US2890385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terminal structures for valve tubes
Assignee: Machlett Laboratories Inc
•
Filing: 1956-06-05
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Granted: 1959-06-09
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Expires: 1976-06-05
Abstract
No abstract record available.
Inventors
- 👤 Kirka Chester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:11
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/50; H01J5/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1418022A
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US2249672A
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US2399758A
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US2477372A
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US2411679A
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US2482277A
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US2457734A
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US2683836A
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US2561151A
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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) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |