US2947946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic switch-amplifiers
Assignee: International Standard Electric Corp
•
Filing: 1954-02-15
•
Granted: 1960-08-02
•
Expires: 1974-02-15
Abstract
No abstract record available.
Inventors
- 👤 Grayson Harry
- 👤 Dunkley Rowald Arthur George
- 👤 Walker Thomas Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:45
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/45; H03K3/49; H03K17/00; H03K17/51; H03K17/80; H03K23/00; H03K23/76; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2164383A
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US2108642A
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US2218711A
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US2585332A
Cited
US2548049A
Cited
US2548176A
Cited
US2585654A
Cited
US2650986A
Cited
US2853693A
Cited
US2850725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |