Filter and blower unit for breathing masks or bonnets

Details Filter and blower unit for breathing masks or bonnets Filter and blower unit for breathing masks or bonnets

2003-12-19

2009-02-03

Douglas, Steven O (Department: 3771)

Surgery

Respiratory method or device

Means for removing substance from respiratory gas

C128S205270

Reexamination Certificate

active

07484509

ABSTRACT:
A direct current motor having a fixed stator coil module and a magnetic rotor that can be rotated around the perimeter of said module and forming an impeller at the same time. The coils, terminal and electric connecting lines as well as upstream motor control and voltage converter modules are embedded in a non-conductive casting compound. Power is supplied from an intrinsically safe accumulator or battery pack at a voltage that is still considered intrinsically safer using a higher current value to match the required motor output. The filter and blower unit can be used in zone “0” potentially explosive atmospheres.

REFERENCES:
patent: 4320755 (1982-03-01), Flint et al.
patent: 4633868 (1987-01-01), Itoh et al.
patent: 5072728 (1991-12-01), Pasternack
patent: 5973424 (1999-10-01), Engelberger et al.
patent: 6032668 (2000-03-01), Chung
patent: 197 46 605 (1998-06-01), None
patent: 2 338 655 (1999-12-01), None

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