Boots – shoes – and leggings
Patent
1995-06-06
1996-12-17
Ramirez, Ellis B.
Boots, shoes, and leggings
G01R 2726
Patent
active
055860427
ABSTRACT:
A new and improved method for measuring the value of a capacitor and for detecting small variations in the value of a capacitor around a reference value is described. In accordance with the invention, the capacitance of capacitor may be determined by applying a voltage input having a known amplitude and wave form V to an RC circuit having a substantially known or constant load impedance R and sampling the voltage across the resistor or capacitor at a precisely controlled elapsed time interval T. The method now permits improved detector circuits to be created for measuring small variations in value with precision and accuracy. Solid state keypads incorporating sensor cells and software algorithms provide superior human to machine interface systems which are not subject to environmentally induced errors or errors due to component aging.
REFERENCES:
patent: 4088904 (1978-05-01), Green
patent: 4258326 (1981-03-01), Johne
patent: 4668314 (1987-05-01), Endoh et al.
patent: 5063306 (1991-11-01), Edwards
patent: 5469364 (1995-11-01), Hughey et al.
Van Nostrand; Dictionary of Physics and Electronics; Van Nostrand (New York) 1956.
Millea Liviu
Pisau Lucretiu
Hughey-Pisau, Ltd.
Ramirez Ellis B.
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