Patent US3775754A successfully refreshed from Google Patents.
US3775754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dial-operated data exchange system
Assignee: Individual
•
Filing: 1972-03-10
•
Granted: 1973-11-27
•
Expires: 1992-03-10
Abstract
Abstract A data exchange system of the dial-operated type having a central store to contain the operating relationships between the feeders and trunks of the system, and in which exchange functions are effected through special storage operations of the central store. The special storage operations are caused to be carried out between the read-out and write-in operations of a storage cycle, both to speed up operations and to prevent destruction of stored data by seizure of the system by a priority control unit.
Inventors
- 👤 H Auspurg
- 👤 H Moder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:37
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/14; G06F13/16; H; H04; H04L; H04L12/00; H04L12/50; H04L12/52; H04Q; H04Q3/00; H04Q3/42; H04Q3/54; H04Q3/545
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
293 words
In a dial-operated data exchange having a plurality of control units, each of which is connected to a feeder and a trunk, each of said control units having an assigned priority and including means for sending a demand signal responsive to a signal on the feeder connected thereto for establishing a connection with a central store, said central store containing information regarding operating relationships between said feeders and said trunks, said system including demand control means for producing a select signal responsive to a demand signal in accordance with its predetermined priority, at a given time, thereby selecting a given control unit emitting said demand signal having said predetermined priority and selector means for connecting said selected control unit to said central store responsive to said select signal, the improvement comprising: first and second register means, operations gate means for connecting a first information input terminal connected thereto to said central store through said first register means and for connecting a second information input terminal connected thereto through said second register means and said selector means to selected control unit for read and write operatIons, means in said control units for producing control signals indicating the type of special storage operation to be performed in said central store, additional control input terminals connected to said operations gate means and connected to receive control signals from the selected one of said control units, said operations gate means being constructed to complete the connections from said information input terminals for carrying out said special storage operations between read and write operations occurring within a storage cycle and output terminal means connecting the information output from said operations gate means both to said central store and through said first register means to said selected control unit.
Claim 2
Dependent Claim
293 words
In a dial-operated data exchange having a plurality of control units, each of which is connected to a feeder and a trunk, each of said control units having an assigned priority and including means for sending a demand signal responsive to a signal on the feeder connected thereto for establishing a connection with a central store, said central store containing information regarding operating relationships between said feeders and said trunks, said system including demand control means for producing a select signal responsive to a demand signal in accordance with its predetermined priority, at a given time, thereby selecting a given control unit emitting said demand signal having said predetermined priority and selector means for connecting said selected control unit to said central store responsive to said select signal, the improvement comprising: first and second register means, operations gate means for connecting a first information input terminal connected thereto to said central store through said first register means and for connecting a second information input terminal connected thereto through said second register means and said selector means to selected control unit for read and write operatIons, means in said control units for producing control signals indicating the type of special storage operation to be performed in said central store, additional control input terminals connected to said operations gate means and connected to receive control signals from the selected one of said control units, said operations gate means being constructed to complete the connections from said information input terminals for carrying out said special storage operations between read and write operations occurring within a storage cycle and output terminal means connecting the information output from said operations gate means both to said central store and through said first register means to said selected control unit.
Claim 3
Dependent Claim
223 words
The improved data exchange system defined in claim 1, the operations gate means further comprising: first, second and third AND gates and first, second and third OR gates and, wherein a first of said additional control inputs, selected by said write operation, controls said first AND gate through said first OR gate, the output of said first AND gate being connected to said third OR gate to pass information from said second information input terminal to said output terminal means without logic combination, wherein a second of said additional control inputs, selected by said read operation, controls said second AND gate through said second OR gate, the output of said second AND gate being connected to said third OR gate to pass information from said first information input terminal to said output terminal means without logic combination, wherein a third of said additional control inputs, selected by an operation command producing disjunctive combination, is connected through said first and second OR gates to open both said first and second AND gates, the outputs of said first and second AND gates being connected to inputs of said third OR gate and wherein a fourth of said additional control inputs, selected by an operation command producing conjunctive combination, controls directly said third AND gate, the output of which is connected to said third OR gate.
Claim 4
Dependent Claim
89 words
The improved data exchange system defined in claim 2 further comprising a fourth AND gate for completing a connection through said operations gate means for information contained in said central store or in said selected control unit and a further control input terminal connected to said operations gate means, said fourth AND gate having an input connected to said further control input and its other input connected to one of the first or second information input terminals supplying information from said central store or from said selected control unit.
Claim 5
Dependent Claim
24 words
The improved data exchange system defined in claim 1 further comprising clearing circuit means for connecting said output terminal means to said first register.
References Cited (Backward Citations)
US3029414A
Cited
US3116410A
Cited
US3245045A
Cited
US3237169A
Cited
US3377619A
Cited
US3389376A
Cited
US3454936A
Cited
US3517123A
Cited
US3591722A
Cited
US3660824A
Cited
US3685018A
Cited
US3711835A
Cited
US3717723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |