Telegraphy – Systems – Printing
Patent
1974-10-15
1976-04-06
Claffy, Kathleen H.
Telegraphy
Systems
Printing
178DIG10, 17910041B, 307 88ET, 29592, 427 35, H04R 1900, H01G 702
Patent
active
039491781
ABSTRACT:
An electret device has a dielectric layer containing electret charges and a radioactive layer on one of the surfaces of the dielectric layer.
REFERENCES:
patent: 3095476 (1963-06-01), Crownover
patent: 3123511 (1964-03-01), Coleman
patent: 3448348 (1969-06-01), Stadler
patent: 3644605 (1972-02-01), Sessler et al.
Hellstrom Sten
Jonsson Rolf Bertil Goran
Claffy Kathleen H.
Stellar George G.
Telefonaktiebolaget L M Ericsson
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