Patent US2972924A successfully refreshed from Google Patents.
US1925076A
Expired / Lapsed
US
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Cleaning and regenerating compound for electronic tubes
Assignee: Individual
•
Filing: 1930-08-04
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Granted: 1933-08-29
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Expires: 1950-08-04
Abstract
No abstract record available.
Inventors
- 👤 Miller Henry Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
H; H01; H01J; H01J7/00; H01J7/14; H01J7/18; H01J7/183
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-08-28 | 1937-02-27 | 1937-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-08-28 | 1941-02-27 | 1941-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-08-28 | 1945-02-27 | 1945-08-29 | $7700.00 | Window Closed / Lapsed |