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Patent US3428908A successfully refreshed from Google Patents.
US3428908A
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Multi-stage,direct-coupled transistor amplifier having complementary symmetry
Assignee: Harman Professional Inc
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Filing: 1966-02-03
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Granted: 1969-02-18
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Expires: 1986-02-03
Abstract
No abstract record available.
Inventors
- 👤 Bart N Locanthi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:24
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F3/00; H03F3/30; H03F3/3069; H03F3/3076
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) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |