Patent US2516533A successfully refreshed from Google Patents.
US2516533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical circuit
Assignee: Individual
•
Filing: 1945-04-07
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Granted: 1950-07-25
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Expires: 1965-04-07
Abstract
No abstract record available.
Inventors
- 👤 Frederick F Slack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:11
CPC Classifications
H; H03; H03K; H03K25/00; H03B; H03B19/00; H03B19/06; H03B19/08; H03B19/12
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) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |