US3603932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Party line stations for selective calling systems
Assignee: AT&T Inc
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Filing: 1969-04-07
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Granted: 1971-09-07
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Expires: 1989-04-07
Abstract
Abstract In a party line message distribution system, each station is arranged to provide a delayed response to a common polling or query code on a time division basis by inserting into a time slot individual thereto a response code indicating whether the station is prepared to receive a message. Each station includes an arrangement for modifying the delay to compensate for the delay of the transmission medium. When a station is designated to determine the delay modification, the station sends a test signal which is recirculated back to the station via the control station. The delay of the response is then reduced in accordance with the recirculating time.
Inventors
- 👤 Douglas A Kerr
- 👤 Bernard B Kolodner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:49
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0682; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/403; H04L43/00; H04L43/50
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
In a line station that acknowledges an incoming query signal by rEturning a response signal to the line after an adjustable delay interval, means for presetting a fixed delay interval, means for developing the adjustable delay interval to correspond to the difference between the fixed delay interval and a determinable interval, means for applying a test signal to the line, and means for determining the determinable interval to correspond to the interval between the application of the test signal to the line and the reception of the test signal after recirculation back from a remote station, the said means for developing the adjustable delay interval comprising a downcounter, the presetting means including means for inserting into the downcounter a fixed count designating the fixed delay interval, the downcounter being operated to down count from the fixed count by the means for determining the determinable interval to thereby obtain a count corresponding to the adjustable delay interval.
Claim 2
Dependent Claim
156 words
In a line station that acknowledges an incoming query signal by rEturning a response signal to the line after an adjustable delay interval, means for presetting a fixed delay interval, means for developing the adjustable delay interval to correspond to the difference between the fixed delay interval and a determinable interval, means for applying a test signal to the line, and means for determining the determinable interval to correspond to the interval between the application of the test signal to the line and the reception of the test signal after recirculation back from a remote station, the said means for developing the adjustable delay interval comprising a downcounter, the presetting means including means for inserting into the downcounter a fixed count designating the fixed delay interval, the downcounter being operated to down count from the fixed count by the means for determining the determinable interval to thereby obtain a count corresponding to the adjustable delay interval.
Claim 3
Dependent Claim
60 words
In a line station in accordance with claim 1 wherein the means for determining the determinable interval includes means for initiating the down count of the downcounter from the fixed count in response to the application of the test signal to the line and means for terminating the down count in response to the reception of the recirculated test signal.
Claim 4
Dependent Claim
65 words
In a line station in accordance with claim 1 wherein there is included further downcounting means arranged to have the adjustable delay interval count inserted therein, means to operate the further downcounter means to down count in response to the incoming query signal and means for returning the response signal to the line upon the advance of the further downcounter means to the zero count.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |