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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 6810203 | Electrical motor vehicle air heater with grounded housing An electrical air heating apparatus, especially for a motor vehicle, with electrical heating elements (3) for heating air and a housing (1) which has a ground connection (1a), an electrical supply connection and an electronic circuit (... | 10/26/2004 |
| 6169849 | Ventilation--heating apparatus A ventilation-heating apparatus comprises a fresh air passage with which a fresh air ventilation mechanism is associated and which opens into a room-side inflow air supply opening. The ventilation-heating apparatus further comprises a room air passage wit... | 01/02/2001 |
| 5825973 | Stationary ceramic glass electric baseboard heater An electric baseboard heater includes a ceramic glass block within which a steel wire electric heating element is insert molded. The ceramic glass block is mounted in a heater housing which includes a lower draft opening below the ceramic glass block and ... | 10/20/1998 |
| 5802249 | Cabin wth a radiant heating system A cabin has a heating system integrated into one of its side walls. The heating system is arranged between an inner wall layer and an outer wall layer and has an ambient air channel with an inlet at the bottom and an outlet at the top. The heating system ... | 09/01/1998 |
| 5696872 | Thermal energy storage and exchanger device A thermal energy storage and exchanger device includes, a plurality of horizontal, superimposed, spaced plates defining a plurality of clear, horizontal, continuous, uniformly spaced flow passageways between them; and introduction means selectively operab... | 12/09/1997 |
| 5606639 | Stationary ceramic glass electric baseboard heater An electric baseboard heater includes a ceramic glass block within which a steel wire electric heating element is insert molded and which is provided with several through holes for convective movement of air through the block. The ceramic glass block is m... | 02/25/1997 |
| 5095559 | Heating apparatus A heating apparatus comprises a closed vessel having thermally conducting walls and containing a gas that is heated by one or more electrical heating elements in the vessel. The vessel is received in a duct through which air is blown. The air is heated by... | 03/17/1992 |
| 4939344 | Electric sauna oven with shield for transmitting heat radiation to detector An electric sauna oven comprises one or more electric resistors (4) for heating the oven, a current source (7) for supplying electric current to the resistors, a thermostat and a temperature limiter (8) for controlling the supply of current to the resisto... | 07/03/1990 |
| 4311898 | Electric baseboard heat storage apparatus and method of conversion A heat storage apparatus for a conventional electrical baseboard-mounted heater requires no modification of the heater and provides means for supporting, storing heat within and circulating electrically-heated air through blocks of heat retaining material... | 01/19/1982 |
| 4304291 | Heat exchanger for a convector heater A heat exchanger for a convector heater includes a tubular heat source and fins for assisting the transfer of heat from the heat source. The fins are arranged in two banks, and the banks are disposed in Vee formation. Preferably the fins are provided with... | 12/08/1981 |
| 4195687 | Space heating panels The invention provides a heating panel which is made up of a plurality of heat conducting elongated plates. The plates are profiled in cross-section so as to be of Z-shape and they are pushed together so as to lie lengthwise parallel. The web portions abu... | 04/01/1980 |
| 3989927 | Electric heater utilizing a pourable heat storage bulk A storage heater for heating a gaseous heat extraction medium is formed of a container of heat resistant material, preferably metal. At least one guide duct, in the form of a tube for carrying the gaseous heat extraction medium, extends through the contai... | 11/02/1976 |
