US3849689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sequential discharge fluorescent lamp
Assignee: General Electric Co
•
Filing: 1973-07-02
•
Granted: 1974-11-19
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Expires: 1993-07-02
Abstract
Abstract A fluorescent lamp having parallel sequential discharge paths along the space between a pair of concentrically positioned envelope members. At least one of the concentric envelope members is provided with grooves respectively extending along the discharge paths and functioning to stabilize the sequential discharges and to provide increased phosphor coating area.
Inventors
- 👤 J Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:41
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/10; H01J61/103; H01J61/92
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A vapor discharge lamp comprising a pair of envelope members in parallel spaced apart relationship and electrode means defining a plurality of parallel sequential vapor discharge paths between and parallel to said envelope members, the surface of at least one of said envelope members being shaped to provide a plurality of grooves respectively extending along and facing said vapor discharge paths, each adjacent pair of said grooves defining a rib spaced sufficiently from the other of said envelope members to permit the vapor discharge of said lamp to shift from one groove to the next through the space between said rib and said other envelope member.
Claim 2
Dependent Claim
106 words
A vapor discharge lamp comprising a pair of envelope members in parallel spaced apart relationship and electrode means defining a plurality of parallel sequential vapor discharge paths between and parallel to said envelope members, the surface of at least one of said envelope members being shaped to provide a plurality of grooves respectively extending along and facing said vapor discharge paths, each adjacent pair of said grooves defining a rib spaced sufficiently from the other of said envelope members to permit the vapor discharge of said lamp to shift from one groove to the next through the space between said rib and said other envelope member.
Claim 3
Dependent Claim
22 words
A lamp as claimed in claim 1 in which said pair of envelope members comprises a pair of concentrically positioned glass tubes.
Claim 4
Dependent Claim
25 words
A lamp as claimed in claim 2 in which the outer surface of the inner glass tube is shaped to provide said plurality of grooves.
Claim 5
Dependent Claim
101 words
A lamp as claimed in claim 3 including means hermetically interconnecting said concentric tubes at the bottom ends thereof, the top end of the outer tube being closed over and spaced from the top end of the inner tube, a common electrode positioned within aNd near the bottom of said inner tube, and a plurality of additional electrodes positioned in a circular configuration between said concentric tubes near the bottoms thereof, said vapor discharge paths extending upwardly from the respective said additional electrodes, each of said grooves facing and being symmetrical with respect to a respective one of said additional electrodes.
Claim 6
Dependent Claim
18 words
A lamp as claimed in claim 4 in which each of said grooves has a concave cross-sectional shape.
Claim 7
Dependent Claim
30 words
A lamp as claimed in claim 5 in which each pair of adjacent grooves forms a rib extending partly into the space between a pair of adjacent vapor discharge paths.
Claim 8
Dependent Claim
34 words
A lamp as claimed in claim 6 in which each of said ribs is parallel to, and spaced about 1/16 to 1/8 of an inch away from, the inner surface of the outer tube.
Claim 9
Dependent Claim
30 words
A lamp as claimed in claim 7 including coatings of phosphor on the inner and outer surfaces of the inner tube and on the inner surface of the outer tube.
References Cited (Backward Citations)
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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) | 1977-11-18 | 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 |