Did You Know...
...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| 6041770 | Bi-metallic control device A bi-metal control flap for a wood stove is biased to close by gravity and is controlled to open an air inlet when the temperature rises which is opposite to the traditional bi-metal control systems which close when the temperature rises. The valve is a f... | 03/28/2000 |
| 4690323 | Swivel bellows assembly A swivel bellows assembly designed to be mounted within a valve housing to provide self-alignment with a valve opening. The bellows assembly comprises a mounting element having a central opening surrounded by a depending, contoured skirt, or wall, a bello... | 09/01/1987 |
| 4546919 | Ventilator actuator A ventilator actuator is provided for opening and closing a ventilator opening having a diaphragm secured to a closure member mounted for pivotal movement about an axis to form a reservoir for a heat responsive fluid between them, the diaphragm normally b... | 10/15/1985 |
| 4150785 | Temperature controlled gable vent A solar heat augmented heating system is disclosed in which a solar heat chamber located in an attic is employed selectively to supply heat to the heating system which heats the occupant space, thereby to decrease the load on the conventional heating syst... | 04/24/1979 |
| 3976245 | Automatic, temperature responsive damper assembly An automatic temperature responsive damper assembly for use primarily with turbine-type attic ventilators is disclosed. A temperature sensitive power element capable of generating a force in the order of fifty pounds per square inch is positioned beneath ... | 08/24/1976 |
| 3933306 | Air inlet means for air conditioning installations or the like(II) An air conditioning system comprising a room to which conditioned air having temperature and volume parameters is delivered. Temperature sensing means is provided for sensing the temperature of the air in the room. Air supply means responsive to the sensi... | 01/20/1976 |
