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Air filter alarm systems and air filter alarm units
US 2,804,839 A
Filed
: 12/14/1954
Issued
: 09/03/1957
Est. Priority Date
: 12/14/1954
Status: Expired due to Term
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Current Assignee
William W. Hallinan
Original Assignee
William W. Hallinan
Inventors
Hallinan, William W.
Application Number
US03/475,208
Time in Patent Office
994 Days
Field of Search
US Class Current
116/112
CPC Class Codes
B01D 2279/50
for air conditioning air-co...
B01D 46/0086
Filter condition indicators
B01D 46/10
Particle separators, e.g. d...
B01D 46/58
connected in parallel
F24F 13/28
Arrangement or mounting of ...
Y10S 116/42
Oil filter
Y10S 55/34
Indicator and controllers
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