Boots – shoes – and leggings
Patent
1984-08-08
1986-10-14
Wise, Edward J.
Boots, shoes, and leggings
364424, 377 20, 340 52D, G06F 1520, G08B 1900, B60Q 100
Patent
active
046176390
ABSTRACT:
Electronic hourmeter devices having non-volatile memories are useful, for example, in industrial vehicles. Advantageously, such non-volatile memories should be free from a need for battery back-up systems and should minimize the number of changes of the internal memory registers. The subject electronic hourmeter apparatus includes both a dynamic memory device and a non-volatile memory device. Data is maintained in each of the memory devices and memory bit changes are minimized by utilizing a gray coded binary representation of a portion of the data and by systematically altering the addressed memory location of a portion of the data in response to one of the stored data values. Data storage occurs both periodically and in response to disconnection of the vehicle battery. Thus, the disclosed electronic hourmeter apparatus 10 advantageously maintains the integrity of the stored data, minimizes the number of bit changes that occur in the non-volatile memory device, and avoids the need for a battery back-up.
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Caterpillar Industrial Inc.
Noe Stephen L.
Wise Edward J.
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