US3146313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier arrangement for loudspeaking telephones
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1962-05-31
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Granted: 1964-08-25
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Expires: 1982-05-31
Abstract
No abstract record available.
Inventors
- 👤 Ulin Lars Gunnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:30
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/08; H04M9/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
204 words
AN AMPLIFIER SYSTEM FOR USE IN LOUDSPEAKING TELEPHONES, SAID SYSTEM COMPRISING A FIRST AMPLIFIER FOR AMPLIFICATION OF OUTGOING SPEECH SIGNALS FROM THE MICROPHONE OF THE TELEPHONE AND INTENDED FOR TRANSMISSION OVER A TWO-WIRE LINE; A SECOND AMPLIFIER FOR AMPLIFICATION OF SPEECH SIGNALS INTENDED FOR THE LOUDSPEAKER OF THE TELEPHONE AND COMING FROM THE TWO-WIRE LINE; A CURRENTCONTROLLED FIRST ATTENUATION CIRCUIT INCLUDING A CURRENTCONTROL CIRCUIT, SAID ATTENUATION CIRCUIT DURING OPERATION OF THE SYSTEM AFFECTING THE AMPLIFICATION OF SAID OUTGOING SPEECH SIGNALS AND BEING ATTENUATING DURING THE REST CONDITION OF THE FIRST AMPLIFIER WHEN SAID AMPLIFIER IS CONNECTED BUT IS NOT BEING FED WITH SPEECH SIGNALS; A CURRENTCONTROLLED SECOND ATTENUATION CIRCUIT INCLUDING A CURRENTCONTROL CIRCUIT, SAID SECOND ATTENUATION CIRCUIT DURING OPERATION OF THE SYSTEM AFFECTING THE AMPLIFICATION OF SAID INCOMING SPEECH SIGNALS AND BEING ATTENUATING DURING THE REST CONDITION OF THE SECOND AMPLIFIER; A THIRD CURRENTCONTROLLED ATTENUATION CIRCUIT INCLUDING A CURRENT-CONTROL CIRCUIT, SAID THIRD ATTENUATION CIRCUIT DURING OPERATION OF THE SYSTEM AFFECTING THE AMPLIFICATION OF SAID OUTGOING SPEECH SIGNALS AND BEING ONLY SLIGHTLY ATTENUATING DURING THE REST CONDITION OF SAID FIRST AMPLIFIER; A FOURT CURRENTCONTROLLED ATTENUATION CIRCUIT INCLUDING A CURRENT-CONTROL CIRCUIT, SAID FOURTH ATTENUATION CIRCUIT DURING OPERATION OF THE SYSTEM AFFECTING THE AMPLIFICATION OF SAID INCOMING
Claim 2
Dependent Claim
204 words
AN AMPLIFIER SYSTEM FOR USE IN LOUDSPEAKING TELEPHONES, SAID SYSTEM COMPRISING A FIRST AMPLIFIER FOR AMPLIFICATION OF OUTGOING SPEECH SIGNALS FROM THE MICROPHONE OF THE TELEPHONE AND INTENDED FOR TRANSMISSION OVER A TWO-WIRE LINE; A SECOND AMPLIFIER FOR AMPLIFICATION OF SPEECH SIGNALS INTENDED FOR THE LOUDSPEAKER OF THE TELEPHONE AND COMING FROM THE TWO-WIRE LINE; A CURRENTCONTROLLED FIRST ATTENUATION CIRCUIT INCLUDING A CURRENTCONTROL CIRCUIT, SAID ATTENUATION CIRCUIT DURING OPERATION OF THE SYSTEM AFFECTING THE AMPLIFICATION OF SAID OUTGOING SPEECH SIGNALS AND BEING ATTENUATING DURING THE REST CONDITION OF THE FIRST AMPLIFIER WHEN SAID AMPLIFIER IS CONNECTED BUT IS NOT BEING FED WITH SPEECH SIGNALS; A CURRENTCONTROLLED SECOND ATTENUATION CIRCUIT INCLUDING A CURRENTCONTROL CIRCUIT, SAID SECOND ATTENUATION CIRCUIT DURING OPERATION OF THE SYSTEM AFFECTING THE AMPLIFICATION OF SAID INCOMING SPEECH SIGNALS AND BEING ATTENUATING DURING THE REST CONDITION OF THE SECOND AMPLIFIER; A THIRD CURRENTCONTROLLED ATTENUATION CIRCUIT INCLUDING A CURRENT-CONTROL CIRCUIT, SAID THIRD ATTENUATION CIRCUIT DURING OPERATION OF THE SYSTEM AFFECTING THE AMPLIFICATION OF SAID OUTGOING SPEECH SIGNALS AND BEING ONLY SLIGHTLY ATTENUATING DURING THE REST CONDITION OF SAID FIRST AMPLIFIER; A FOURT CURRENTCONTROLLED ATTENUATION CIRCUIT INCLUDING A CURRENT-CONTROL CIRCUIT, SAID FOURTH ATTENUATION CIRCUIT DURING OPERATION OF THE SYSTEM AFFECTING THE AMPLIFICATION OF SAID INCOMING
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) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |