US2609520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube
Assignee: AT&T Inc
•
Filing: 1947-06-11
•
Granted: 1952-09-02
•
Expires: 1967-06-11
Abstract
No abstract record available.
Inventors
- 👤 John R Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:24
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J25/00; H01J25/02; H01J25/10; H01J25/78; H01J29/00; H01J29/46; H01J29/52; H01J29/58; H01J29/62; H01J29/622; H01J29/624; H04; H04N; H04N5/00; H04N5/66; H04N5/68
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2081942A
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US2171970A
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US2272165A
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US2288694A
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US2409179A
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US2407708A
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US2462496A
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US2413725A
Cited
US2413244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-02 | 1956-03-03 | 1956-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-02 | 1960-03-03 | 1960-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-02 | 1964-03-03 | 1964-09-02 | $7700.00 | Window Closed / Lapsed |