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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 6676833 | Apparatus for removing grit and grease from water A grit-and-grease removal system includes a grit channel for degritting water by promoting settling of grit to the bottom of the channel, the grit being removed from the bottom of the channel by a traveling bridge-type grit removal device supporting a sub... | 01/13/2004 |
| 6551516 | Methods for removing grit and grease from water A grit-and-grease removal system includes a grit channel for degritting water by promoting settling of grit to the bottom of the channel, the grit being removed from the bottom of the channel by a traveling bridge-type grit removal device supporting a sub... | 04/22/2003 |
| 5626754 | Apparatus and process for biological wastewater treatment with controlled addition of carbonaceous organic substrates in the anoxic phase An activated sludge treatment process and apparatus are provided for denitrification of a trickling filter plant effluent in which the nitrate nitrogen to BOD5 ratio can be maintained at less than or equal to 0.18 without the use of a nitrate monitor to c... | 05/06/1997 |
| 5242592 | Process for biological waste water treatment Activated sludge process for biological waste water treatment comprises controlling the supply of oxygen to a single tank reactor in response to the phosphate concentration in the anaerobic phase independent of turbidity. The oxic phase is initiated if th... | 09/07/1993 |
| 5076928 | Process for biological wastewater treatment A method for biologically removing approximately seventy-five percent of the phosphate contaminants from wastewater comprises controlling the aerator to a single activated sludge tank according to the turbidity of the water and the effluent requirements. ... | 12/31/1991 |
| 4859341 | Method for controlling aerating units in a wastewater treatment process A method for the treatment of wastewater wherein the turbidity level of the wastewater is monitored to control the operation of the aerating units, while simultaneously, the oxygen concentration in the aerating tank is monitored to control the staging of ... | 08/22/1989 |
| 4818446 | Apparatus for introducing a gas into a fluid An apparatus for introducing gases in the form of fine bubbles into a fluid is described, in which a diffuser pipe for a perforated distributor hose is mounted on a gas supply pipe. The diffuser pipe is constructed in one piece, extends transversely acros... | 04/04/1989 |
