Patent US3189693A successfully refreshed from Google Patents.
US3189693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-to-4 wire converter
Assignee: TDK Micronas GmbH
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Filing: 1960-09-01
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Granted: 1965-06-15
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Expires: 1980-09-01
Abstract
No abstract record available.
Inventors
- 👤 Solly L Fudaley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:03
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/40; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/44; H04B1/46; H04B1/54; H04B1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A 2-TO-4 WIRE CONVERTER COMPRISING A TWO-WAY VOICE CHANNEL, A ONE-WAY OUTGOING VOICE CHANNEL, A ONE-WAY INCOMING VOICE CHANNEL, MEANS INCLUDING A FIRST TRANSISTOR FOR AMPLIFYING VOICE SIGNALS RECEIVED OVER SAID TWO-WAY CHANNEL, MEANS COUPLED TO AN OUTPUT ELECTRODE ON SAID FIRST TRANSISTOR FOR APPLYING SAID AMPLIFIED SIGNALS TO SAID OUTGOING CHANNEL, MEANS COMPRISING A PAIR OF PARALLEL CONNECTED CAPACITORS FOR SPLITTING VOICE SIGNALS RECEIVED OVER SAID INCOMING VOICE CHANNEL, MEANS INCLUDING ONE OF SAID CAPACITORS FOR APPLYING A FIRST OF SAID SPLIT SIGNALS TO SAID TWO-WAY CHANNEL, MEANS INCLUDING A SECOND TRANSISTOR COUPLED TO CONTROL THE BIAS ON A CONTROL ELECTRODE OF SAID FIRST TRANSISTOR, AND MEANS COMPRISING THE OTHER OF SAID CAPACITORS FOR APPLYING THE OTHER OF SAID SPLIT SIGNALS TO A CONTROL ELECTRODE OF SAID SECOND TRANSISTOR FOR CONTROLLING SAID BIAS TO PREVENT THE TRANSFER OF VOICE SIGNALS FROM SAID INCOMING VOICE CHANNEL TO SAID OUTGOING VOICE CHANNEL.
Claim 2
Dependent Claim
151 words
A 2-TO-4 WIRE CONVERTER COMPRISING A TWO-WAY VOICE CHANNEL, A ONE-WAY OUTGOING VOICE CHANNEL, A ONE-WAY INCOMING VOICE CHANNEL, MEANS INCLUDING A FIRST TRANSISTOR FOR AMPLIFYING VOICE SIGNALS RECEIVED OVER SAID TWO-WAY CHANNEL, MEANS COUPLED TO AN OUTPUT ELECTRODE ON SAID FIRST TRANSISTOR FOR APPLYING SAID AMPLIFIED SIGNALS TO SAID OUTGOING CHANNEL, MEANS COMPRISING A PAIR OF PARALLEL CONNECTED CAPACITORS FOR SPLITTING VOICE SIGNALS RECEIVED OVER SAID INCOMING VOICE CHANNEL, MEANS INCLUDING ONE OF SAID CAPACITORS FOR APPLYING A FIRST OF SAID SPLIT SIGNALS TO SAID TWO-WAY CHANNEL, MEANS INCLUDING A SECOND TRANSISTOR COUPLED TO CONTROL THE BIAS ON A CONTROL ELECTRODE OF SAID FIRST TRANSISTOR, AND MEANS COMPRISING THE OTHER OF SAID CAPACITORS FOR APPLYING THE OTHER OF SAID SPLIT SIGNALS TO A CONTROL ELECTRODE OF SAID SECOND TRANSISTOR FOR CONTROLLING SAID BIAS TO PREVENT THE TRANSFER OF VOICE SIGNALS FROM SAID INCOMING VOICE CHANNEL TO SAID OUTGOING VOICE CHANNEL.
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) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |