Patent US3586879A successfully refreshed from Google Patents.
US3586879A
Expired / Lapsed
US
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Discriminator circuit
Assignee: Individual
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Filing: 1968-10-10
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Granted: 1971-06-22
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Expires: 1988-10-10
Abstract
Abstract Two normally nonconducting transistors are connected across an input, both being held nonconducting by Zener diodes in their base circuits. Values of Zener voltages prevent an output from one transistor until a minimum input voltage level is reached, and after a selected maximum input voltage level is reached, whereby a circuit output is available for a range of input voltages within selected limits.
Inventors
- 👤 Donald L Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:38
CPC Classifications
H; H03; H03B; H03B19/00; H03B19/16; H03B19/06; H03B19/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
154 words
A discriminator comprising: firsT and second input conductors; a first transistor having a load circuit path and a control circuit path therein, said control circuit path being in a first series circuit combination with a first Zener diode and first impedance means, said first combination being connected across said input conductors; a second transistor having a load circuit path and a control circuit path therein, said control circuit path thereof being in a second series circuit combination including a second Zener diode and second impedance means, said second combination being connected across said input conductors; the load circuit path of said first transistor being connected in a third series circuit combination with third impedance means, said third combination being connected across said input conductors; and the load circuit path of said second transistor being in a fourth series circuit combination including said first impedance means, said fourth combination being connected across said input conductors.
Claim 2
Dependent Claim
154 words
A discriminator comprising: firsT and second input conductors; a first transistor having a load circuit path and a control circuit path therein, said control circuit path being in a first series circuit combination with a first Zener diode and first impedance means, said first combination being connected across said input conductors; a second transistor having a load circuit path and a control circuit path therein, said control circuit path thereof being in a second series circuit combination including a second Zener diode and second impedance means, said second combination being connected across said input conductors; the load circuit path of said first transistor being connected in a third series circuit combination with third impedance means, said third combination being connected across said input conductors; and the load circuit path of said second transistor being in a fourth series circuit combination including said first impedance means, said fourth combination being connected across said input conductors.
Claim 3
Dependent Claim
59 words
The discriminator of claim 1 wherein: said first Zener diode is oriented to normally prevent forward biasing current flow in the control circuit path of said first transistor, and said second Zener diode is oriented to normally prevent forward biasing current flow in the control circuit of said second transistor, whereby both of said transistors are maintained normally nonconducting.
Claim 4
Dependent Claim
37 words
The discriminator of claim 2 wherein: the Zener voltage of said first Zener diode is sufficient to prevent current flow in said first transistor until voltage across said input conductors rises to a first predetermined minimum level.
Claim 5
Dependent Claim
69 words
The discriminator of claim 3 wherein: the Zener voltage of said second Zener diode is sufficient to prevent current flow in said second transistor until voltage across said input conductors rises to a second predetermined minimum level above said first level, said levels being established at lower and upper limits of a range of input voltage for which an output is to be produced across said third impedance means.
Claim 6
Dependent Claim
49 words
The discriminator of claim 4 wherein: said first impedance means is in series circuit relationship with the load circuit path of said second transistor, said first impedance means being of a value sufficient to cause back biasing and shutoff of said first transistor upon conduction of said second transistor.
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 |