Boots – shoes – and leggings
Patent
1989-01-12
1991-03-12
Williams, Jr., Archie E.
Boots, shoes, and leggings
3642217, 3642372, 3642375, 3642397, 3642655, 364267, 3642682, 3642701, 3642324, 371 60, 371 62, 340524, G06F 1128, G06F 1132, G08B 538
Patent
active
049997670
ABSTRACT:
An electronic digital computer has a warning facility for indicating activity and operation, or lack of same, of the central processor in the system. It is done by providing a signal indicative of continuing operation of the central processor to activate an indicator circuit. The indicated circuit utilizes an RC circuit for maintaining a high level through a high comparator when the processor is operational. When the central processor becomes non-operational, the capacitor discharges to a point where a low comparator responds, causing the capacitor to begin charging to its high value. The associated circuits, using this feature, maintain an LED in the active stage until such time as there is no signal indicating continuing operation of the central processor, at which time the LED begins an approximate 50% duty cycle resulting in a blinking indicator.
REFERENCES:
patent: 4322847 (1982-03-01), Dodge et al.
patent: 4611271 (1986-09-01), Hattori et al.
patent: 4689766 (1987-08-01), Kent
patent: 4739309 (1988-04-01), Brauninger et al.
Chan Emily Y.
Dell Corporate Services Corporation
Devine Thomas G.
Williams Jr. Archie E.
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