Liquid purification or separation – Particulate material type separator – e.g. – ion exchange or... – With rehabilitation means
Reexamination Certificate
2005-08-02
2005-08-02
Kim, John (Department: 1723)
Liquid purification or separation
Particulate material type separator, e.g., ion exchange or...
With rehabilitation means
C055S307000, C055S482000
Reexamination Certificate
active
06923911
ABSTRACT:
The filter system for filtering particulate material from a generally unidirectional fluid stream comprising a first filter removably positioned in the fluid stream and a second filter removably positioned in the fluid stream downstream of the first filter. The first filter comprises a pre-filter and includes a layer of fluid-permeable material having a plurality of spaced-apart openings extending completely therethrough. The method of utilizing the fluid filter system of this invention is also disclosed and comprises the steps of: (1) removably positioning a first filter in the fluid stream; and (2) removably positioning a fluid-permeable second filter in the fluid stream downstream of the first filter. The first filter may be removed from the fluid when it becomes restrictive to air flow. The system may be operated so that the air may be passed through the second filter until the second filter becomes clogged or restrictive to air flow. The filters may be positioned in an air discharge passageway associated with a paint spray booth or may be positioned in an air intake passageway extending into a heating system, a ventilating system or an air conditioning system.
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Adams Rex A.
Beier Scott B.
Kim John
Thomte Dennis L.
Thomte Mazour & Niebergall
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