Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2000-04-13
2001-10-23
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
Reexamination Certificate
active
06307304
ABSTRACT:
TECHNICAL FIELD
This invention relates in general to electrical devices, and more particularly to a piezoelectric active-mode incrementor switch system.
BACKGROUND
Electronic devices such as instruments, stereos, portable two-way radios, etc. are usually equipped with a variety of rotary switches to control device operation. Presently, most of these switches are of the electro-mechanical type. Unfortunately, electromechanical switches have limited reliability due to the wear of the switch contacts or contamination of the contacts. Some electro-mechanical switches are also complex and expensive to manufacture. A need thus exists for a switch system that can minimize some of the problems previously mentioned.
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Guzik Andrzej T.
Mullen, III William Boone
Ross Danny E.
Vivian, Jr. Raymond C.
Yorio Rudy
Dougherty Thomas M.
Dulaney Randi L.
Motorola Inc.
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