US3618082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information retrieval system with a remote station hold circuit to preserve a double change in status
Assignee: Honeywell Inc
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Filing: 1969-04-09
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Granted: 1971-11-02
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Expires: 1989-04-09
Abstract
Abstract An information retrieval system having a central processor unit which is connected over a transmission circuit to a plurality of remote stations wherein the status of any one of the remote stations which has a change in status can be indicated or read out at the central processor unit. Each remote station has means for preserving a second change in status signal at a remote station until a first change in status is acknowledged by the central processor.
Inventors
- 👤 Roger J Feulner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:12
CPC Classifications
G; G08; G08B; G08B26/00; G08B26/001; G08B26/002
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
194 words
A system comprising: a plurality of remote stations each comprising: condition-responsive means operable between a first and second status and between said second and said first status, latching circuit means connected to said condition-responsive means for providing an output signal upon an operation of said condition-responsive means from one status to the other, hold circuit means connecting said latching circuit means to said condition-responsive means for selectively rendering said latching circuit means nonresponsive to a second operation of said condition-responsive means from said other status to said one status after first operating from said one to said other status to produce said output signal, transmission circuit means: a central position comprising: scanning circuit means connecting said central station to each of said remote stations over said transmission circuit means, and status-responsive means, circuit means including said scanning circuit means and said transmission circuit means for connecting said statusresponsive means to said condition-responsive means of the remote station having said output signal to have said central station respond to the status of said condition-responsive means, and control circuit means at said remote station connected to said hold circuit means for controlling said hold circuit means.
Claim 2
Independent Claim
194 words
A system comprising: a plurality of remote stations each comprising: condition-responsive means operable between a first and second status and between said second and said first status, latching circuit means connected to said condition-responsive means for providing an output signal upon an operation of said condition-responsive means from one status to the other, hold circuit means connecting said latching circuit means to said condition-responsive means for selectively rendering said latching circuit means nonresponsive to a second operation of said condition-responsive means from said other status to said one status after first operating from said one to said other status to produce said output signal, transmission circuit means: a central position comprising: scanning circuit means connecting said central station to each of said remote stations over said transmission circuit means, and status-responsive means, circuit means including said scanning circuit means and said transmission circuit means for connecting said statusresponsive means to said condition-responsive means of the remote station having said output signal to have said central station respond to the status of said condition-responsive means, and control circuit means at said remote station connected to said hold circuit means for controlling said hold circuit means.
Claim 3
Dependent Claim
30 words
In the system of claim 1 wherein, said latching circuit means provides a change of status output signal when said condition-responsive means operates from said one status to said other.
Claim 4
Dependent Claim
66 words
In the system of claim 1 wherein, said latching circuit means comprising a resettable latching circuit means for providing said change of status output signal when energized to a latched state, and comprising; circuit means associated with said scanning circuit means for providing a reset signal for unlatching said latching circuit means after the status responsive means has responded to the status of said condition-responsive means.
Claim 5
Dependent Claim
129 words
The system of claim 1 wherein said condition-responsive means comprises detector means having a first and second state of operation, said latching circuit means having a first and second state of operation corresponding to said first and second state of operation of said detector means, having an output signal upon said latching circuit means changing from one state to the other, and having circuit means connected to said hold circuit means to hold said latching circuit means in a state of operation upon the occurrence of said output signal, and said control means being controlled by said scanning means and effective to control said hold circuit means to hold said latching circuit means after the state of said detector means has been responded to by said status responsive means.
Claim 6
Dependent Claim
124 words
In the system of claim 1 wherein: said hold circuit means comprising: a pair of NAND gates each having two input circuits and an output circuit, a signal source, and means connecting said condition-responsive means to one input of one of said NAND gates and connecting said condition-responsive means to one input of the other of said NAND gates through an inverter means to provide a signal on said output when said condition-responsive means operates to one status, and wherein said hold circuit means comprises: means connecting said second input circuits of each of said NAND gates to said signal source to render said hold circuit means effective to prevent a change of said signal on said output until said signal source is removed.
Claim 7
Dependent Claim
63 words
In the system of claim 6 wherein, said latching circuit means has a flip-flop circuit and a latching circuit connected to said output of said pair of NAND gates whereby upon said condition-responsive means first changing status, the signal on said output of said pair of NAND gates changes to operate said flip-flop circuit and said latching circuit to provide said output signal.
Claim 8
Dependent Claim
101 words
The system of claim 1 wherein said scanning means of said central station scans said plurality of remote stations to respond to a station having an output signal indicating a change of status of said condition-responsive means and after said status-responsive means responds to said status of said condition-responsive means, said central station energizes said control circuit means to render said hold circuit means ineffective whereby if a second change of status had taken place a subsequent output signal is produced whereby said central station responds to said subsequent output signal indicating a subsequent change in status of said condition-responsive means.
Claim 9
Dependent Claim
37 words
In the system of claim 1 wherein, said hold circuit means is connected to said latching circuit means to respond to an output signal upon said condition-responsive means operating from said one status to said other status.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |