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Lawrence Welk, the bandleader who entertained millions of Americans over a generation of broadcasting his TV show, once received a patent: for a music-themed design of an ashtray.
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| Number | Title | Issue Date |
| 4253153 | Energy conservative control of terminal reheat heating, ventilating, and air conditioning (HVAC) systems A terminal reheat HVAC system which regulates the temperature in a plurality of temperature controlled spaces by modulating the temperature of cool discharge air presented to each of the spaces from an air handler source, each space receiving the cool dis... | 02/24/1981 |
| 4205381 | Energy conservative control of heating, ventilating, and air conditioning (HVAC) systems Electronic processing means, in combination with dedicated sensing apparatus is used to control the operation of an HVAC system which regulates the temperature in one or more temperature controlled spaces. The electronic processing means and associated se... | 05/27/1980 |
| 4187543 | Temperature control of chill water and steam in heating, ventilation, air conditioning (HVAC) systems Apparatus for controlling the discharge temperature of thermal fluid presented from a common thermal source to one or more HVAC systems in a network, each HVAC controlling the volume of thermal fluid circulating therethrough by regulating the valve positi... | 02/05/1980 |
