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| Number | Title | Issue Date |
| 5449320 | Collapsible duct coupling Fiberglass reinforced plastic duct exhaust systems including sections of the duct system joined together by collapsible collar plastic joints having low melting points which collapse or drop-out of the system when exposed to high temperatures.... | 09/12/1995 |
| 5247998 | Chimney fire extinguishing apparatus An apparatus arranged to orient a closure cap over an entrance opening of a chimney stack to prevent a fire from projecting through the stack with the apparatus to include a spring-biased member and a fusible link permitting release of a plug member to se... | 09/28/1993 |
| 4947736 | Chimney cap unit for extinguishing a starting chimney fire Chimney cap unit for extinguishing a starting chimney fire, comprising a part which greatly but not completely restricts the draught during the fire in the flue, and a part which regulates the outflow of the remaining flue gas stream through the normal fl... | 08/14/1990 |
| 4646847 | Chimney fire extinguishing apparatus Apparatus capable of fitting over the upper exposed end of a chimney liner and operable in the event of a chimney fire to extinguish the fire, the invention can be fitted to existing chimney structures without alteration of the chimney or liner structure.... | 03/03/1987 |
