US2572144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic rate of speed-change signal system
Assignee: Individual
•
Filing: 1947-07-11
•
Granted: 1951-10-23
•
Expires: 1967-07-11
Abstract
No abstract record available.
Inventors
- 👤 Donald V Healy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:53
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/44; B60Q1/444
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US740547A
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GB193874A
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US1601562A
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US1486517A
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US1897074A
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US2079539A
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US2128841A
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US2234309A
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US2433585A
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US2408711A
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US2462655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |