Patent US3544839A successfully refreshed from Google Patents.
US3544839A
Expired / Lapsed
US
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Apparatus for starting and operating electric discharge lamps,more particularly such lamps with starting voltages exceeding 1000 volts
Assignee: Osram GmbH
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Filing: 1968-10-11
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Granted: 1970-12-01
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Expires: 1988-10-11
Abstract
No abstract record available.
Inventors
- 👤 Hans-Jurgen Fahnrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:37
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/02; H05B41/04; H05B41/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3310687A
Cited
US3334270A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |