Patent US4323738A successfully refreshed from Google Patents.
US4323738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable telephone line test set
Assignee: OROS CORP
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Filing: 1980-04-10
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Granted: 1982-04-06
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Expires: 2000-04-10
Abstract
Abstract A portable two wire line test set having a self-contained source of electrical energy for powering a hybrid circuit and first and second amplifier means. The first amplifier receives and amplifies voice signals transmitted over the two wire line and the second amplifier amplifies and transmits voice signals over the two wire line. Transducer means are connected to both amplifiers to convert signals to audible sounds and vice versa. In an alternative embodiment a third tuned amplifier means is included for detecting and amplifying a signal in a predetermined frequency range so that the identity and condition of particular two wire lines may be determined.
Inventors
- 👤 Llewellyn S. Merrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:13
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/26; H04M3/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
104 words
A portable two wire line test set comprising: (a) power supply means for providing electrical energy; (b) hybrid circuit means for connecting to a telephone line; (c) first amplifier means connected to said power supply means and to said hybrid circuit means for receiving and amplifying voice signals; (d) second amplifier means connectable to said power supply means and to said hybrid circuit means for amplifying and transmitting voice signals; (e) transducer means connected to said first amplifier means for converting said voice signals into audible sounds; and (f) transducer means connected to said second amplifier means for converting audible sound into voice signals.
Claim 2
Dependent Claim
104 words
A portable two wire line test set comprising: (a) power supply means for providing electrical energy; (b) hybrid circuit means for connecting to a telephone line; (c) first amplifier means connected to said power supply means and to said hybrid circuit means for receiving and amplifying voice signals; (d) second amplifier means connectable to said power supply means and to said hybrid circuit means for amplifying and transmitting voice signals; (e) transducer means connected to said first amplifier means for converting said voice signals into audible sounds; and (f) transducer means connected to said second amplifier means for converting audible sound into voice signals.
Claim 3
Dependent Claim
69 words
A test set in accordance with claim 1 further comprising: (a) tuned amplifier means connectable to said power supply means and connectable to said first amplifying means for amplifying a signal in a predetermined frequency range; and (b) means for connecting a signal to said tuned amplifier means whereby identifying tones on particular two wire lines are made audible when said tuned amplifier is connected to said first amplifier.
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) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |