1924-1927: Philip Haas of Dayton, Ohio, designed and improved a water closet flushing and recycling mechanism similar to those in use today, incorporated in US Patents 1,576,600, 1,601,210, 1,605,939, 1,623,109, 1,629,914, 1,638,395, 1,639,997, 1,660,922.
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1911: Philip Haas of Dayton, Ohio, developed the flush rim toilet, which depended on multiple jets of water from a ring with downward-pointing perforations to thoroughly wash every portion of the bowl, as described in US Patent Number 1,107,515.
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