Patent US1544020A successfully refreshed from Google Patents.
US1544020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signaling device
Assignee: Individual
•
Filing: 1923-03-10
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Granted: 1925-06-30
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Expires: 1943-03-10
Abstract
No abstract record available.
Inventors
- 👤 Henry R Maddox
- 👤 Francis I S Hull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:23
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1928-06-29 | 1928-12-29 | 1929-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-06-29 | 1932-12-29 | 1933-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-06-29 | 1936-12-29 | 1937-06-30 | $7700.00 | Window Closed / Lapsed |