Gas separation: processes – With timing of operation
Reexamination Certificate
2006-05-30
2009-11-24
Smith, Duane (Department: 1797)
Gas separation: processes
With timing of operation
C055SDIG034, C096S419000, C096S421000, C096S424000, C116S070000, C116S112000, C116S276000, C116S13700R, C116SDIG042, C210S090000, C210S138000
Reexamination Certificate
active
07621978
ABSTRACT:
A timer that starts a time cycle when a filter is placed into a housing is disclosed. The timer cycle will not reinitiate a new time cycle when the previously used filter is removed from the housing and reinserted into the housing. In one embodiment, the filter timer assembly includes a filter having a filter media surrounded by a filter frame, a housing for supporting the filter, a piercing post connected to the housing moveable between a first resting position and a second position in direct contact with the filter frame, and a timer connected to the piercing post. The piercing post punctures a portion of the filter frame to create an opening in the filter frame. The timer initiates a count when the piercing post is actuated to the second position.
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3M Innovative Properties Company
Adamson Trisha D.
Pham Minh-Chau T
Smith Duane
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