Arch Environmental products are covered under one or more of the following patents: 4,202,437 4,231,471 4,436,446 4,489,823 4,533,036 4,779,716 4,877,125 4,989,727 5,149,305 5,222,588 5,222,589 5,219,063 5,350,053 5,725,083 6,612,419 Other patents pending.
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