US3862372A
Expired / Lapsed
US
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Branch exchange including electronic timer
Assignee: TELE RESOURCE Inc
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Filing: 1973-07-02
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Granted: 1975-01-21
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Expires: 1993-07-02
Abstract
Abstract An electronic timer includes a recirculating memory in which binary timer numbers can be recorded and a counter for incrementing the timer number when required as it recirculates. A comparator receives the output of the timer number and a time base signal of varying polarity. A gate means responsive to the output of the comparator causes the counter to increase the timer number each time the phase of the time base signal changes. When the timer number reaches a predetermined magnitude, a time elapse gate so indicates. Various time base signals having different pulse rates may be selected, depending upon the interval to be measured. This timer may be incorporated in a telephony exchange in which the timer memory is part of the connection memory.
Inventors
- 👤 Herman Deutsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:14
CPC Classifications
G; G04; G04F; G04F10/00; G04F10/04; H; H04; H04J; H04J3/00; H04J3/02; H04J3/04; H04J3/047; H04M; H04M3/00; H04M3/42; H04M3/56; H04M3/561; H04M3/58; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
206 words
A time division multiplex branch exchange for a telephony system comprising: a multiplicity of sets of binary storage elements that form a recirculating temporary memory, each set forming an address portion and a timer portion; means for loading the addresses assigned to equipment that may be interconnected through a common time slot into the address portions of each set of storage elements; time division switch means responsive to said temporary memory for gating an audio connection between equipment assigned the addresses that appear simultaneously in one set of storage elements; counter means for periodically incrementing the contents of each timer portion in sequence; selector means for selecting a time base signal of varying polarity having a pulse rate corresponding to the condition of the connection associated with a particular time slot; comparator means for comparing the output of the counter means with the polarity of the selected time base signal; fIrst gate means for causing the counter means to increase the corresponding recorded number each time the selected time base signal changes polarity; and second gate means for sensing when a recorded binary number contained in a timer portion has reached a predetermined magnitude and producing an output to indicate that a time interval has elapsed.
Claim 2
Dependent Claim
206 words
A time division multiplex branch exchange for a telephony system comprising: a multiplicity of sets of binary storage elements that form a recirculating temporary memory, each set forming an address portion and a timer portion; means for loading the addresses assigned to equipment that may be interconnected through a common time slot into the address portions of each set of storage elements; time division switch means responsive to said temporary memory for gating an audio connection between equipment assigned the addresses that appear simultaneously in one set of storage elements; counter means for periodically incrementing the contents of each timer portion in sequence; selector means for selecting a time base signal of varying polarity having a pulse rate corresponding to the condition of the connection associated with a particular time slot; comparator means for comparing the output of the counter means with the polarity of the selected time base signal; fIrst gate means for causing the counter means to increase the corresponding recorded number each time the selected time base signal changes polarity; and second gate means for sensing when a recorded binary number contained in a timer portion has reached a predetermined magnitude and producing an output to indicate that a time interval has elapsed.
Claim 3
Dependent Claim
25 words
The apparatus of claim 1, wherein each set of storage elements also includes a tag portion for indicating the time base signal to be selected.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |