US4992340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intrinsic safe battery having self test capability
Assignee: Motorola Solutions Inc
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Filing: 1989-04-20
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Granted: 1991-02-12
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Expires: 2009-04-20
Abstract
Abstract A battery having a self testing feature for its intrinsic safety circuitry is provided. The battery uses light emitting diodes to indicate the operation of safety circuit in the battery. The safety circuitry of the battery may be tested by providing a short across the battery terminals, if the associated circuitry is operational the light emitting diode will light. This feature will also indicate, when the load across the battery is shorted.
Inventors
- 👤 James L. Tidwell
- 👤 Henry A. Bogut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:52
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/80
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
A battery having a first and second contact, comprising: at least one battery cell having first and second terminals, means for switching coupled between said first terminal and said first contact, means for controlling said switch coupled to said battery cell and switching means, responsive to detection of a momentary short between first and second contacts, to open said switching means, and provide a constant current through said battery cell; means for indicating when a short is present between said first and second contacts.
Claim 2
Dependent Claim
84 words
A battery having a first and second contact, comprising: at least one battery cell having first and second terminals, means for switching coupled between said first terminal and said first contact, means for controlling said switch coupled to said battery cell and switching means, responsive to detection of a momentary short between first and second contacts, to open said switching means, and provide a constant current through said battery cell; means for indicating when a short is present between said first and second contacts.
Claim 3
Dependent Claim
15 words
The battery of claim 1, wherein said indicating means is coupled across said switching means.
Claim 4
Dependent Claim
15 words
The battery of claim 1, wherein said indicating means is coupled to said controlling means.
Claim 5
Dependent Claim
11 words
The battery of claim 1, wherein said switching means comprise transistors.
Claim 6
Dependent Claim
13 words
The battery of claim 1, wherein said controlling means comprise silicon controlled rectifiers.
Claim 7
Dependent Claim
13 words
The battery of claim 1, wherein said indicating means comprise light emitting diodes.
Claim 8
Dependent Claim
15 words
The battery of claim 1, wherein said battery is used on a two-way portable radio.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |