US2848712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic sleep-warning system device for automobiles
Assignee: Individual
•
Filing: 1957-08-12
•
Granted: 1958-08-19
•
Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 James N Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:39
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/0076; B60Q1/0082; H; H01; H01H; H01H29/00; H01H29/20; H01H43/00; H01H43/30; H01H43/301; H01H43/302; H01H43/304
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1843825A
Cited
US2673906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |