US4398098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic latching circuit
Assignee: NCR Voyix Corp
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Filing: 1982-04-26
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Granted: 1983-08-09
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Expires: 2002-04-26
Abstract
Abstract An electronic latching circuit is described for incorporation into an electronic equipment which includes a battery, a load and a power supply. During shipment or storage of the equipment, the electronic latching circuit electrically isolates the battery from the load. The first time that the equipment is put into operation and turned on after shipment or storage, the electronic latching circuit automatically permanently connects the battery to the load. Once connected to the load the battery remains connected to the load, even when the equipment has a power failure, the power supply fails or the equipment is turned off. In a preferred embodiment the electronic latching circuit comprises: switching means for electrically isolating the battery from the load when the switching means is disabled and for connecting the battery to the load when the switching means is enabled; and input means connected to the battery and to the switching means for disabling the switching means until the power supply is initially energized and being responsive to the initial energization of the power supply for permanently enabling the switching means to connect the battery to the load.
Inventors
- 👤 Jerry M. Minchey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:48
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/22; H03K17/30; H03K2017/226
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
In an electronic equipment which includes a battery, a load and a power supply, an electronic latching circuit comprising: switching means for electrically isolating the battery from the load when said switching means is disabled and for connecting the battery to the load when said switching means is enabled; and input means connected to the battery and to said switching means for disabling said switching means until the power supply is initially energized and being responsive to the initial energization of the power supply for automatically permanently enabling said switching means to connect the battery to the load.
Claim 2
Dependent Claim
98 words
In an electronic equipment which includes a battery, a load and a power supply, an electronic latching circuit comprising: switching means for electrically isolating the battery from the load when said switching means is disabled and for connecting the battery to the load when said switching means is enabled; and input means connected to the battery and to said switching means for disabling said switching means until the power supply is initially energized and being responsive to the initial energization of the power supply for automatically permanently enabling said switching means to connect the battery to the load.
Claim 3
Dependent Claim
117 words
In an electronic equipment which includes a battery, a load and a power supply, an electronic latching circuit comprising: switching means connected between the battery and the load and being responsive to a first voltage level for electrically isolating the battery from the load and being responsive to a second voltage level for connecting the battery to the load; and input means connected to the battery and to said switching means for developing the first voltage level until the power supply is initially energized, said input means being responsive to the initial energization of the power supply for developing the second voltage level to automatically permanently enable said switching means to couple the battery to the load.
Claim 4
Dependent Claim
117 words
In an electronic equipment which includes a battery, a load and a power supply, an electronic latching circuit comprising: switching means connected between the battery and the load and being responsive to a first voltage level for electrically isolating the battery from the load and being responsive to a second voltage level for connecting the battery to the load; and input means connected to the battery and to said switching means for developing the first voltage level until the power supply is initially energized, said input means being responsive to the initial energization of the power supply for developing the second voltage level to automatically permanently enable said switching means to couple the battery to the load.
Claim 5
Dependent Claim
36 words
The electronic latching circuit of claim 2 wherein said switching means includes: an amplifying device having an input circuit connected to said input means and an output circuit serially connected between the battery and the load.
Claim 6
Dependent Claim
115 words
The electronic latching circuit of claim 3 wherein said input means includes: a first resistor; and a fuse serially-connected to said first resistor at a common junction to which the power supply and said input circuit are also coupled, said serially-connected first resistor and fuse being connected across the battery to enable the first voltage level to be developed at the common junction until the power supply is initially energized, said fuse being blown by current flow therethrough from the power supply when the power supply is initially energized to thereby cause the common junction to rise to the second voltage level to permanently enable said switching means to connect the battery to the load.
Claim 7
Dependent Claim
76 words
The electronic latching circuit of claim 2 wherein said switching means includes: first and second transistor circuits each having an input circuit and an output circuit, said input circuit of said first transistor circuit being connected to said input means, said output circuit of said first transistor circuit being connected to said input circuit of said second transistor circuit, said output circuit of said second transistor circuit being serially connected between the battery and the load.
Claim 8
Dependent Claim
120 words
The electronic latching circuit of claim 5 wherein said input means includes: a first resistor; and a fuse serially-connected to said first resistor at a common junction to which the power supply and said input circuit of said first transistor circuit are also coupled, said serially-connected first resistor and fuse being connected across the battery to enable the first voltage level to be developed at the common junction until the power supply is initially energized, said fuse being blown by current flow therethrough from the power supply when the power supply is initially energized to thereby cause the common junction to rise to the second voltage level to permanently enable said switching means to couple the battery to the load.
Claim 9
Dependent Claim
55 words
The electronic latching circuit of claim 4 or 6 wherein said input means further includes a second resistor connected between the power supply and the common junction to limit the current through said fuse and to prevent the power supply from latching off during the initial energization of the power supply due to excess current.
Claim 10
Dependent Claim
196 words
In an electronic equipment which includes a battery, a load and a power supply, an electronic latching circuit comprising: a switching circuit having an output circuit connected between the battery and the load and an input circuit, said switching circuit being responsive to a first voltage level applied to said input circuit for electrically isolating the battery from the load and to a second voltage level applied to said input circuit for connecting the battery to the load; a common junction to which said input circuit is connected; first and second resistors, said first resistor being connected between the power supply and said common junction; a fuse serially-connected to said second resistor at said common junction, said serially-connected second resistor and fuse being connected across the battery to develop the first voltage level at said common junction until the power supply is initially energized, said fuse being blown by current flow therethrough from the power supply by way of said first resistor when the power supply is initially energized to thereby cause said common junction to rise to the second voltage level to automatically permanently enable said switching means to connect the battery to the load.
Claim 11
Dependent Claim
196 words
In an electronic equipment which includes a battery, a load and a power supply, an electronic latching circuit comprising: a switching circuit having an output circuit connected between the battery and the load and an input circuit, said switching circuit being responsive to a first voltage level applied to said input circuit for electrically isolating the battery from the load and to a second voltage level applied to said input circuit for connecting the battery to the load; a common junction to which said input circuit is connected; first and second resistors, said first resistor being connected between the power supply and said common junction; a fuse serially-connected to said second resistor at said common junction, said serially-connected second resistor and fuse being connected across the battery to develop the first voltage level at said common junction until the power supply is initially energized, said fuse being blown by current flow therethrough from the power supply by way of said first resistor when the power supply is initially energized to thereby cause said common junction to rise to the second voltage level to automatically permanently enable said switching means to connect the battery to the load.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |