Patent US2554902A successfully refreshed from Google Patents.
US2554902A
Expired / Lapsed
US
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Thermionic discharge device control
Assignee: National Research Corp
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Filing: 1948-03-25
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Granted: 1951-05-29
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Expires: 1968-03-25
Abstract
No abstract record available.
Inventors
- 👤 Godley Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:19
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/28; C23C14/30; Y; Y10; Y10S; Y10S164/00; Y10S164/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-28 | 1954-11-27 | 1955-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-28 | 1958-11-27 | 1959-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-28 | 1962-11-27 | 1963-05-29 | $7700.00 | Window Closed / Lapsed |