Battery operated device with a battery life indicator

Details Battery operated device with a battery life indicator Battery operated device with a battery life indicator

2007-11-13

2007-11-13

Swarthout, Brent A. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S636190, C340S007320, C320S132000, C320S133000

Reexamination Certificate

active

11401755

ABSTRACT:
A countdown timer for high performance flashlights and similar battery-operated devices that is initialized with a runtime figure equal to the life expectancy of installed linear depletion-curve cells, that is always on and visible, that counts down whenever the flashlight is switched to the ON position, and that displays time remaining until the installed cells/charge are depleted, thus permitting the user to see at a glance the approximate runtime remaining on the installed power supply.

REFERENCES:
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patent: 5216371 (1993-06-01), Nagai
patent: 6064183 (2000-05-01), Akizuki et al.
patent: 6405062 (2002-06-01), Izaki
patent: 6870349 (2005-03-01), Cook
patent: 6995543 (2006-02-01), Nunomaki et al.
patent: 7110896 (2006-09-01), Lamer et al.
patent: 7123155 (2006-10-01), Schinner

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