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Residual life indicator

Patent image
AECBC

A residual life indicator for determining the residual life of a filter has a first sample filter with an inlet coupleable to an inlet of the filter whose residual life is to be determined, a second sample filter having an inlet coupleable to an outlet of the filter whose residual life is to be determined, a chemical tracer source selectively coupled to the inlets of the first and second sample filters, and a detector selectively coupled to outlets of the first and second filters.

Inventors: 
Peterson, Gregory W.; Karwacki, Christopher J.; Friday, David; Shrewsbury, Marc
Patent Number: 
Technical domain: 
Environmental Technology
FIle Date: 
2008-03-06
Grant Date: 
2012-06-26
Grant time: 
1,573 days
Grant time percentile rank: 
28
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
UNITED STATES OF AMERICA