US2501658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic horn
Assignee: Research Corp
•
Filing: 1942-10-12
•
Granted: 1950-03-28
•
Expires: 1962-10-12
Abstract
No abstract record available.
Inventors
- 👤 Wilmer L Barrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:35
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US435996A
Cited
US1653796A
Cited
US2206923A
Cited
US2130913A
Cited
US2297202A
Cited
FR841036A
Cited
US2283935A
Cited
US2255042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |