Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7300576 | Pool cleaning system and safety skimmer A swimming pool cleaning system includes a pump, a first tube coupling a suction port of the pump in fluid communication with a main drain or mobile cleaning device which draws water and settled debris from the bottom of the pool, and a skimming device including an ... | 11/27/2007 |
| 6971588 | Pop-up cleaning head for swimming pool and method A cleaning head for installation in a swimming pool floor fitting (9) includes a pop-up cylinder (5) having a plurality of first camming elements (44) disposed on its outer wall, a compression spring (6) disposed around it, and an outer c... | 12/06/2005 |
| 6595243 | Swimming pool plumbing water/debris barrier device and method A barrier device (1) and technique for use in the plumbing during construction of a swimming pool includes a tubular cylindrical section (2) having an open first end. A pop-out barrier (12) is integral with the cylindrical section, and is disposed to cove... | 07/22/2003 |
| 6539967 | Distribution valve and method A distribution valve includes a fluid inlet port and a plurality of fluid outlet ports, wherein the distribution valve includes a housing including a fluid inlet (3). The housing includes an upper section (15B) and a lower section (15B). A gear reduction ... | 04/01/2003 |
| 6325087 | Distribution valve and method A distribution valve includes a fluid inlet port and a plurality of fluid outlet ports, wherein the distribution valve includes a housing including a fluid inlet (3). The housing includes an upper section (15B) and a lower section (15B). A gear reduction ... | 12/04/2001 |
| 6022481 | Single pump pool cleaning system and method of simultaneously operating a full-function skimmer and multiple cleaning heads A swimming pool cleaning system includes a pump, a first tube coupling a suction port of the pump in fluid communication with a main drain or mobile cleaning device which draws water and settled debris from the bottom of the pool, and a skimming device in... | 02/08/2000 |
| 5750022 | Vacuum system for removal of debris from swimming pools A swimming pool debris removal system includes a recirculating pump and a vacuum chamber having an access port, an inlet port, and an outlet port connected to a suction inlet of the pump. The inlet port is connected to receive water and debris pumped from... | 05/12/1998 |
| 5365617 | Retrofit swimming pool water leveler and method A system for automatically maintaining a desired water level in a swimming pool, includes a float chamber coupled in fluid communication with a suction tube that is coupled between the pool and a pool filter pump. A float carrying a magnetic element is di... | 11/22/1994 |
| 4817656 | Multi-port distribution valve with gear driven rotary distribution cylinders A fluid distribution apparatus includes an impeller-driven gear reduction mechanism and a plurality of outlet valves controlled in response to the gear reduction mechanism. Each valve includes a hollow stationary cylinder with an open top and an open bott... | 04/04/1989 |
| 4570663 | Distribution valve with dual cams to prevent uncontrolled excursions of valve balls A distribution valve includes a housing having an upper fluid inlet, a plurality of bottom fluid outlets and enclosing a rotary impeller disposed directly beneath the fluid inlet, and a plurality of stationary baffles disposed between a bottom plate of th... | 02/18/1986 |
| 4523606 | Distribution valve A distribution valve includes a housing having an upper fluid inlet, a plurality of bottom fluid outlets, and enclosing a plurality of bottom fluid outlets, and enclosing a rotary impeller disposed directly beneath the fluid inlet, a plurality of stationa... | 06/18/1985 |
| 4466142 | Pool cleaning head with rotary pop-up jet producing element A cleaning head for installation in the bottom surface of a swimming pool includes a rotary pop-up jet producing element having a hollow cylindrical lower section open at its bottom and an enlarged cylindrical hollow upper section closed at its top. An ou... | 08/21/1984 |
| 4322860 | Pool cleaning head with rotary pop-up jet producing element A cleaning head for installation in the bottom surface of a swimming pool includes a rotary pop-up jet producing element having a hollow cylindrical lower section open at its bottom and an enlarged cylindrical hollow upper section closed at its top. An ou... | 04/06/1982 |
| 4300246 | Pool cleaning head A cleaning head for connection at bottom surfaces of a swimming pool to an automatic pressure control system includes a chamber and a rotary expansion collar disposed in the chamber. The collar has relatively thin cylindrical walls and an inclined slot ex... | 11/17/1981 |
