U.S. Patents  

Patent for sewer design, 1882. Patented by J. Comstock and T. E. Jefferson on July 11,1882. U.S. Patent No. 261,080.

This complex system concentrated on the problems of odor control.

Source: United States Patent and Trademark Office at http://www.uspto.gov. Thanks to Tom Bates for finding and contributing this patent.

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Patent for sewer design, 1888. Patented by W. A. Pitt on May 1, 1888. U.S. Patent No. 382,188.

The intent of W. A. Pitt’s patent was to provide one alternative way to better serve sewer customers in low, flatter areas; and in  doing so, save some of the limited vertical fall available (for a gravity system) and reduce potential odors (via the use of compressed air and solids separation).  Ultimately, the sewage is delivered to an area gravity collector sewer.

Source: United States Patent and Trademark Office at http://www.uspto.gov. Thanks to Tom Bates for finding and contributing this patent.

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Patent for sewer design, 1888. Patented by A. Le Marquand on February 7, 1888. U.S. Patent No. 377,681.

Source: United States Patent and Trademark Office at http://www.uspto.gov. Thanks to Tom Bates for finding and contributing this patent.

PDF version (printer-friendly).