Patent US2500201A successfully refreshed from Google Patents.
US2500201A
Expired / Lapsed
US
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Signal light projection device
Assignee: MARSHALL CRUMMIE
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Filing: 1947-04-30
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Granted: 1950-03-14
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Expires: 1967-04-30
Abstract
No abstract record available.
Inventors
- 👤 Porter Hallie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:37
CPC Classifications
G; G09; G09F; G09F19/00; G09F19/12; G09F19/18; B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1350539A
Cited
US1032160A
Cited
US1202812A
Cited
US1290947A
Cited
US1519535A
Cited
US1859515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |