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US 4,687,579 AGranted
Sintered composite medium and filter
AssigneeThe United States of America as represented by the United States Department of Energy
InventorWerner Bergman
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AssigneeThe United States of America as represented by the United States Department of Energy
InventorWerner Bergman
Estimating the term…
A particulate filter medium is formed of a sintered composite of 0.5 micron diameter quartz fibers and 2 micron diameter stainless steel fibers. A preferred composition is about 40 vol. % quartz and about 60 vol. % stainless steel fibers. The media is sintered at about 1100.degree. C. to bond the stainless steel fibers into a cage network which holds the quartz fibers. High filter efficiency and low flow resistance are provided by the smaller quartz fibers. High strength is provided by the stainless steel fibers. The resulting media has a high efficiency and low pressure drop similar to the standard HEPA media, with tensile strength at least four times greater, and a maximum operating temperature of about 550.degree. C. The invention also includes methods to form the composite media and a HEPA filter utilizing the composite media. The filter media can be used to filter particles in both liquids and gases.
A filter media comprising a sintered composite of quartz fibers and stainless steel fibers having a filter efficiency of at least about 99.99% for 0.3 micron diameter particles, an operative temperature up to about 550.degree. C., and flow resistance comparable to and tensile strength at least four times that of a standard high efficiency particulate air filter media.
A high temperature high efficiency particulate filter, for gas or liquid filtration, operating at temperatures up to about 550.degree. C., and having a filter efficiency of at least about 99.99% for 0.3 micron diameter particles, comprising:
A high temperature high efficiency particulate filter, for gas or liquid filtration, operating at temperatures up to about 550.degree. C., and having a filter efficency of at least about 99.99% for 0.3 micron diameter particles, comprising:
A high temperature high efficiency particulate filter, for gas or liquid filtration, operating at temperatures up to about 550.degree. C., and having a filter efficiency of at least about 99.99% for 0.3 micron diameter particles, comprising:
A high temperature high efficiency particulate filter, for gas or liquid filtration, operating at temperatures up to about 550.degree. C. and having a filter efficiency of at least about 99.99% for 0.3 micron diameter particles, comprising:
A high temperature high efficiency particulate filter, for gas or liquid filtration, operating at temperatures up to about 550.degree. C., and having a filter efficiency of at least about 99.99% for 0.3 micron diameter particles, comprising:
Dependencies are inferred from the claim text.