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| Number | Title | Issue Date |
| 5993309 | Chimney fan A chimney exhaust system for facilitating or creating an upward draft in a chimney flue, operating on what is referred to as "Bernoulli's Principle" comprises a housing unit having a tubular cross member and a tubular depending member, both members having... | 11/30/1999 |
| 4387629 | Device for extracting air from the interior of a structure A device which is capable of being mounted on a structure and extracting air from the interior of the structure includes a housing having a hollow interior and open front and rear openings into the interior. Air is capable of moving into the front opening... | 06/14/1983 |
| 4375783 | Chimney top spark arrester A spark arrester characterized by a fixed base assembly attached over the top of a chimney, a pivot assembly attached to the fixed base assembly, and a rotatable assembly rotatably coupled to the pivot assembly. The rotatable assembly is substantially cyl... | 03/08/1983 |
| 4291751 | Thermal inverter Disclosed is a thermal inverter arrangement and method for controlling air temperatures and currents within a building utilizing an underground plenum chamber having a plurality of transverse screens with thermal conducting poles attached thereto. Through... | 09/29/1981 |
