claim 10
Dependent Claim
61 words
A lamp according to claim 1 wherein a V-shaped ionization coil structure is formed from said ignition coil and located at approximately the center of said length of ignition coil, said V-shaped coil structure being supported from said insulating tube, and a substantial portion of the remainder of said ignition coil being suspended linearly between the ends of said insulating tube.
References Cited (Backward Citations)
US2344122A
Cited
US2930934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |