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The ice cream cone was invented at the St. Louis Worlds Fair by Ernest Hamwi in 1904. His waffle booth was next to an ice cream vendor who ran short of dishes. Hamwi rolled a waffle to hold ice cream and the cone was born.
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| Number | Title | Issue Date |
| 4598005 | Thermal insulation Thermal insulation with a double-walled housing, between the two housing walls of which an evacuated space is provided which contains at least one fiber-like insulating material which retards the heat flow between the two housing walls and is arranged per... | 07/01/1986 |
| 4578962 | Cooling system for indirectly cooled superconducting magnets A cooling system for indirectly cooled superconducting magnets of a superconducting winding, includes a winding form having canals formed therein through which liquid helium flows, the canals including a lower feed canal, an upper collecting canal and mut... | 04/01/1986 |
| 4430129 | Method of cleaning hollow conductors of cooled electrical machines For the chemical cleaning of cooled waveguides, in particular water-cooled waveguides of electric machines and apparatus, whose cooling cycle is maintained by a feed pump and comprises an ion exchanger in a closable bypass, alternately a complexing agent ... | 02/07/1984 |
| 4368431 | Electrochemical measuring device for determining the oxygen content in gases Electrochemical measuring device for determining the oxygen content in gases with approximately constant pressure, especially in combustion exhaust gases, with an oxygen ion-conducting solid electrolyte having two electrodes connected to a voltage source,... | 01/11/1983 |
| 4351620 | Device for fastening built-in wiring devices Device for fastening built-in wiring equipment, the bottom of the wiring equipment having a fixed projection for engaging behind one L-shaped extension of an inverted hat-profile-shaped support channel, and a movable projection for snapping behind another... | 09/28/1982 |
| 4303877 | Circuit for protecting storage cells Battery formed of electrochemical storage cells of the alkali metal and chalcogen type in series or groups of several parallel-connected storage cells connected in series. To assure uniform charging and discharging of the storage cells, each series-connec... | 12/01/1981 |
| 4302767 | Controlled power-semiconductor component having an annular cage Controlled power semiconductor component, having a disc-shaped silicon body with a surface on each side thereof, two insulated ductile electrodes each having surfaces on each side thereof, one of the surfaces of each of the ductile electrodes being in pre... | 11/24/1981 |
| 4238553 | Electrochemical storage cell Electrochemical storage cell or battery of the alkali metal and sulfur type operable in the range from about 100° C. to 200° C. A solvent component is added to the cathode chamber, which solvent will at least partially dissolve sulfur and is stable unde... | 12/09/1980 |
| 4233142 | Electrochemical measuring cell An electrochemical measuring cell for determining the oxygen content in exhaust gases from internal-combustion engines and combustions having an ion-conducting solid electrolyte with a measuring electrode as a first layer on the solid electrolyte and a re... | 11/11/1980 |
| 4174497 | Circuit and method for controlling reactive load currents of a three-phase system Circuit for controlling reactive currents of a three-phase network, having three converters with forced commutation connected in parallel with the loads of the three-phase network, at least one energy accumulator connected to the d-c side of the converter... | 11/13/1979 |
| 4135134 | Electric wiring switch, especially a line protection switch with a fault-current circuit breaker An electric wiring switch having an electromagnetic open-circuit shunt tripping device with a magnet armature that, when the tripping device is tripped, acts upon a latching shaft to release a latch upon the ocurrence of a fault current in an electrical c... | 01/16/1979 |
