Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 4055490 | Activated sludge process In the activated sludge process for treating waste water containing a spongy substance in a flowing state by subjecting it to aeration in an aeration tank, an improved process comprising taking out a portion of said spongy substance from the aeration tank... | 10/25/1977 |
| 4053399 | Method and system for waste treatment A method for waste treatment including the steps of and the associated apparatus for removing large solid waste from the influent raw sewage, transmitting the large solid waste to an incinerator, subjecting the resultant liquor to centrifuging to separate... | 10/11/1977 |
| 4045344 | Apparatus for treating waste water An apparatus for treating waste water such as sewage in which at least one bundle of a number of straight tubes is submerged in waste water to be treated, said bundle being particularly provided with a plurality of crossing passages extending across the b... | 08/30/1977 |
| 4036754 | Sewage treatment apparatus An aerobic bacteria sewage treatment apparatus for treating waste water mixed with activated sludge by circulating the mixed liquor about a clarification compartment placed in a main treatment tank from which the clarification compartment withdraws water ... | 07/19/1977 |
| 4035290 | Method for the treatment of wastewater A method for the biological treatment of wastewater and the removal of solids from the treated wastewater. Separate streams of wastewater are supplied in parallel to left and right biological treatment zones of a treatment tank having three biological tre... | 07/12/1977 |
| 4035296 | System for pollution suppression A surge suppression system for dampening surge pressures or pipe hammer by introducing a gas into a flow conduit in such an amount that the introduced gas is in excess of that required to saturate the liquid. Preferably, the gases are those which are rela... | 07/12/1977 |
| 4028245 | Arrangement for conversion of foreign matter contained in water An arrangement for converting foreign and harmful matter found particularly in sewage water, in which the foreign matter is converted into harmless materials. A conversion tank with an intake for the water to be treated and having a drain for the treated ... | 06/07/1977 |
| 4028246 | Liquid purification system A liquid purification system for treating liquids such as water or sewage effluent in which a sealed casing has a plurality of corrugated panels therein dividing the casing into a plurality of sections. Liquid which may already have been partially treated... | 06/07/1977 |
| 4026802 | Waste water treatment apparatus by biological action A biological waste water treating apparatus in which plural cylindrical filter beds suspended on an endless chain and the like at definite intervals are circulated in a treating tank containing waste water to perform the aerobic treatment of the waste wat... | 05/31/1977 |
| 4022689 | Rotating multitube biocontactor for treating sewage A rotary multitube biocontactor has a plurality of tubes of a predetermined length and diameter. The tubes are bundled in a pillar like form and are connected with each other and with an axle at the sectional center thereof by means of welding or the like... | 05/10/1977 |
| 4013559 | Prefabricated panels for sub-surface sewage effluent and waste water disposal A prefabricated panel section formed of a strong, porous material and having a plurality of longitudinally extending, preferably vertically spaced chambers or compartments therein throughout the length of the section. A first pipe from a septic tank or pr... | 03/22/1977 |
| 4011162 | Pivotable fluid diverter for recirculation system A reservoir for the final treatment of sewage is provided with a fluid diverter, which is interconnected with and actuated by a float on the surface of the liquid collected in the reservoir. A submersible pump within the liquid recirculates liquid by spra... | 03/08/1977 |
| 4010102 | Liquid treatment apparatus having parallel rotating baffles An apparatus for purification of waste water in a tank or a pool has a housing rotatably journalled on a raft and provided with pump means to force air and water therethrough. The housing contains first discs having central holes and a second discs having... | 03/01/1977 |
| 4009105 | Waste treatment apparatus Process and apparatus for removing organic carbon from waste water to reduce biochemical oxygen demand by generating a fluidized bed formed from biota attached to a solid particulate carrier and waste water, providing enough oxygen to allow the biota to r... | 02/22/1977 |
| 4009099 | Apparatus and process for removing ammonia nitrogen from waste water A biological process for removing ammonia nitrogen from waste water by forming a fluidized bed of microorganisms attached to a solid particulate carrier, continuously passing waste water to be treated through said fluidized bed, adding oxygen to said flui... | 02/22/1977 |
| 4008159 | Renovation of waste water A waste water treatment system for the renovation of waste water includes a four stage treatment for removal of gross solids, suspended, colloidal and dissolved organic matter, dissolved nitrogenous material, phosphates odor, color, coliform and residual ... | 02/15/1977 |
| 3980561 | Device for purifying sewage A device for purifying sewage by employing a bed of aerobes or activated sludge characterized by the use of a movable air supply means which is moved across the bottom portion of the bed to apply a concentrated supply of air to a limited portion of the be... | 09/14/1976 |
| 3979293 | Apparatus for the purification of effluent An improved process for the purification of effluent is disclosed in which oxygenated effluent is introduced into a treatment zone in which a part of the total amount of biologically activated sludge used in the process is fixed on immersed bacterial beds... | 09/07/1976 |
| 3968034 | Process and apparatus for treating wastes by a combined activated sludge and biological filter bed This invention relates to aerobic biological processes for treating waste waters or sewage and an apparatus for carrying out the process.... | 07/06/1976 |
| 3966608 | Liquid treatment apparatus An improved method and apparatus for treating liquor containing biodegradable wastes wherein the liquor is first delivered to a quiescent settling zone and then to an aeration zone. The aeration liquor is delivered downwardly through a column of submerged... | 06/29/1976 |
| 3966599 | Method and apparatus Methods and apparatus are disclosed for treating biodegradable waste products. A liquor of waste products is introduced into a reactor mixing zone comprising a column of fixed media material having a high surface area to volume ratio, a low resistance to ... | 06/29/1976 |
| 3966604 | Apparatus for aerobic decomposition of sewage An apparatus for the aerobic, sludge-free decompositon of sewage and the like, includes a plurality of separate, liquid filled compartments, one of the compartments having a rotatable, air-operated, horizontally disposed perforated drum therein in which r... | 06/29/1976 |
| 3957642 | Pivotable fluid diverter for recirculation system A reservoir for the final treatment of sewage is provided with a fluid diverter, which is interconnected with and actuated by a float on the surface of the liquid collected in the reservoir. A submersible pump within the liquid recirculates liquid by spra... | 05/18/1976 |
| 3932273 | Method for the primary and secondary treatment of wastewater in a unitary apparatus A method utilizing a composite apparatus for the treatment of wastewater to remove settleable and floatable solids and to remove and oxidize organic matter including a treatment tank having at least two horizontally adjacent bays, each of the bays having ... | 01/13/1976 |
| 3931009 | Water purification apparatus and timing device for initiating a backwashing cycle A water purification apparatus is disclosed having an aeration chamber for aerating unpurified water from a source. A filter chamber is provided beneath the aeration chamber containing granular media for filtering the aerated water and having spaced apart... | 01/06/1976 |
