Patent US2515224A successfully refreshed from Google Patents.
US2515224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective device for vacuum tubes
Assignee: Individual
•
Filing: 1945-09-24
•
Granted: 1950-07-18
•
Expires: 1965-09-24
Abstract
No abstract record available.
Inventors
- 👤 Holritz Clarence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:46
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1426826A
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US1857128A
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US2144995A
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US2153172A
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US2066943A
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US2113011A
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US2114828A
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US2228367A
Cited
US2392416A
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US2364687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |