US2811597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic speed reducing signal for motor vehicles
Assignee: Individual
•
Filing: 1955-04-26
•
Granted: 1957-10-29
•
Expires: 1975-04-26
Abstract
No abstract record available.
Inventors
- 👤 Charles F Havelka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:46
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/50; B60Q1/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1311135A
Cited
US1682098A
Cited
US1652449A
Cited
US1897074A
Cited
US2069272A
Cited
US2574616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |