US3172953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitor circuit for frequency shift telegraph signaling
Assignee: —
•
Filing: —
•
Granted: 1965-03-09
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Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:02
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A SYSTEM FOR MONITORING A FIRST AND SECOND SUBCHANNEL OF FREQUENCY-SHIFT SIGNALS COMPRISING FIRST DISCRIMINATING MEANS RESPONSIVE TO SIGNALS IN SAID FIRST AND SECOND SUBCHANNELS, NORMALLY DISABLE SECOND DISCRIMINATING MEANS EFFECTIVE IN THE ABSENCE OF SIGNALS IN SAID FIRST SUBCHANNEL AND RESPONSIVE TO SIGNALS IN SAID SECOND SUBCHANNEL, NORMALLY DISABLED THIRD DISCRIMINATING MEANS SOLELY RESPONSIVE TO SIGNALS IN SAID SECOND SUBCHANNEL, MEANS FOR MONITORING THE OUTPUT OF SAID THIRD DISCRIMINATING MEANS, MEANS RESPONSIVE TO SAID RESPONSIVE FIRST DISCRIMINATING MEANS FOR ENABLING SAID SECOND DISCRIMINATING MEANS, AND MEANS RESPONSIVE TO SAID RESPONSIVE SECOND DISCRIMINATING MEANS FOR ENABLING SAID THIRD DISCRIMINATING MEANS.
Claim 2
Independent Claim
100 words
A SYSTEM FOR MONITORING A FIRST AND SECOND SUBCHANNEL OF FREQUENCY-SHIFT SIGNALS COMPRISING FIRST DISCRIMINATING MEANS RESPONSIVE TO SIGNALS IN SAID FIRST AND SECOND SUBCHANNELS, NORMALLY DISABLE SECOND DISCRIMINATING MEANS EFFECTIVE IN THE ABSENCE OF SIGNALS IN SAID FIRST SUBCHANNEL AND RESPONSIVE TO SIGNALS IN SAID SECOND SUBCHANNEL, NORMALLY DISABLED THIRD DISCRIMINATING MEANS SOLELY RESPONSIVE TO SIGNALS IN SAID SECOND SUBCHANNEL, MEANS FOR MONITORING THE OUTPUT OF SAID THIRD DISCRIMINATING MEANS, MEANS RESPONSIVE TO SAID RESPONSIVE FIRST DISCRIMINATING MEANS FOR ENABLING SAID SECOND DISCRIMINATING MEANS, AND MEANS RESPONSIVE TO SAID RESPONSIVE SECOND DISCRIMINATING MEANS FOR ENABLING SAID THIRD DISCRIMINATING MEANS.
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |