Patent US3457400A successfully refreshed from Google Patents.
US3457400A
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US
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Apparatus and method for directing a beacon toward a limited viewing area
Assignee: 3M Co
•
Filing: 1966-08-10
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Granted: 1969-07-22
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Expires: 1986-08-10
Abstract
No abstract record available.
Inventors
- 👤 Roger H Appeldorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:20
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/04; B64F1/06; G; G08; G08B; G08B5/00; F; F21; F21W; F21W2111/00; F21W2111/02; F21W2111/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1397822A
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US1507367A
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US1635863A
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US1669740A
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US1845628A
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US2366356A
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US2441877A
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US2420976A
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US2559415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |