US2781017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signaling device
Assignee: Western Progress Inc
•
Filing: 1954-03-23
•
Granted: 1957-02-12
•
Expires: 1974-03-23
Abstract
No abstract record available.
Inventors
- 👤 Frank L Fuller
- 👤 Montgomery C Swezy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:58
CPC Classifications
B; B60; B60Q; B60Q7/00; B60Q7/005; E; E01; E01F; E01F9/00; E01F9/60; E01F9/688
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1966566A
Cited
US1879865A
Cited
US2170815A
Cited
US2519612A
Cited
US2483463A
Cited
US2693044A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-12 | 1960-08-13 | 1961-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-12 | 1964-08-13 | 1965-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-12 | 1968-08-13 | 1969-02-12 | $7700.00 | Window Closed / Lapsed |