Liquid purification or separation – Plural distinct separators – Filters
Patent
1987-06-25
1991-10-15
Dawson, Robert A.
Liquid purification or separation
Plural distinct separators
Filters
210486, 2104941, B01D 2939, B01D 2933
Patent
active
050572172
ABSTRACT:
An integral filter leaf assembly comprising microporous polymeric filter cloths heat-bonded to the apices of an undulating screen to form a strong unitary pressure resistant filter unit which essentially replaces filter leaf assemblies. The screen and felt sides of the filter cloths are preferably heat sealable thermoplastics, usually polypropylene to allow heat-bonding and heat-sealing of seams throughout for a unitary assembly strong in compression. Outer filter coat is preferably porous expanded polytetrafluoroethylene. Optionally, a circumferential stiff load-bearing frame may be enclosed within the assembly.
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patent: 3737036 (1973-06-01), Kasten
patent: 4045350 (1977-08-01), Kupf et al.
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patent: 4256586 (1981-03-01), Roos et al.
patent: 4637876 (1987-01-01), Dausoudil
Lutz John H.
Manniso James L.
Rinschler Craig R.
Smith Gordon R. S.
Dawson Robert A.
Millard Wanda L.
W. L. Gore & Associates, Inc.
Weker Dena M.
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