Patent US2804560A successfully refreshed from Google Patents.
US2804560A
Expired / Lapsed
US
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Electronic device sensitive to invisible images
Assignee: Individual
•
Filing: 1951-06-01
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Granted: 1957-08-27
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Expires: 1971-06-01
Abstract
No abstract record available.
Inventors
- 👤 Sheldon Edward Emanuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:27
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/49
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2270373A
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US2344043A
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US2549072A
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US2541374A
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US2555423A
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US2545982A
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US2555424A
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US2681868A
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US2579351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |