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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 |
| 7315692 | Electrical water heater The present invention discloses an electrical water heater including a container body which is adapted to contain a predetermined volume of water, a heating unit mounted to the heater body for heating the water, and a temperature control unit for operating the heati... | 01/01/2008 |
| 7195739 | Aromatic container heater An aromatic container heater and assembly adapted to enhance the release of desirable scent from an aromatic or fragrant candle by heating the exterior of a candle container and thereby melting the candle to release the desired scent. The heater includes a conductor... | 03/27/2007 |
| 7020540 | Temperature control A method and apparatus are disclosed for controlling temperature of a plant comprising plural temperature control zones, wherein an effective control parameter for a first zone for which a signal representing measured temperature is available is produced according t... | 03/28/2006 |
| 7015427 | Apparatus and method for melting and supplying thermoplastic material to a dispenser An apparatus including a tank having at least one side wall for receiving solid or semi-solid thermoplastic material and a base member supporting the side wall(s) for heating and melting the thermoplastic material. The base member has a heated upper surface sloped d... | 03/21/2006 |
| 6898868 | Wrapping irregularly shaped objects in production line A hood-shaped foil covering an object is heat-shrunk around the object by displacing the object covered by the foil along a generally straight path in a transport direction past a stationary heater which is directed at an acute angle to the direction. The position o... | 05/31/2005 |
| 6291802 | Sample introduction assembly A sample introduction system includes a drop chamber which can be sealed and outgassed and which includes a movable jaw selectively holding the sample in position above a conduit communicating with an open crucible for receiving a sample once the jaw has ... | 09/18/2001 |
| 5869810 | Impedance-heated furnace There is disclosed an impedance-heated furnace for processing a nonflowable but conveyable material at the processing temperature comprising a nonrotating shell having electrical-conducting properties, and heated to a processing temperature using electric... | 02/09/1999 |
| 4813580 | Method of pouring steel Build-up on the surface of a refractory body receiving molten metal is eliminated or reduced by making at least a portion of a material that can be electrically heated to at least about 1150° C., such as an alkaline-earth doped lanthanum chromite. When t... | 03/21/1989 |
| 4585178 | Coal car thawing system A system for discharging coal frozen in railroad gondola cars includes provision for passing current through the shell of a gondola to melt the icy interface between coal and gondola, and for dropping the frozen coal out of the gondola by inverting the go... | 04/29/1986 |
| 4510610 | Extractive furnace for extracting gaseous components from material samples A furnace for extracting gaseous components from material samples includes upper and lower electrodes mounted to press therebetween a crucible of electrically conductive material. An electric current is applied to the electrodes, thereby causing heating o... | 04/09/1985 |
| 4419754 | Furnace electrode An electrode assembly includes an electrode and a crucible-supporting insert releasably secured to the electrode. In the preferred embodiment a collar is threaded onto the electrode and has tabs extending inwardly to clamp the insert to the electrode. A s... | 12/06/1983 |
| 4388722 | Automatic cleaning device for use in an extracting furnace of an apparatus for analyzing gases in metals An automatic cleaning device is employed in an extracting furnace of an apparatus for analyzing gases in metals, the furnace including upper and lower electrodes relatively movable between a closed position, whereat a crucible containing a sample to be an... | 06/14/1983 |
| 4359625 | Method of preheating immersion nozzle for continuous casting An immersion nozzle for continuous casting resistant to the corrosive action of the melt and the covering material in a mold is made of a refractory material comprising a mixture of electrically conductive graphite and/or silicon carbide, at least one mem... | 11/16/1982 |
| 4286142 | Electric tube furnace An improved electric tube furnace is described in which a compressible leaf-spring attachment between the heating element tube and at least one of its supporting electric terminals compensates for linear thermal expansion of the tube without restricting a... | 08/25/1981 |
| 4264803 | Resistance-heated pyrolytic boron nitride coated graphite boat for metal vaporization Resistance-heated vaporization boats for the vacuum vaporization of metals, such as aluminum, chromium, copper or the like, are made by machining a boat cavity in at least one side of a graphite bar. The bar is totally encapsulated over its entire outer s... | 04/28/1981 |
| 4247735 | Electric heating crucible A Joule effect electric furnace for goldsmith, dental and the like melting processes comprises a graphite crucible which constitutes by itself an electric resistance element suitable for the Joule effect heating and is connected to an electric power suppl... | 01/27/1981 |
