US2532836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic tube
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-07-20
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Granted: 1950-12-05
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Expires: 1966-07-20
Abstract
No abstract record available.
Inventors
- 👤 Cupido Piet Marinus
- 👤 Jonker Johan Lodewijk Hendrik
- 👤 Adrianus Johannes Wilhel Marie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:55
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/78; H01J7/00; H01J7/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |