Patent US5392404A successfully refreshed from Google Patents.
US2528033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power rectifier tube
Assignee: Individual
•
Filing: 1946-07-16
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Granted: 1950-10-31
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Expires: 1966-07-16
Abstract
No abstract record available.
Inventors
- 👤 Dudley B Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:52
CPC Classifications
H; H01; H01J; H01J13/00; H01J13/02; H01J13/04; H01J13/06; H01J13/10; H01J2893/00; H01J2893/0072; H01J2893/0073; H01J2893/0074; H01J2893/0075; H01J2893/0077; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/12229; Y10T428/12236; Y10T428/12243; Y10T428/1225; Y10T428/12479
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) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |