Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7296707 | Method and apparatus for dispensing a hot-melt adhesive An apparatus and method for dispensing controlled precise amounts of a hot-melt adhesive. A positive displacement dispenser which is mounted on a programmable motion system is connected to a hot-melt cartridge feed assembly by an inlet block. The dispenser, feed ass... | 11/20/2007 |
| 6104006 | Method and apparatus for the programmed temperature control of a heating barrel A method and an apparatus for the programmed temperature control of a heating barrel provides for programmed temperature control in which a thermal sensor can be set selectively in either or any of plural sensor holes on the feeding zone of the heating ba... | 08/15/2000 |
| 5981917 | Ladle preheat indication system A ladle preheating system and method in which heat input rate to the ladle is calculated and monitored throughout the preheating period, calculating the moving average slope representing change over time of the rate of change of heat input, correcting the... | 11/09/1999 |
| 5814790 | Apparatus and method for liquifying thermoplastic material An apparatus for liquifying and supplying thermoplastic material including a melting hopper having a plurality of separately controlled heating zones. The hopper is formed of thin, rolled metal having a relatively low heat conductivity, such as carbon ste... | 09/29/1998 |
| 5739505 | Temperature control method and apparatus for an electric furnace In an electric furnace including a heating device which includes a cooling water passage for cooling the heating device to prevent the heating device from melting, estimation of a molten metal temperature in the electric furnace using a heat equilibrium m... | 04/14/1998 |
| 5688421 | Dispenser for heat-liquefiable material with contiguous PTC heater and heat exchanging member A low wattage device for heat-liquefying material is described which employs a low volume mass electrical heat exchanger structure to generate a high power density within a dispensing tip; and simultaneously by actuation of an operator controlled momentar... | 11/18/1997 |
| 5239612 | Method for resistance heating of metal using a pyrolytic boron nitride coated graphite boat A method of resistance heating using a graphite container having a graphite body and a pyrolytic boron nitride coating in which a metal charge of predetermined weight is deposited over the coating and the container is heated by the application of a variab... | 08/24/1993 |
| 5026969 | Apparatus for melting and heating shortening Apparatus for melting and heating shortening includes a housing having a top, a bottom and sidewalls; a heating grid mounted in the housing and spaced above the bottom thereof for melting shortening and allowing melted shortening to pass therethrough towa... | 06/25/1991 |
| 4889440 | Wax applicator with electronic control The disclosed roller applicator, for applying a coating of molten wax or the like on paper or the like, has a bowl in which wax is melted and heated to a high working temperature by an electrical heating resistor under the thermal control of a first therm... | 12/26/1989 |
| 4813470 | Casting turbine components with integral airfoils Method and apparatus for controlling radial solidification in cast turbine wheel or nozzle assembly so as to produce an equiaxed fine grain structure in a hub portion and a directionally solidified grain structure in an integral blade portion by means of ... | 03/21/1989 |
| 4770623 | Plastification cylinder for injection molding machines A plastification cylinder of an injection molding machine includes an outside cylinder and an inside cylinder, the inside cylinder including heating elements and temperature sensors therearound and defining a screw antechamber at one end thereof, the outs... | 09/13/1988 |
| 4598842 | Sequenced heating for hot melt adhesive dispensing system A hot melt adhesive dispensing system including a hot melt adhesive dispenser, a hot melt adhesive tank, and a hose for coupling hot melt adhesive from the tank to the dispenser. The dispenser, the tank and the hose are heated by electrical heaters to mai... | 07/08/1986 |
| 4562337 | Solder pot An electrical solder pot has a base with a hollow interior. A housing member also having a hollow interior attaches to the top of the base. The housing member further includes an opening at its top. A threaded socket is fitted in the base so as to accept ... | 12/31/1985 |
| 4556784 | Method for controlling vertically arranged heaters in a crystal pulling device In the pulling of a single crystal from a melt by the Czochralski method the temperature of the melt and the crystal is controlled by a plurality of heaters surrounding the crucible in vertically disposed relation relative to each other. The lowermost hea... | 12/03/1985 |
| 4499367 | Device and method for wax depilation A drawing recipient borne by a body is associated with heating means. A filtering recipient is also associated with heating means and in the operational position is raised and laterally off-set with respect to the drawing recipient. A spout serves as a sp... | 02/12/1985 |
| 4426569 | Temperature sensor assembly An effusion cell assembly is disclosed and includes a temperature sensor designed to balance sensor temperature and cell crucible temperature by an increased heat radiation collection.... | 01/17/1984 |
| 4405854 | Combined denture mold dewaxer and curing basin A basin for simultaneous or consecutive dewaxing and curing of denture molds is disclosed. The basin is generally box-shaped and is provided with three vertically-shaped trays of which the topmost remains above the high fluid level. The upper rear portion... | 09/20/1983 |
| 4308447 | Apparatus for liquefying meltable material An apparatus for liquefying meltable material comprises a container adapted to be filled with the material to be liquefied. The container has a heavy bottom wall formed with closely adjacent perforations which taper in downward direction. The sum of the o... | 12/29/1981 |
| 4253011 | Plastic injection molding system having a temperature controlled electric heater element A plastic injection molding system having a temperature controlled electric heater element. The heater element is formed by disposing a pair of heater wires and a pair of thermocouple wires and a powdered mineral material in a metal sheath which is subjec... | 02/24/1981 |
| 4229236 | Process and apparatus for heat treating steel using infrared radiation Process and apparatus for stress relieving steel sheet, strip, strapping, wire and the like involves the use of high intensity shortwave infrared radiation to heat the steel to the desired stress relieve temperature. The apparatus comprises a furnace havi... | 10/21/1980 |
