US2428792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illumination system
Assignee: Individual
•
Filing: 1945-06-28
•
Granted: 1947-10-14
•
Expires: 1965-06-28
Abstract
No abstract record available.
Inventors
- 👤 George H Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:39
CPC Classifications
G; G01; G01D; G01D11/00; G01D11/28; G12; G12B; G12B11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB507037A
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US1955173A
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US1951783A
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GB426789A
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GB426797A
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GB450513A
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US2029348A
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US2139707A
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US2336560A
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US2311492A
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US2310743A
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US2347671A
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US2347672A
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US2337745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |