US1755796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron-tube apparatus
Assignee: RUBEN PATENTS Co
•
Filing: 1924-12-10
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Granted: 1930-04-22
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Expires: 1944-12-10
Abstract
No abstract record available.
Inventors
- 👤 Ruben Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:00
CPC Classifications
H; H01; H01H; H01H47/00; H01H47/22; H01H47/26; H01H37/00; H01H37/02; H01H37/64; H01H37/68
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1933-04-21 | 1933-10-21 | 1934-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-04-21 | 1937-10-21 | 1938-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-04-21 | 1941-10-21 | 1942-04-22 | $7700.00 | Window Closed / Lapsed |