Patent US2579018A successfully refreshed from Google Patents.
US2579018A
Expired / Lapsed
US
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Directed beam light unit
Assignee: Individual
•
Filing: 1948-04-01
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Granted: 1951-12-18
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Expires: 1968-04-01
Abstract
No abstract record available.
Inventors
- 👤 Frank W Schwinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:59
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/02; B60Q1/04; B60Q1/0483
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1404281A
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US1335146A
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US1509783A
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US1786814A
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US1705065A
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US2135263A
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GB477072A
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US2273130A
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US2185600A
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US2249858A
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US2252950A
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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) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |