US2420634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lantern
Assignee: NIAGARA SEARCHLIGHT Co IN
•
Filing: 1944-06-14
•
Granted: 1947-05-13
•
Expires: 1964-06-14
Abstract
No abstract record available.
Inventors
- 👤 Charles E Wohler
- 👤 Lewis G Sherwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:01
CPC Classifications
F; F21; F21L; F21L4/00; F21V; F21V23/00; F21V23/04; F21V23/0414
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB122914A
Cited
US1384017A
Cited
US1504869A
Cited
US1698912A
Cited
US2080583A
Cited
CH201109A
Cited
US2245793A
Cited
US2259696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |