Dielectric cellular electret film and procedure for its...

Details Dielectric cellular electret film and procedure for its... Dielectric cellular electret film and procedure for its...

2005-02-08

2005-02-08

Morris, Terrel (Department: 1771)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

C428S314400, C428S317100, C428S317300, C428S343000, C307S400000, C084S733000, C084S723000

Reexamination Certificate

active

06852402

ABSTRACT:
Film of dielectric material, which film contains gas bubbles preferably of a flat shape. To achieve improved electrical properties, the film is given a large internal unipolar charge, which is created by charging the film by means of an electric field intensive enough to produce partial discharges in the gas bubbles and to cause the charges to move into the dielectric material of the film.

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patent: 4741119 (1988-05-01), Baryla
patent: 5010671 (1991-04-01), Stonehouse
patent: 5051586 (1991-09-01), Sabreen
patent: 5178942 (1993-01-01), Frognet et al.
patent: 5258214 (1993-11-01), Cooledge et al.
patent: 29 47 873 (1980-07-01), None
patent: 9408779 (1994-04-01), None

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