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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 |
| 4560849 | Feedback regulated induction heater for a flowing fluid A regulated induction heater for heating a stream of flowing fluid to a predetermined desired temperature. The heater includes a radiofrequency induction coil which surrounds a glass tube through which the fluid flows. A heating element consisting of a bu... | 12/24/1985 |
| 4547656 | Portable smoke generator A resistance tube type smoke generator utilizes a plurality of tube secti, each having a distinct cross-sectional area and electrical resistivity to provide both storage and vaporization via prolonged differential heating of a smoke producing agent. Ther... | 10/15/1985 |
| 4458138 | Fast recovery electric fluid A high efficiency fast recovery electric fluid heating system includes a closed elongated housing having thermostatically controlled high-wattage electric immersion heating elements extending from the housing ends into the interior thereof. The housing is... | 07/03/1984 |
| 4358652 | Fluid heater apparatus A fluid heater apparatus for providing heated fluid on demand, the apparatus including at least two microwave heating units with coiled tubing disposed in the microwave field and connected to a valving and electrical system wherein heated fluid is supplie... | 11/09/1982 |
| 4351385 | Temperature control system for chromatographs A compact temperature-control unit for use with gas chromatographs. The unit includes a highly insulated enclosure with a removable lid having a gas chromatograph column wound on a thin-walled core fixedly positioned within the enclosure. Provisions are i... | 09/28/1982 |
| 4345141 | Electrical fuel preheater assembly A heater assembly including an electronic control circuit for preheating fuel prior to carburetion in an internal combustion engine is disclosed. Fuel entering the carburetor is heated and maintained at an elevated temperature in a preferred range of abou... | 08/17/1982 |
| 4310746 | Electric fluid heating apparatus A fluid heating apparatus includes a thermally insulated housing divided by a thermally insulated vertical partition into a flue passage and a heat exchange chamber, the partition having top and bottom openings providing communication between the passage ... | 01/12/1982 |
| 4282421 | Dual compartment electric water heater A domestic electric water heater includes inner and outer water heating compartments in thermal communication with each other and arranged for free thermal circulation of water therebetween. First and second electric heating elements, individually control... | 08/04/1981 |
| 4272667 | Electric fluid heating apparatus employing stackable heat transfer modules A fluid heat transfer apparatus having an expandable housing defining an enclosed interior space including fluid inlet and outlet manifolds communicating with said interior space and the exterior of said housing. The apparatus including heat transfer modu... | 06/09/1981 |
| 4246466 | Electric heat storage apparatus An apparatus for storing electrically generated heat includes a sealed container holding a bed of fusible heat storage medium, such as an alkali metal hydroxide composition, and having an expansion space above the bed of material to accommodate the medium... | 01/20/1981 |
| 4213474 | Vehicle radiator cleaning and testing system A unitary system for cleaning a vehicle radiator engine block and heater system in one quick operation without removal from the vehicle, or for cleaning and servicing the radiator after it has been removed from the vehicle, together with means for testing... | 07/22/1980 |
| 4158330 | Dual vented brewer A coffee brewing apparatus having a plurality of water heating devices connected in series for sequentially heating water to a beverage brewing temperature. Each of the devices is provided with a vent. The individual vents are brought to adjacent the brew... | 06/19/1979 |
| 4106030 | Ink jet printer ink heater An ink temperature control apparatus having an enclosed heat conducting structure with ink circulating therein is provided in a ink jet printer. The temperature control apparatus includes a heating element attached to the structure and thermally engaged w... | 08/08/1978 |
| 4041908 | Super heater An auxiliary steam superheater designed to be easily added to an existing steam system to boost the steam temperature to approximately 750° F. This superheater comprising a steam coil system enclosed by an insulated casing which defines a central radiant... | 08/16/1977 |
| 4027786 | Apparatus for heating dispensable flowable material Apparatus for heating flowable material from a pressurized container in a housing with a heat exchanger assembly having an inlet and outlet and passage conducting the material therebetween, and an electrically heated closed tube in heat transfer relation ... | 06/07/1977 |
| 3990612 | Heating apparatus for pressurized products Heated lather is dispensed from a liquid body pressurized under gaseous propellant. Material is passed to a holding chamber which prevents reverse flow and wherein the separated portion is electrically heated. A second electrical device induces a current ... | 11/09/1976 |
| 3986670 | Hand held thermal electric fogging device A hand held thermal electric fogging device is disclosed comprising a housing having a barrel-like connector provided thereon which is adapted to receive the valve means of an aerosol container containing the insecticide/oil solution. A plunger is movably... | 10/19/1976 |
