US2752479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal light projector
Assignee: McGraw Electric Co
•
Filing: 1952-12-02
•
Granted: 1956-06-26
•
Expires: 1972-12-02
Abstract
No abstract record available.
Inventors
- 👤 Joseph G Atwood
- 👤 Philip B Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:33
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/18; B64F1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1639365A
Cited
US1647890A
Cited
US1700226A
Cited
US1861752A
Cited
US2282208A
Cited
US2582742A
Cited
US2556870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-26 | 1959-12-26 | 1960-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-26 | 1963-12-26 | 1964-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-26 | 1967-12-26 | 1968-06-26 | $7700.00 | Window Closed / Lapsed |