US2485668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic cathode
Assignee: International Standard Electric Corp
•
Filing: 1945-12-05
•
Granted: 1949-10-25
•
Expires: 1965-12-05
Abstract
No abstract record available.
Inventors
- 👤 Smyth Charles Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:37
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/42; H01J2893/00; H01J2893/0001; H01J2893/0002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1892819A
Cited
US1946603A
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US1914883A
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US2015417A
Cited
US2130280A
Cited
US2130281A
Cited
US2210761A
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US2358542A
Cited
US2380525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-24 | 1953-04-25 | 1953-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-24 | 1957-04-25 | 1957-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-24 | 1961-04-25 | 1961-10-25 | $7700.00 | Window Closed / Lapsed |