US3099720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Translator checking circuit for telephone switching system
Assignee: AT&T Inc
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Filing: 1960-12-29
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Granted: 1963-07-30
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Expires: 1980-12-29
Abstract
No abstract record available.
Inventors
- 👤 Manfred R Gotthardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:22
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A CHECKING CIRCUIT FOR A TRANSLATOR HAVING A COMMON INPUT TERMINAL AND A PLURALITY OF OUTPUT TERMINALS WITH ONLY ONE OF SAID OUTPUT TERMINALS CONNECTED TO SAID INPUT TERMINAL UPON PROPER OPERATION OF SAID TRANSLATOR COMPRISING LOAD RESISTANCE MEANS CONNECTED TO EACH OF SAID OUTPUT TERMINALS, CONSTANT CURRENT MEANS CONNECTED TO SAID INPUT TERMINAL FOR DEVELOPING A VOLTAGE AT SAID INPUT TERMINAL INVERSELY PROPORTIONAL TO THE NUMBER OF SAID RESISTANCE MEANS CONNECTED TO SAID INPUT TERMINAL THROUGH SAID TRANSLATOR, FIRST ALERTING MEANS CONNECTED TO SAID INPUT TERMINAL AND RESPONSIVE TO SAID DEVELOPED VOLTAGE AT SAID INPUT TERMINAL EXCEEDING A FIRST PREDETERMINED VALUE FOR INDICATING THE CONNECTION OF AT MOST ONE OF SAID OUTPUT TERMINALS TO SAID INPUT TERMINAL, AND SECOND ALERTING MEANS CONNECTED TO SAID INPUT TERMINAL AND RESPONSIVE TO SAID VOLTAGE EXCEEDING A SECOND PREDETERMINED VALUE FOR INDICATING THE CONNECTION OF NONE OF SAID OUTPUT TERMINALS TO SAID INPUT TERMINAL.
Claim 2
Dependent Claim
151 words
A CHECKING CIRCUIT FOR A TRANSLATOR HAVING A COMMON INPUT TERMINAL AND A PLURALITY OF OUTPUT TERMINALS WITH ONLY ONE OF SAID OUTPUT TERMINALS CONNECTED TO SAID INPUT TERMINAL UPON PROPER OPERATION OF SAID TRANSLATOR COMPRISING LOAD RESISTANCE MEANS CONNECTED TO EACH OF SAID OUTPUT TERMINALS, CONSTANT CURRENT MEANS CONNECTED TO SAID INPUT TERMINAL FOR DEVELOPING A VOLTAGE AT SAID INPUT TERMINAL INVERSELY PROPORTIONAL TO THE NUMBER OF SAID RESISTANCE MEANS CONNECTED TO SAID INPUT TERMINAL THROUGH SAID TRANSLATOR, FIRST ALERTING MEANS CONNECTED TO SAID INPUT TERMINAL AND RESPONSIVE TO SAID DEVELOPED VOLTAGE AT SAID INPUT TERMINAL EXCEEDING A FIRST PREDETERMINED VALUE FOR INDICATING THE CONNECTION OF AT MOST ONE OF SAID OUTPUT TERMINALS TO SAID INPUT TERMINAL, AND SECOND ALERTING MEANS CONNECTED TO SAID INPUT TERMINAL AND RESPONSIVE TO SAID VOLTAGE EXCEEDING A SECOND PREDETERMINED VALUE FOR INDICATING THE CONNECTION OF NONE OF SAID OUTPUT TERMINALS TO SAID INPUT TERMINAL.
Claim 3
Dependent Claim
67 words
A CIRCUIT FOR CHECKING WHETHER THE INPUT RESISTANCE BETWEEN A REFERENCE POTENTIAL AND A TERMINAL LIES WITHIN FIRST AND SECOND PREDETERMINED VALUES COMPRISING CURRENT SOURCE MEANS CONNECTED BETWEEN SAID REFERENCE POTENTIAL AND SAID TERMINAL FOR CONTROLLING A CURRENT FLOW FROM SAID SOURCE THROUGH SAID RESISTANCE TO SAID REFERENCE POTENTIAL, FIRST ZENER DIODE MEANS CONNECTED TO SAID TERMINAL AND POLED TO CONDUCT CURRENT IN THE BREAKDOWN CONDITION IN
Claim 4
Dependent Claim
67 words
A CIRCUIT FOR CHECKING WHETHER THE INPUT RESISTANCE BETWEEN A REFERENCE POTENTIAL AND A TERMINAL LIES WITHIN FIRST AND SECOND PREDETERMINED VALUES COMPRISING CURRENT SOURCE MEANS CONNECTED BETWEEN SAID REFERENCE POTENTIAL AND SAID TERMINAL FOR CONTROLLING A CURRENT FLOW FROM SAID SOURCE THROUGH SAID RESISTANCE TO SAID REFERENCE POTENTIAL, FIRST ZENER DIODE MEANS CONNECTED TO SAID TERMINAL AND POLED TO CONDUCT CURRENT IN THE BREAKDOWN CONDITION IN
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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) | 1966-07-29 | 1967-01-28 | 1967-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-29 | 1971-01-28 | 1971-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-29 | 1975-01-28 | 1975-07-30 | $7700.00 | Window Closed / Lapsed |