US3236948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple station communication network
Assignee: AT&T Inc
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Filing: 1962-06-29
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Granted: 1966-02-22
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Expires: 1982-06-29
Abstract
No abstract record available.
Inventors
- 👤 Monte Robert W De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:06
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IN A COMMUNICATION CIRCUIT FOR ESTABLISHING MULTIPLE CONNECTION BETWEEN SUBSCRIBERS, A TRANSMISSION LINE ADAPTED TO CARRY A PREDETERMINED BAND OF FREQUENCIES, MEANS TO CONNECT EACH OF THE SUBSCRIBER LINES TO SAID TRANSMISSION LINE, A TWO-TERMINAL NEGATIVE IMPEDANCE DEVICE CONNECTED TO SAID TRANSMISSION LINE, MEANS TO AUTOMATICALLY INCREASE THE SHUNT GAIN OF SAID NEGATIVE IMPEDANCE DEVICE AS EACH SUBSCRIBER LINE IS CONNECTED TO SAID TRANSMISSION LINE, AND MEANS TO AUTOMATICALLY REDUCE THE SHUNT GAIN OF SAID NEGATIVE IMPEDANCE DEVICE AS EACH SUBSCRIBER LINE IS DISCONNECTED FROM SAID TRANSMISSION LINE.
Claim 2
Dependent Claim
88 words
IN A COMMUNICATION CIRCUIT FOR ESTABLISHING MULTIPLE CONNECTION BETWEEN SUBSCRIBERS, A TRANSMISSION LINE ADAPTED TO CARRY A PREDETERMINED BAND OF FREQUENCIES, MEANS TO CONNECT EACH OF THE SUBSCRIBER LINES TO SAID TRANSMISSION LINE, A TWO-TERMINAL NEGATIVE IMPEDANCE DEVICE CONNECTED TO SAID TRANSMISSION LINE, MEANS TO AUTOMATICALLY INCREASE THE SHUNT GAIN OF SAID NEGATIVE IMPEDANCE DEVICE AS EACH SUBSCRIBER LINE IS CONNECTED TO SAID TRANSMISSION LINE, AND MEANS TO AUTOMATICALLY REDUCE THE SHUNT GAIN OF SAID NEGATIVE IMPEDANCE DEVICE AS EACH SUBSCRIBER LINE IS DISCONNECTED FROM SAID TRANSMISSION LINE.
References Cited (Backward Citations)
CA594844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |