US2589522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode heater structure
Assignee: —
•
Filing: —
•
Granted: 1952-03-18
•
Expires: 1969-03-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:29
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/15; H01J1/20; H01J9/00; H01J9/02; H01J9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1459412A
Cited
US1678145A
Cited
US2112969A
Cited
US1881644A
Cited
US1991197A
Cited
GB401638A
Cited
US2014787A
Cited
US2247869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |