Patent US457783A successfully refreshed from Google Patents.
Patent US3308342A successfully refreshed from Google Patents.
US3308342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply for negative-resistance arc-discharge lamps
Assignee: AT&T Inc
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Filing: 1963-09-24
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Granted: 1967-03-07
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Expires: 1983-09-24
Abstract
No abstract record available.
Inventors
- 👤 Richard A Coradeschi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:17
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/282; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/523; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
AN INVERTER FOR SUPPLYING AT LEAST ONE FLUORESCENT LAMP FROM A LOW IMPEDANCE SOURCE OF DIRECT CURRENT POTENTIAL COMPRISING AN INDUCTOR, A FIRST DIRECT CURRENT CIRCUIT PATH CONNECTING SAID INDUCTOR AND SAID LAMP IN SERIES ACROSS SAID SOURCES, A SATURABLE AUTOTRANSFORMER HAVING PRIMARY AND SECONDARY WINDINGS, A SEMICONDUCTOR SWITCH HAVING A TRANSCONDUCTIVE PATH AND A CONTROL ELECTRODE, A SECOND DIRECT CURRENT CIRCUIT PATH CONNECTING SAID
Claim 2
Dependent Claim
65 words
AN INVERTER FOR SUPPLYING AT LEAST ONE FLUORESCENT LAMP FROM A LOW IMPEDANCE SOURCE OF DIRECT CURRENT POTENTIAL COMPRISING AN INDUCTOR, A FIRST DIRECT CURRENT CIRCUIT PATH CONNECTING SAID INDUCTOR AND SAID LAMP IN SERIES ACROSS SAID SOURCES, A SATURABLE AUTOTRANSFORMER HAVING PRIMARY AND SECONDARY WINDINGS, A SEMICONDUCTOR SWITCH HAVING A TRANSCONDUCTIVE PATH AND A CONTROL ELECTRODE, A SECOND DIRECT CURRENT CIRCUIT PATH CONNECTING SAID
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |