US3047742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor amplifier system for an inductive load with transistor protection means
Assignee: Cutler Hammer Inc
•
Filing: 1959-08-17
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Granted: 1962-07-31
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Expires: 1979-08-17
Abstract
No abstract record available.
Inventors
- 👤 Donald J Greening
- 👤 Charles E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:53
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H02; H02H; H02H9/00; H02H9/005
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) | 1965-07-30 | 1966-01-29 | 1966-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-30 | 1970-01-29 | 1970-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-30 | 1974-01-29 | 1974-07-31 | $7700.00 | Window Closed / Lapsed |