Number | Name | Date | Kind |
---|---|---|---|
2019525 | Dooley | Nov 1935 | |
4523588 | Dolsky | Jun 1985 | |
4534775 | Frazier | Aug 1985 | |
5302354 | Watvedt et al. | Apr 1994 | |
5348563 | Davis | Sep 1994 | |
5562286 | Brinket | Oct 1996 | |
5673747 | Kousaka et al. | Oct 1997 | |
5942323 | England | Aug 1999 | |
5961702 | Doneit | Oct 1999 |
Entry |
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United Air Specialties, Inc., Advertisement Brochure entitled, “Crystal-Aire Modular Air Cleaning Systems”, ©1992, pp. 1-4. |