US2542980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic horn
Assignee: Unisys Corp
•
Filing: 1946-02-19
•
Granted: 1951-02-27
•
Expires: 1966-02-19
Abstract
No abstract record available.
Inventors
- 👤 Wilmer L Barrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:33
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2039812A
Cited
US2129711A
Cited
US2052339A
Cited
US2206923A
Cited
US2106768A
Cited
US2202380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |