Patent US4792809A successfully refreshed from Google Patents.
US2777049A
Expired / Lapsed
US
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Light signal projector
Assignee: McGraw Electric Co
•
Filing: 1952-12-30
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Granted: 1957-01-08
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Expires: 1972-12-30
Abstract
No abstract record available.
Inventors
- 👤 Philip B Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:18
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/18; B64F1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1407427A
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GB276040A
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US1861752A
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US1960148A
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US2133377A
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US2192019A
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US2462222A
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US2493087A
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US2655591A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |