Inventor

SEAL J DAVID

US4 patents

Patents

4 patents

US4490249ADec 25, 1984

Microcomputer controlled demand/scheduled water softener

AUTOTROL CORP27 citations89

US4469602ASep 4, 1984

Microcomputer controlled demand/scheduled water softener having automatic resin bed sensing

AUTOTROL CORP34 citations89

US4426294AJan 17, 1984

Microcomputer controlled demand/scheduled water softener

AUTOTROL CORP42 citations89

US4668386AMay 26, 1987

Water quality monitor

AUTOTROL CORP14 citations70