US3586786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlock for two asynchronous systems
Assignee: Automatic Electric Laboratories Inc
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Filing: 1969-06-20
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Granted: 1971-06-22
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Expires: 1989-06-20
Abstract
Abstract A telephone switching system matrix arrangement having two originating markers available to serve lines calling for service. Those portions of the two markers responsive to a call for service are shown and include an enabling interlock circuit. A part of this circuit is located in each marker. This circuit consists of a modified ring counter having two flip-flops in each marker that are operated by that marker''s clock. A decoding circuit in each marker is used to enable that marker upon the condition that only one of the two flip-flops is in the set condition.
Inventors
- 👤 Robert W Wolff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:34
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
An allotter comprising first equipment including a first source of timing pulses and second equipment including a second source of timing pulses, an endless cascade of four bistable switching stages with the signal obtained at the fourth stage inverted at the connection to the first stage, the first two of said four switching stages driven from said first timing pulse source and the second two of said four switching stages driven from said second timing pulse source, a decoding circuit connected to the outputs of said first two bistable switching stages operated to produce an output upon each of said first two stages being in a different stable state, to thereby enable said first equipment.
Claim 2
Dependent Claim
115 words
An allotter comprising first equipment including a first source of timing pulses and second equipment including a second source of timing pulses, an endless cascade of four bistable switching stages with the signal obtained at the fourth stage inverted at the connection to the first stage, the first two of said four switching stages driven from said first timing pulse source and the second two of said four switching stages driven from said second timing pulse source, a decoding circuit connected to the outputs of said first two bistable switching stages operated to produce an output upon each of said first two stages being in a different stable state, to thereby enable said first equipment.
Claim 3
Dependent Claim
47 words
An allotter as claimed in claim 1 including a second decoding circuit connected to the outputs of said second two bistable switching stages operated to produce an output upon each of said second two stages being in a different stable state to thereby enable said second equipment.
Claim 4
Dependent Claim
172 words
A communication switching system including a switching matrix and a first and a second marker each responsive to calls for service from said matrix, each having a source of timing pulses and including an interlock comprising: an endless cascade of four bistable switching stages with the signal obtained at the fourth stage inverted at the connection to the first stage, the first two of said four switching stages driven from said first marker timing pulse source and the second two of said four switching stages driven from said second marker timing pulse source, a first decoding cirCuit connected to the outputs of said first two bistable switching stages operated to produce an output upon each of said first two stages being in a different stable state, to thereby enable said first marker, and a second decoding circuit connected to the outputs of said second two bistable switching stages operated to produce an output upon each of said second two stages being in a different stable state to thereby enable said second marker.
Claim 5
Dependent Claim
172 words
A communication switching system including a switching matrix and a first and a second marker each responsive to calls for service from said matrix, each having a source of timing pulses and including an interlock comprising: an endless cascade of four bistable switching stages with the signal obtained at the fourth stage inverted at the connection to the first stage, the first two of said four switching stages driven from said first marker timing pulse source and the second two of said four switching stages driven from said second marker timing pulse source, a first decoding cirCuit connected to the outputs of said first two bistable switching stages operated to produce an output upon each of said first two stages being in a different stable state, to thereby enable said first marker, and a second decoding circuit connected to the outputs of said second two bistable switching stages operated to produce an output upon each of said second two stages being in a different stable state to thereby enable said second marker.
Claim 6
Dependent Claim
56 words
A communications switching system as claimed in claim 3 wherein the primary stage of said switching matrix is divided into a plurality of line subgroups, including individual call for service leads per subgroup, with each said marker including a corresponding plurality of access circuits, and means connecting said access circuits to corresponding call for service leads.
Claim 7
Dependent Claim
43 words
A communications switching system as claimed in claim 4 wherein each said marker includes means to mark only one particular one of said subgroups busy to said other marker during its association therewith, whereby the other subgroups may be accessed by another marker.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |