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Patent US2565497A successfully refreshed from Google Patents.
US2565497A
Expired / Lapsed
US
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Circuit, including negative resistance device
Assignee: International Standard Electric Corp
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Filing: 1949-07-21
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Granted: 1951-08-28
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Expires: 1969-07-21
Abstract
No abstract record available.
Inventors
- 👤 Harling John West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:15
CPC Classifications
H; H03; H03B; H03B7/00; H03B7/02; H03B7/06; H03K; H03K3/00; H03K3/02; H03K3/313
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) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |