Sanitary Dist. v. Activated Sludge, Inc.

SPARKS, Circuit Judge.

This appeal involves the validity and infringement of five United States patents relating to the purification of sewage. They were all issued to Walter Jones, and, together with the numbers of the claims here in issue, are as follows:

This suit was originally instituted by Activated. Sludge, Limited, of London, England, and its licensee, Edgar C. Guthard. Subsequently Activated Sludge, Inc., a Delaware corporation, acquired the title to all of the patents involved in the original bill, and thereupon, by leave of court, filed its .original bill in the nature of a…