Patent US2557974A successfully refreshed from Google Patents.
US2557974A
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Light modulation system
Assignee: Farnsworth Research Corp
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Filing: 1945-08-13
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Granted: 1951-06-26
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Expires: 1965-08-13
Abstract
No abstract record available.
Inventors
- 👤 Paul J Kibler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:06
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/11; H; H04; H04B; H04B10/00; H04B10/50; H04B10/501; H04B10/503; H04B10/505; H04B10/5051
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1792046A
Cited
US1849488A
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US2032588A
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GB493318A
Cited
US2153490A
Cited
US2234320A
Cited
US2308360A
Cited
US2415226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |