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VACUUM CLEANER FILTER CONDITION SENSING SYSTEM
US 3,505,791 A
Filed
: 07/01/1968
Issued
: 04/14/1970
Est. Priority Date
: 07/01/1968
Status: Expired due to Term
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Current Assignee
John J. Breslin
Original Assignee
John J. Breslin
Inventors
Breslin, John J.
Application Number
US04/741,789
Time in Patent Office
652 Days
Field of Search
US Class Current
96/421
CPC Class Codes
A47L 5/38
Built-in suction cleaner in...
A47L 9/19
Means for monitoring filter...
Y10S 55/08
Built-in vacuum cleaners
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