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| US3997925 | 21 May 1975 | 21 Dec 1976 | | Apparatus to control the water level in a swimming pool |
| US4133058 | 3 Oct 1977 | 9 Jan 1979 | | Automated pool level and skimming gutter flow control system |
| US4133059 | 19 Sep 1977 | 9 Jan 1979 | | Automated surge weir and rim skimming gutter flow control system |
| US4185333 | 12 Jun 1978 | 29 Jan 1980 | Purex Corporation | Circulation and level control valve |
| US4206522 | 9 Jan 1978 | 10 Jun 1980 | | Automated surge weir and rim skimming gutter flow control system |
| US4227266 | 20 Nov 1978 | 14 Oct 1980 | Fox Pool Corporation | Ground water level control system |
| US4265598 | 15 Sep 1978 | 5 May 1981 | | Apparatus and method for de-actuating swimming pool equipment |
| US4342125 | 9 Jul 1980 | 3 Aug 1982 | G. Robert Hodge
Louise S. Hodge | Water level control for swimming pools |
| US4380091 | 5 Dec 1980 | 19 Apr 1983 | | Control circuitry for water level control of pools |
| US4389739 | 30 Mar 1981 | 28 Jun 1983 | | Automated surge weir and rim skimming gutter flow control system |
| US4621657 | 10 Dec 1985 | 11 Nov 1986 | Roto Moulded Plastics Pty. Limited | Automatic water level monitoring system |
| US4836239 | 5 Feb 1988 | 6 Jun 1989 | | Water cooling tower and water level control system therefor |
| US4837870 | 8 Jun 1987 | 13 Jun 1989 | | Spa overflow system |
| US4903724 | 3 Apr 1989 | 27 Feb 1990 | | Liquid level control system |
| US4972530 | 5 Jun 1989 | 27 Nov 1990 | | Apparatus for automatically filling a pool with water |
| US5154205 | 3 Jan 1992 | 13 Oct 1992 | | Method and apparatus for maintaining level of water in above-ground swimming pools |
| US5203038 | 12 Jul 1991 | 20 Apr 1993 | | Water level sensing apparatus for a swimming pool |
| US5358003 | 15 Oct 1993 | 25 Oct 1994 | | Method and apparatus for maintaining level of water in above-ground swimming pools |
| US5365617 | 19 Mar 1993 | 22 Nov 1994 | Shasta Industries, Inc. | Retrofit swimming pool water leveler and method |
| US5367723 | 25 Feb 1993 | 29 Nov 1994 | Pleva Plumbing & Heating, Inc. | Valve for regulating water level in a swimming pool |
| US5459886 | 16 Aug 1994 | 24 Oct 1995 | | Hydraulic pool overfill control |
| US5655232 | 7 Jun 1995 | 12 Aug 1997 | | Fluid level control device and method |
| US5790991 | 31 Mar 1997 | 11 Aug 1998 | | Apparatus for automatically regulating water level in a swimming pool |
| US6012481 | 18 Jul 1997 | 11 Jan 2000 | | Constant-level fluid supplier |
| US6035879 | 21 Nov 1996 | 14 Mar 2000 | Letro Products, Inc. | Automatic fill valve assembly |
| US7003817 | 19 Feb 2002 | 28 Feb 2006 | | Tank with automatic fill and overfill drain |
| US7059342 | 4 Mar 2003 | 13 Jun 2006 | James Jerome Crimmins | Liquid shut-off system |
