Gas separation: apparatus – With signals – indicators – measuring – or testing means – Sound signal
Reexamination Certificate
2005-01-04
2005-01-04
Pham, Minh-Chau T. (Department: 1724)
Gas separation: apparatus
With signals, indicators, measuring, or testing means
Sound signal
C096S421000, C055SDIG003, C116S070000, C116S112000, C116S276000, C116S13700R, C116SDIG004, C210S090000
Reexamination Certificate
active
06837922
ABSTRACT:
An air filter sensor kit and method of using the same for permitting a person to modify the filtering portion of a heating or cooling system that uses an air filter to enable the determination of when the air filter is dirty and needs changing. The air filter sensor kit includes an air filter sensor with a portion shaped for insertion through the air filter and a portion with an indicator for indicating the condition of the air filter. The kit includes an air filter sensor connecting and support member for connecting the air filter sensor to an air filter grill and for supporting the air filter sensor and a cutting tool for cutting a hole in an air filter grill to allow the passage of a portion of the air filter sensor connecting and support member to permit a portion of the air filter sensor to be inserted through the air filter. The air filter sensor kit also includes a cutting tool guide that is adjustable to conform to various configurations of air filter grills.
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patent: 2804839 (1957-09-01), Hallinan
patent: 3934238 (1976-01-01), Pavlou
patent: 4321070 (1982-03-01), Bede
patent: 5057821 (1991-10-01), Card
patent: 5718822 (1998-02-01), Richter
patent: 5917141 (1999-06-01), Naquin, Jr.
patent: 6096224 (2000-08-01), Champie
Pham Minh-Chau T.
York Michael W.
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