US3582564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for regulating the transmission and reception reference equivalent of a subscriber station in a telephone system
Assignee: International Standard Electric Corp
•
Filing: 1969-08-19
•
Granted: 1971-06-01
•
Expires: 1989-08-19
Abstract
Abstract Nonlinear networks in the form of semiconductor switches are employed for separate regulation of reception and transmission in a telephone system to compensate for variations in attenuation. Control of the transistors is made proportional to the voltage drop across separate resistors in the feed loop.
Inventors
- 👤 Hans-Ulrich Knauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:21
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/738; H04M1/74
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
56 words
A circuit arrangement as claimed in claim 1, in which each semiconductor switch is a transistor, means are provided for connecting the base-emitter circuit of each transistor to the associated low-resistance resistor in the feed loop and means are provided for shunting the collector-base circuit of each transistor across the associated electroacoustic transducer via a capacitor.
Claim 2
Dependent Claim
37 words
A circuit arrangement as claimed in claim 2, in which one terminal of the low-resistance resistor is always connected to the associated electroacoustic transducer and the base of the associated transistor is connected at that junction point.
Claim 3
Dependent Claim
21 words
A circuit arrangement as claimed in claim 1 in which the hybrid circuit in the subscriber station is a resistance hybrid.
Claim 4
Dependent Claim
20 words
A circuit arrangement as claimed in claim 4, in which the hybrid circuit and the balancing networks employ integrated circuits.
Claim 5
Dependent Claim
40 words
A circuit arrangement as claimed in claim 2 in which the low-resistance resistor for the control of the transistor is inserted in the feed loop on that side of the hybrid associated with or adjacent to the controlled electroacoustic transducer.
References Cited (Backward Citations)
US3350510A
Cited
US3462560A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |