Electrical generator or motor structure – Educational or construction units or kits
Patent
1974-12-30
1976-11-30
Budd, Mark O.
Electrical generator or motor structure
Educational or construction units or kits
73 675R, 310 91, 340 8FT, 340 10, H01L 4108
Patent
active
039951790
ABSTRACT:
An ultrasonic transducer that employs a piezoelectric crystal which is made of lead metaniobate so that it has good sensitivity while also having a low Q. The transducer includes a backing support for one face of the crystal which provides damping of the acoustic energy being generated in the reverse direction. The backing support includes an epoxy resin with heavy metal objects moulded therein.
REFERENCES:
patent: 2728869 (1955-12-01), Pohlman
patent: 2803129 (1957-08-01), Bradfield
patent: 2881336 (1959-04-01), Elion
patent: 2972068 (1961-02-01), Howry et al.
patent: 2984756 (1961-05-01), Bradfield
patent: 3403271 (1968-09-01), Lobdell et al.
patent: 3794866 (1974-02-01), McElroy
Flournoy Norman E.
Morris David A.
Budd Mark O.
Dearborn Henry C.
Ries Carl G.
Texaco Inc.
Whaley Thomas H.
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