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US 5,437,701 AGranted
Air filter and method of construction
AssigneeS.T. Technologies, Inc.
InventorDavid M. Townsley
Life of this patent
Estimating the term…
Abstract
The invention relates to a method of treating reticulated foam with a controlled migration treatment medium to produce an improved air filter. Reticulated foam is treated with a highly viscous oil that protects the foam from hydrolytic degradation and increases efficiency of the filter without causing unacceptable air restriction of the foam. An improved air filter made from treated and untreated layers of reticulated foam is also shown.
Claims5
An improved air filter for filtering a dirty incoming stream of air entering a vehicle engine, comprising:
- an outer layer facing the incoming stream of dirty air;
- a plurality of inner treated layers of foam, each of the treated inner layers being coated with a controlled migration treatment medium having a Saybolt Universal viscosity in the range from about 8,500 to 36,000 SUS;
- and
- wherein the inner treated layers of foam are further characterized as having a residual amount of controlled migration treatment medium, after removal of solvent, if solvent is present, in the range from about 0.25 to about 2.0 grams of treatment medium per cubic inch of untreated foam filter material.
1 more element
Dependencies are inferred from the claim text.