Patent US2440735A successfully refreshed from Google Patents.
US2440735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrooptical device
Assignee: Farnsworth Research Corp
•
Filing: 1943-06-05
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Granted: 1948-05-04
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Expires: 1963-06-05
Abstract
No abstract record available.
Inventors
- 👤 Cawein Madison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:52
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J31/00; H01J31/08; H01J31/26; H01J31/28; H01J31/30; H01J31/48; H01J2229/00; H01J2229/89; H01J2229/893
Claims Analysis
Total Claims: 0
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US2211613A
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US2295779A
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US2298808A
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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) | 1951-05-04 | 1951-11-03 | 1952-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-04 | 1955-11-03 | 1956-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-04 | 1959-11-03 | 1960-05-04 | $7700.00 | Window Closed / Lapsed |