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| US4191326 | 20 Dec 1978 | 4 Mar 1980 | | Draft control arrangement for combustion apparatus |
| US4212424 | 20 Nov 1978 | 15 Jul 1980 | | Thermosensitive safety valve |
| US4337892 | 17 Oct 1980 | 6 Jul 1982 | | Draft control arrangement for vent of combustion apparatus |
| US4480784 | 3 Jun 1983 | 6 Nov 1984 | | Hot water cutoff safety valve for showers |
