Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1980-07-25
1982-09-28
Grimley, A. T.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
179111R, 181150, H04R 1900
Patent
active
043520391
ABSTRACT:
A sonic transducer device for vibrating windows and glass partitions in the uman ear sensitivity range to prevent the capture of conversation by placing an interfering vibration on the windows or glass partitions.
REFERENCES:
patent: 2341275 (1944-02-01), Holland
patent: 2796467 (1957-06-01), Kock
patent: 3311712 (1967-03-01), Cain
patent: 4048454 (1977-09-01), Barcus et al.
patent: 4098370 (1978-07-01), McGregor et al.
Hagood Jerry W.
Norman Ralph L.
Deaton James T.
Edelberg Nathan
Gibson Robert P.
Grimley A. T.
Rebsch D. L.
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