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US Patent: 6,252,378
Usage Counter for Portable Jump-Starting Battery Unit
Patentees:
Matthew M. Crass (exact or similar names) - Pleasant Prairie, WI
Thomas P. Becker (exact or similar names) - Kenosha, WI

USPTO Classifications:
320/132

Tool Categories:

Assignees:
Snap-On Technologies, Inc. - Lincolnshire, IL

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Jun. 19, 2000
Granted: Jun. 26, 2001

Patent Pictures:
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Snap-On Tools Company History
Description:
Seyfarth & Shaw - patent attorneys

This application claims the benefit of the filing date of copending U.S. provisional application No. 60/175,363, filed Jan. 10, 2000.

Abstract

A usage counter has input terminals connectable to the terminals of a jump-starting battery pack. The counter has an IC comparator which generates an output signal when battery voltage drops below a predetermined reference level. If the output signal persists for a predetermined time period, indicating an attempt to jump-start an engine with the battery pack, an IC timer is triggered to output a count pulse which is inverted and then counted and displayed by an IC counter/display circuit. The usage counter circuit is powered by the battery pack and has a Zener diode which provides to the IC circuits a limited supply voltage which is unaffected by voltage spikes which might appear at the battery pack terminals. A capacitor maintains the reference voltage level despite momentary drops in battery terminal voltage.

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