US4010385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiplexing circuitry for time sharing a common conductor
Assignee: AT&T Teletype Corp
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Filing: 1976-01-09
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Granted: 1977-03-01
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Expires: 1996-01-09
Abstract
Abstract A multiplexing circuit includes a plurality of passive circuit networks having a multiphase clocking signal associated therewith to selectively enable transmission of information signals over a common conductor. Each passive circuit network is enabled during a distinct phase of the multiphase clocking signal to provide a distinct circuit path for transmission of information signals with each distinct path including the common conductor. The enabling of the passive circuit networks by the multiphase clocking signal allows time sharing of the common conductor.
Inventors
- 👤 William S. Krol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:14
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/04; H04J3/047
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
155 words
A multiplexing circuit for time sharing signals over a common conductor comprising: a plurality of individual passive circuit paths each having a predetermined resistance characteristic with one end of each circuit path being connected to a common conductor; a plurality of sampling circuits each corresponding to one of said passive circuit paths, each of said sampling circuits being connected to said common conductor; means for applying a distinct phase of a multiphase clock signal to each of said passive circuit paths for coupling to said common conductor and for applying the same phase of said multiphase clock signal to the corresponding sampling circuit; and a selectively operable switch connected in series with each of said passive circuit paths for interrupting the coupling of the associated clock phase to the common conductor so that each of the sampling means will provide a signal related to the condition of the switch in its corresponding passive circuit path.
Claim 2
Dependent Claim
155 words
A multiplexing circuit for time sharing signals over a common conductor comprising: a plurality of individual passive circuit paths each having a predetermined resistance characteristic with one end of each circuit path being connected to a common conductor; a plurality of sampling circuits each corresponding to one of said passive circuit paths, each of said sampling circuits being connected to said common conductor; means for applying a distinct phase of a multiphase clock signal to each of said passive circuit paths for coupling to said common conductor and for applying the same phase of said multiphase clock signal to the corresponding sampling circuit; and a selectively operable switch connected in series with each of said passive circuit paths for interrupting the coupling of the associated clock phase to the common conductor so that each of the sampling means will provide a signal related to the condition of the switch in its corresponding passive circuit path.
Claim 3
Dependent Claim
51 words
The multiplexing circuit of claim 1 which further includes a common resistor coupled to said common conductor and to the common terminal of said multiphase clock signal applying means so that the predetermined resistance characteristic of each of said passive circuit paths forms a voltage dividing network with said common resistor.
Claim 4
Dependent Claim
16 words
The multiplexing circuit of claim 2 wherein each of said passive circuit paths includes a diode.
Claim 5
Dependent Claim
132 words
A multiplexing circuit for time sharing a common conductor comprising: a plurality of means for generating signals to be transmitted over the common conductor; a plurality of passive circuit paths each of which corresponds to one of the generating means with one end of each passive circuit path being connected to said common conductor; means for applying a distinct phase of multiphase clock signal to each of said generating means for selective enablement thereof and for applying the same phase of said multiphase clock signal to the corresponding passive circuit path; and each of said passive circuit paths including a resistor and a light emitting diode in series connection, the light emitting diode providing a suitable indication in response to a signal from the corresponding generating means during the related clock phase.
Claim 6
Dependent Claim
132 words
A multiplexing circuit for time sharing a common conductor comprising: a plurality of means for generating signals to be transmitted over the common conductor; a plurality of passive circuit paths each of which corresponds to one of the generating means with one end of each passive circuit path being connected to said common conductor; means for applying a distinct phase of multiphase clock signal to each of said generating means for selective enablement thereof and for applying the same phase of said multiphase clock signal to the corresponding passive circuit path; and each of said passive circuit paths including a resistor and a light emitting diode in series connection, the light emitting diode providing a suitable indication in response to a signal from the corresponding generating means during the related clock phase.
References Cited (Backward Citations)
US2928900A
Cited
US3515905A
Cited
US3601634A
Cited
US3641366A
Cited
US3719832A
Cited
US3935385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |