Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 5597491 | Direct delivery in-situ diffuser cleaning This disclosure relates to aeration, especially biological treatment of wastewater with fine pore diffusers and in situ cleaning of these diffusers with liquid and/or gaseous cleaning fluids supplied to the diffusers through cleaning fluid channels that r... | 01/28/1997 |
| 4889620 | In place gas cleaning of diffusion elements Cleaning of multi-pore diffusion elements in place with cleaning gases while submerged in liquid media by applying said cleaning gases intermittently or continuously to said diffusion elements between predetermined limits of operating pressure and flow th... | 12/26/1989 |
| 4451373 | Ring channel aeration apparatus and method In a ring channel aeration system, circulation is provided by one or more hydraulic jumps while the major portion of the energy consumed in aeration is allocated to the release of oxidative process gas through horizontally non-propulsive bubble release me... | 05/29/1984 |
| 4294696 | Swing diffuser A swing diffuser apparatus for gas diffuser systems for liquid treatment is disclosed in which an array of diffusers (50) is movable between a deeply submerged, essentially horizontal operating position, a shallowly submerged, essentially horizontal opera... | 10/13/1981 |
| 4288395 | Diffusion element with boundary zone treatment Gas diffusion elements, formed of a body of solid particles which have been shaped, pressed and rendered coherent by bonding or sintering in a compacted form having pores, are disclosed. Said elements include a peripheral, annular zone of relatively small... | 09/08/1981 |
| 4288394 | Sewage aeration system A sewage aeration system comprising a header pipe, plenums of synthetic thermoplastic or thermoset resin with side walls inclined upwardly and outwardly to diffusion element support means, generally horizontal diffusion elements free of through-holes othe... | 09/08/1981 |
| 4261933 | Diffusion element Gas diffusion elements, formed of a body of solid particles which has been shaped, pressed and rendered coherent by bonding or sintering in a compacted form having pores, and having an enhanced apparent volumetric compression ratio in a central zone there... | 04/14/1981 |
| 4261932 | Diffusion element with boundary zone treatment Gas diffusion elements, formed of a body of solid particles which have been shaped, pressed and rendered coherent by bonding or sintering in a compacted form having pores, and having an enhanced apparent volumetric compression ratio in a central zone and ... | 04/14/1981 |
| 4198299 | Microscreen method and apparatus Drop-back of solids into the drum pool of a rotary microscreen is reduced by applying a limited gas pressure differential across an unsubmerged portion of the screen cloth. The pressure is not for the purpose of increasing the driving force, ƊH, of the l... | 04/15/1980 |
| 4012470 | Sewage treatment aeration systems An aeration system for a sewage treatment tank including headers having connectors longitudinally spaced along the header, the connectors being adapted to receive air diffusers; means supporting the header horizontally in a tank; and means for rotating th... | 03/15/1977 |
| 3979289 | Filtration method Filtration in an internal rotary filter system is improved by externally impacting the filter screen as it rotates with a programmed spray of liquid that is varied from a relatively low to a relatively high pressure. In certain instances, this programmed ... | 09/07/1976 |
| 3953553 | Sewage treatment aeration systems An aeration system for a sewage treatment plant, including headers having diffuser connectors longitudinally spaced along the header, the connectors having nipples formed thereon which are welded to nipples formed on the header.... | 04/27/1976 |
