US2553749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing fixture for the manufacture of electron discharge devices
Assignee: AT&T Inc
•
Filing: 1948-05-05
•
Granted: 1951-05-22
•
Expires: 1968-05-05
Abstract
No abstract record available.
Inventors
- 👤 James E Clark
- 👤 Victor L Ronci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:22
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/82; H01J5/00; H01J5/20; H01J5/22; H01J5/26; H01J2893/00; H01J2893/0033; H01J2893/0037; H01J2893/0041; H01J2893/0043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1562533A
Cited
US2297492A
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US2374546A
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US2386820A
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US2422628A
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US2415412A
Cited
US2488302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |