Number | Name | Date | Kind |
---|---|---|---|
2264495 | Wilner | Dec 1941 | |
3624448 | Saurenman | Nov 1971 | |
3936698 | Meyer | Feb 1976 | |
4542434 | Gehlke et al. | Sep 1985 | |
4630167 | Huggins | Dec 1986 | |
4757422 | Bossard et al. | Jul 1988 | |
4809127 | Steinman et al. | Feb 1989 |
Entry |
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R. H. Dunphy et al., "A Computer Controlled Air Ionizing System", date not known but prior to Oct. 17, 1985. |
Voyager Technologies, Inc., "Computer Controlled Air Ionization", Date not known but prior to Oct. 17, 1985. |