US2421039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode structure
Assignee: STC PLC
•
Filing: 1944-01-31
•
Granted: 1947-05-27
•
Expires: 1964-01-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Carl A Segerstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:53
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/36; H01J1/00; H01J1/02; H01J1/13; H01J1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1102249A
Cited
US1539497A
Cited
US1866195A
Cited
FR700923A
Cited
US2051637A
Cited
US2300891A
Cited
US2357905A
Cited
US2367332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-26 | 1950-11-25 | 1951-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-26 | 1954-11-25 | 1955-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-26 | 1958-11-25 | 1959-05-27 | $7700.00 | Window Closed / Lapsed |