Electropure granted second U.S. patent for ion exchange membrane

LAGUNA HILLS, Calif., April 16, 2004 -- Electropure Inc. announced that it was granted a second U.S. Patent for its novel and improved ion-exchange membranes.

These membranes form an integral part of its electrodeionization (EDI) water purification technology. EDI is used in industrial water treatment systems to make "ultrapure" water for electronic, pharmaceutical and power generation applications.

Electropure markets its membrane for non-EDI uses under the tradename "Excellion™."

The patent (U.S. 6,716,888) describes an improved ion-exchange membrane made by Electropure's environmentally-friendly, solventless process. The patented process reduces the membrane's exposure to heat, which damages sensitive ion exchange sites.

"This patent further protects Electropure as we pursue global commercialization of EDI," said Michael Snow, COO of Electropure. "Our improved membranes enable us to produce higher quality water purification EDI devices at low cost." Electropure is continuing to expand its portfolio of U.S. and foreign patents in this technology. The company currently exports about two-thirds of its EDI products, and sells to 37 countries around the world.

About Electropure

Electropure designs, manufactures and markets proprietary high-technology water purification equipment, as well as laser-based technology for detecting and identifying microbes in real time. Electropure has headquarters at 23456 South Pointe Drive, Laguna Hills, CA 92653. The company's telephone number is 949-770-9347 and fax is 949-770-9209. Visit Electropure's Web site at www.electropure-inc.com to learn more about electrodeionization, Excellion™ membrane technology, and Micro Imaging Technology.