US2843801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical discharge lamp
Assignee: Individual
•
Filing: 1953-01-02
•
Granted: 1958-07-15
•
Expires: 1973-01-02
Abstract
No abstract record available.
Inventors
- 👤 Krefft Hermann Eduard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:02
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/52; H01J61/54; H01J61/545
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2007923A
Cited
US1956599A
Cited
US2094848A
Cited
US2103034A
Cited
US2263171A
Cited
US2304907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |