Patent US2438668A successfully refreshed from Google Patents.
US2438668A
Expired / Lapsed
US
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Cathode-ray tube screen and process
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1944-04-28
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Granted: 1948-03-30
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Expires: 1964-04-28
Abstract
No abstract record available.
Inventors
- 👤 Stanley J Koch
- 👤 Robert E Rutherford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:22
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1982373A
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US2090922A
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GB424632A
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AU1501533A
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GB430809A
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US2121356A
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US2171970A
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US2155465A
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US2242644A
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US2197625A
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US2185590A
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GB500314A
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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) | 1951-03-30 | 1951-09-29 | 1952-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-30 | 1955-09-29 | 1956-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-30 | 1959-09-29 | 1960-03-30 | $7700.00 | Window Closed / Lapsed |