US3504293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier apparatus including field effect and bipolar transistors suitable for integration
Assignee: Westinghouse Electric Corp
•
Filing: 1968-02-29
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Granted: 1970-03-31
•
Expires: 1988-02-29
Abstract
No abstract record available.
Inventors
- 👤 Hung Chang Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:55
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3069; H03F3/3071; H03F3/3072; H03F3/3001; H03F3/3008; H03F3/34; H03F3/343; H03F3/345
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3070762A
Cited
US3400335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-30 | 1973-09-29 | 1974-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-30 | 1977-09-29 | 1978-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-30 | 1981-09-29 | 1982-03-31 | $7700.00 | Window Closed / Lapsed |