US3140358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical signalling system
Assignee: International Standard Electric Corp
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Filing: 1959-08-20
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Granted: 1964-07-07
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Expires: 1979-08-20
Abstract
No abstract record available.
Inventors
- 👤 Martens Jean Victor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:35
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/30; H04M1/50; H04M19/00; H04M19/02; H04M19/04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/446; H04Q1/4465; H04Q1/45; H04Q1/453; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A TELEPHONE SIGNALLING SYSTEM FOR SELECTIVELY TRANSMITTING VOICE FREQUENCY SIGNALS FROM A REMOTE STATION TO RECEIVING EQUIPMENT OVER A TWO-WIRE SIGNALLING LINE INTERCONNECTING SAID STATION AND SAID RECEIVING EQUIPMENT, SAID STATION INCLUDING VOICE FREQUENCY GENERATING MEANS HAVING A HIGH IMPEDANCE OUTPUT AND SAID RECEIVING EQUIPMENT INCLUDING VOICE FREQUENCY RESPONSIVE MEANS, SWITCHING MEANS IN SAID STATION FOR SELECTIVELY CONNECTING THE SAID HIGH IMPEDANCE OUTPUT OF SAID VOICE FREQUENCY GENERATING MEANS IN SERIES WITH THE WIRES OF SAID LINE TO TRANSMIT VOICE FREQUENCY SIGNALS OVER SAID LINE AND TO SUBSTANTIALLY INCREASE THE LOOP IMPEDANCE OF SAID LINE, AND SWITCHING MEANS IN SAID RECEIVING EQUIPMENT RESPONSIVE TO THE INCREASED LOOP RESISTANCE FOR CONNECTING SAID VOICE FREQUENCY RESPONSIVE MEANS TO SAID LINE.
Claim 2
Dependent Claim
118 words
A TELEPHONE SIGNALLING SYSTEM FOR SELECTIVELY TRANSMITTING VOICE FREQUENCY SIGNALS FROM A REMOTE STATION TO RECEIVING EQUIPMENT OVER A TWO-WIRE SIGNALLING LINE INTERCONNECTING SAID STATION AND SAID RECEIVING EQUIPMENT, SAID STATION INCLUDING VOICE FREQUENCY GENERATING MEANS HAVING A HIGH IMPEDANCE OUTPUT AND SAID RECEIVING EQUIPMENT INCLUDING VOICE FREQUENCY RESPONSIVE MEANS, SWITCHING MEANS IN SAID STATION FOR SELECTIVELY CONNECTING THE SAID HIGH IMPEDANCE OUTPUT OF SAID VOICE FREQUENCY GENERATING MEANS IN SERIES WITH THE WIRES OF SAID LINE TO TRANSMIT VOICE FREQUENCY SIGNALS OVER SAID LINE AND TO SUBSTANTIALLY INCREASE THE LOOP IMPEDANCE OF SAID LINE, AND SWITCHING MEANS IN SAID RECEIVING EQUIPMENT RESPONSIVE TO THE INCREASED LOOP RESISTANCE FOR CONNECTING SAID VOICE FREQUENCY RESPONSIVE MEANS TO SAID LINE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |