US3267387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature and frequency stable amplifier
Assignee: Ampex Corp
•
Filing: 1964-02-06
•
Granted: 1966-08-16
•
Expires: 1984-02-06
Abstract
No abstract record available.
Inventors
- 👤 Michael O Felix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:44
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/26; H03F3/00; H03F3/45; H03F3/45071; H03F3/45479
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A TRANSISTOR AMPLIFIER CIRCUIT COMPRISING: A FIRST TRANSISTOR OF THE GERMANIUM TYPE HAVING EMITTER, BASE, AND COLLECTOR, THE BASE OF THE FIRST TRANSISTOR BEING COUPLED TO RECEIVE SIGNALS TO BE AMPLIFIED BY THE CIRCUIT, A SECOND TRANSISTOR OF THE SILICON TYPE, OF THE OPPOSITE CONDUCTIVITY TYPE OF THE FIRST TRANSISTOR, AND HAVING EMITTER, BASE, AND
Claim 2
Dependent Claim
55 words
A TRANSISTOR AMPLIFIER CIRCUIT COMPRISING: A FIRST TRANSISTOR OF THE GERMANIUM TYPE HAVING EMITTER, BASE, AND COLLECTOR, THE BASE OF THE FIRST TRANSISTOR BEING COUPLED TO RECEIVE SIGNALS TO BE AMPLIFIED BY THE CIRCUIT, A SECOND TRANSISTOR OF THE SILICON TYPE, OF THE OPPOSITE CONDUCTIVITY TYPE OF THE FIRST TRANSISTOR, AND HAVING EMITTER, BASE, AND
References Cited (Backward Citations)
US2794076A
Cited
US2852625A
Cited
US2936427A
Cited
US3192483A
Cited
US2963656A
Cited
US3200343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |