US3197570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone subscriber sets using amplifiers
Assignee: International Standard Electric Corp
•
Filing: 1961-09-18
•
Granted: 1965-07-27
•
Expires: 1981-09-18
Abstract
No abstract record available.
Inventors
- 👤 Lambourn Edward Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:58
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M19/04; H04M1/00; H04M1/58; H04M1/585; H04M1/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A TRANSISTORIZED TELEPHONE SUBSET FOR ESTABLISHING AND RECEIVING TELEPHONE CALLS OVER A TELEPHONE LINE CONNECTED THERETO, COMPRISING A TRANSMITTER AND A RECEIVER FOR TRANSMITTING AND RECEIVING SPEECH SIGNALS OVER SAID LINE WHEN A TELEPHONE CALL IS IN PROGRESS, A LOUDSPEAKER FOR RECEIVING RINGING SIGNALS FROM SAID LINE WHEN SAID LINE IS BEING CALLED AND FOR PRODUCING AUDIBLE TONES IN ACCORDANCE THEREWITH, AMPLIFYING MEANS NORMALLY CONNECTED BETWEEN SAID LINE AND SAID LOUDSPEAKER, SELF BIASING MEANS IN SAID AMPLIFYING MEANS OPERATED RESPONSIVE TO OUTPUT SIGNALS FROM SAID AMPLIFYING MEANS FOR CAUSING SAID AMPLIFYING MEANS TO OPERATE AS A CLASS A AMPLIFIER IN AMPLIFYING SAID RINGING SIGNALS, AND HOOK SWITCH CONTROL MEANS OPERATED RESPONSIVE TO THE REMOVAL OF SAID SUBSET FOR DISCONNECTING SAID SELF BIASING MEANS AND FOR CONNECTING THE SAID AMPLIFYING MEANS TO AMPLIFY THE SAID TRANSMITTED SPEECH SIGNALS.
Claim 2
Dependent Claim
137 words
A TRANSISTORIZED TELEPHONE SUBSET FOR ESTABLISHING AND RECEIVING TELEPHONE CALLS OVER A TELEPHONE LINE CONNECTED THERETO, COMPRISING A TRANSMITTER AND A RECEIVER FOR TRANSMITTING AND RECEIVING SPEECH SIGNALS OVER SAID LINE WHEN A TELEPHONE CALL IS IN PROGRESS, A LOUDSPEAKER FOR RECEIVING RINGING SIGNALS FROM SAID LINE WHEN SAID LINE IS BEING CALLED AND FOR PRODUCING AUDIBLE TONES IN ACCORDANCE THEREWITH, AMPLIFYING MEANS NORMALLY CONNECTED BETWEEN SAID LINE AND SAID LOUDSPEAKER, SELF BIASING MEANS IN SAID AMPLIFYING MEANS OPERATED RESPONSIVE TO OUTPUT SIGNALS FROM SAID AMPLIFYING MEANS FOR CAUSING SAID AMPLIFYING MEANS TO OPERATE AS A CLASS A AMPLIFIER IN AMPLIFYING SAID RINGING SIGNALS, AND HOOK SWITCH CONTROL MEANS OPERATED RESPONSIVE TO THE REMOVAL OF SAID SUBSET FOR DISCONNECTING SAID SELF BIASING MEANS AND FOR CONNECTING THE SAID AMPLIFYING MEANS TO AMPLIFY THE SAID TRANSMITTED SPEECH SIGNALS.
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) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |