US2235190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic tube circuit
Assignee: RCA Corp
•
Filing: 1938-03-09
•
Granted: 1941-03-18
•
Expires: 1958-03-09
Abstract
No abstract record available.
Inventors
- 👤 Alma Gerrit Hendrik Petrus
- 👤 Jonker Johan Lodewijk Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:31
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/52; H; H01; H01J; H01J43/00; H01J43/02; H01J43/025
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) | 1944-03-17 | 1944-09-16 | 1945-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-03-17 | 1948-09-16 | 1949-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-03-17 | 1952-09-16 | 1953-03-18 | $7700.00 | Window Closed / Lapsed |