Clogged filter indicator
United States Patent 3027865
US Patent References:
Pressure gauge
- - 2505118

Air conditioner filter indicator
- - 2700362

Suction indicator for vacuum cleaner
- - 2815733

Filter gauge
- - 2921157


Inventors:
Kautz, Murrell F.
Olson, Elwyn H.
Publication Date:
04/03/1962
View Patent Images:
Download PDF 3027865 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
HONEYWELL REGULATOR CO
Primary Class:
116/268
Other Classes:
116/DIG.042, 55/DIG.034, 96/421
International Classes:
B01D46/42; F02M35/09; F24F13/28; F02M35/02; F24F13/00