US2435585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency relay employing an electron discharge device
Assignee: AT&T Inc
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Filing: 1941-12-20
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Granted: 1948-02-10
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Expires: 1961-12-20
Abstract
No abstract record available.
Inventors
- 👤 Paul L Hartman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:19
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/22; H01J25/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2022988A
Cited
US2201199A
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US2116996A
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US2227376A
Cited
US2244747A
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US2213104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-02-09 | 1951-08-11 | 1952-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-02-09 | 1955-08-11 | 1956-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-02-09 | 1959-08-11 | 1960-02-10 | $7700.00 | Window Closed / Lapsed |