Loudspeaker with burning resistant diaphragm

Details Loudspeaker with burning resistant diaphragm Loudspeaker with burning resistant diaphragm

1976-11-05

1978-04-25

Brown, Thomas W.

Paper making and fiber liberation

Apparatus

Digester

162159, 181167, 252 81, 260 2EN, H04R 700, G10K 1300, C09K 328

Patent

active

040864499

ABSTRACT:
The invention discloses a loudspeaker with a diaphragm made of pulp fibers treated with a chemical condensation product of an ammonium salt of a polyphosphoric acid having a high degree of condensation with polyethyleneimine. The diaphragm has burning resistance, and the deterioration of acoustic characteristics may be prevented.

REFERENCES:
patent: 1759387 (1930-05-01), Bateholts
patent: 3565679 (1971-02-01), Strother, Jr.
patent: 3723074 (1973-03-01), Sears et al.
patent: 3907063 (1975-09-01), Nakazawa et al.
patent: 3989531 (1976-11-01), Orlando et al.

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