US2858481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operating circuit for compact type arc lamps
Assignee: Engelhard Industries Inc
•
Filing: 1954-06-02
•
Granted: 1958-10-28
•
Expires: 1974-06-02
Abstract
No abstract record available.
Inventors
- 👤 Lester F Bird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:46
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/20; H05B41/23; H05B41/231; Y; Y10; Y10S; Y10S315/00; Y10S315/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1445206A
Cited
US1668615A
Cited
US2122436A
Cited
US2212950A
Cited
US2352992A
Cited
US2470460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |