US3599049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-polarity electronic switch
Assignee: Syndyne Corp
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Filing: 1969-04-30
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Granted: 1971-08-10
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Expires: 1989-04-30
Abstract
Abstract An electronic switch responding to the closure of the contacts of a meter relay operated by a grounded junction thermocouple, the switch containing a switching amplifier so that the device is actuated by a flow of current through the meter relay contacts which is too small to cause a noticeable change in the meter reading, and containing a dual-polarity gate arranged so that the switch is operable if the thermocouple junction is grounded to the positive or to the negative side of the battery power source.
Inventors
- 👤 Robert A Barnard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:53
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
372 words
An electronic switching device, in association with a direct current power source having two terminals, comprising: a gate having two input terminals, two output terminals, a first state characterized by the existence of a high internal electrical resistance between said two output terminals, and a second state characterized by the existence of a low internal electrical resistance between said two output terminals, said gate being in said first state when there is no external current flow between said two input terminals, said gate being in said second state when one of said input terminals is connected to one of said power source terminals and the other of said input terminals is also connected to one of said power source terminals, and a switching amplifier having two amplifier input terminals, two amplifier output terminals, a first amplifier state characterized by a high internal resistance to current flow between said amplifier output terminals, and a second amplifier state characterized by a low internal resistance to current flow between said amplifier output terminals, said switching amplifier being in one of said amplifier states when there is no external current flow between said amplifier input terminals, said switching amplifier being in the other of said two amplifier states when there is a low external resistance to current flow between said two amplifier input terminals, one of said gate output terminals being connected to one of said amplifier input terminals, and the other of said gate output terminals being connected to the other of said amplifier input terminals, and the steady-state current flow through said gate input terminals being less than 200 microamperes when said gate is in said second state, said gate comprising in part a diode having two terminals, one of said diode terminals being connected to one of said gate input terminals, a resistor having two terminals, one of said resistor terminals being connected to said one of said gate input terminals, and a transistor having a base terminal, an emitter terminal, and a collector terminal, the other of said resistor terminals being connected to said base terminal, the other of said diode terminals being connected to said collector terminal, and the other of said gate input terminals being connected to said emitter terminal.
Claim 2
Dependent Claim
372 words
An electronic switching device, in association with a direct current power source having two terminals, comprising: a gate having two input terminals, two output terminals, a first state characterized by the existence of a high internal electrical resistance between said two output terminals, and a second state characterized by the existence of a low internal electrical resistance between said two output terminals, said gate being in said first state when there is no external current flow between said two input terminals, said gate being in said second state when one of said input terminals is connected to one of said power source terminals and the other of said input terminals is also connected to one of said power source terminals, and a switching amplifier having two amplifier input terminals, two amplifier output terminals, a first amplifier state characterized by a high internal resistance to current flow between said amplifier output terminals, and a second amplifier state characterized by a low internal resistance to current flow between said amplifier output terminals, said switching amplifier being in one of said amplifier states when there is no external current flow between said amplifier input terminals, said switching amplifier being in the other of said two amplifier states when there is a low external resistance to current flow between said two amplifier input terminals, one of said gate output terminals being connected to one of said amplifier input terminals, and the other of said gate output terminals being connected to the other of said amplifier input terminals, and the steady-state current flow through said gate input terminals being less than 200 microamperes when said gate is in said second state, said gate comprising in part a diode having two terminals, one of said diode terminals being connected to one of said gate input terminals, a resistor having two terminals, one of said resistor terminals being connected to said one of said gate input terminals, and a transistor having a base terminal, an emitter terminal, and a collector terminal, the other of said resistor terminals being connected to said base terminal, the other of said diode terminals being connected to said collector terminal, and the other of said gate input terminals being connected to said emitter terminal.
References Cited (Backward Citations)
US3131314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |