Liquid purification or separation – Filter – With pump – gas pressure – or suction source
Patent
1991-07-19
1993-11-30
Dawson, Robert A.
Liquid purification or separation
Filter
With pump, gas pressure, or suction source
210464, 210470, B01D 2708, B01D 3526
Patent
active
052661962
ABSTRACT:
A water filter including an inlet assembly which comprises a prefiltering foam tip. The inlet hose includes an adjustable float and a weight on the end of the hose which allows a given length at the end of the inlet hose to extend below the surface of the water being filtered. The water filter further includes a check valve assembly to relieve pressure buildup inside the pump. A unique lever-action handle, in combination with a rocking piston, allows efficient filtering with few moving parts. The filter components are easily replaceable. The main filter assembly is suspended resiliently at its periphery to provide shock-absorbing characteristics. The filter also includes an adaptor base which allows for a direct connect between the vessel into which water is filter. The water filter also provides a unique method of storing the inlet hose to render the water filter easy to carry and prevent foreign objects and debris from entering into the area of working parts.
REFERENCES:
patent: 703654 (1902-07-01), Hall
patent: 4054526 (1977-10-01), Muller
patent: 4828698 (1989-05-01), Jewell et al.
patent: 5019252 (1991-05-01), Kanei et al.
patent: 5051173 (1991-09-01), Hoelzl
patent: 5130015 (1992-07-01), Simizu et al.
Advertisement in Jun. 1991 issue of The Mountaineer for "Lightweight Champion" by Mitsubishi.
Brochure for "PUR Explorer", mfg'd by Recovery Eng'rg., Inc. of Minneapolis, Minn. (1991).
Brochure for "OUTBACK filter bottle", mfg'd by Hiker Supply of Bremerton, Wash. (date unknown).
Advertisement in Dec. 1990 issue of Outdoor Retailer for "Ceramic Water Filter", mfg'd by Basic Designs, Inc. of Santa Rosa, Calif.
Instruction sheet for "Timberline filter" mfg'd by Timberline of Boulder, Colorado (date unknown).
Brochure for "Katadyn Pocket Filter", mfg'd by Katadyn U.S.A. Inc. of Scottsdale, Ariz. (date unknown).
Brochure for "first need" portable water purification device, mfg'd by General Ecology Inc. of Lionville, Pa., (1988).
Brochure for "Model PWP" of Pre-Mac (Kent) Ltd. of Kent, England (date unknown).
Brochure for "RELAGS Wasser-Filter System" (date unknown).
Brochure for "The Survivor 06" of Recovery Engineering of Minneapolis, Minn. (date unknown).
Dienes Nancy L.
Fife James F.
Laughlen Kenneth D.
Vorhis Daniel J.
Dawson Robert A.
Millard W. L.
Mountain Safety Research, Inc.
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