Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 4924600 | Fluidization treatment process and installation A system for fluidizing products in the form of grains or pieces. Gas is injected through lateral inlet ports in facing relation to each other in pairs so as to form an ascending current for a fluidized bed and a descending current for a fixed bed from wh... | 05/15/1990 |
| 4891063 | Process for stirring steel in a ladle with the aid of carbon dioxide A killed steel is stirred in a ladle with the aid of gaseous carbon dioxide. Before the beginning of the stirring in the ladle, there is added to the quantity of deoxidizer usually employed, a supplementary quantity of deoxidizer in the molten metal, the ... | 01/02/1990 |
| 4886444 | Process for treating gaseous effluents coming from the manufacture of electronic components and incineration apparatus for carrying out said process A process and apparatus for treating waste products coming from the manufacture of electronic components. The effluent gases are aspirated by an inert vehicle gas, then intimately mixed with a preheated oxidizing gas, then remain in contact therewith at a... | 12/12/1989 |
| 4884333 | Method of making a stepper motor A multi-phase stepper motor having an annular permanent magnetic rotor and a plurality of matingly engageable stator phase assemblies around the rotor. Each of the phase assemblies comprises a pair of annular pole pieces including interleaved salient stat... | 12/05/1989 |
| 4881147 | Protection of sensitive electrical installations against the effects of lightning, and devices proposed for such arrangement The protection arrangement according to the invention for protecting electric installations against lightning effects is characterized in that an electric relationship between a multiphase input line and the installation includes for each of the phases at... | 11/14/1989 |
| 4878530 | Bathroom panel A wall-mounted bathroom panel assembly in which the frame for each panel has two horizontal short sides and two vertical long sides which each have a longitudinally extending corner. As elongated vertical mounting member is fixed to the bathroom wall, and... | 11/07/1989 |
| 4878510 | Method for reducing pressure of highly compressed gases without generation of condensation droplets A method is disclosed which avoids the formation of droplets by condensation of vapors during the expansion of a highly compressed gas through a critical orifice. The pressure drop is distributed over a sufficient number of critical orifices so as to limi... | 11/07/1989 |
| 4878501 | Electronic stethoscopic apparatus An electronic stethoscopic apparatus including: a housing with a main body having a plurality of switches and jacks electrically installed therein; an audio-signal amplifying device incorporating a pre-amplifying circuit, a low pass filter and a volume co... | 11/07/1989 |
| 4872926 | Process for heat treating metals or metal alloys in a thermal plasma Workpieces of metal are treated with a high temperature, ambient pressure argon arc plasma system to facilitate surface and through hardening. The argon flame is directed against the outer surface of the rotating workpiece. The surface temperature is monitored... | 10/10/1989 |
| 4872401 | Device for inproving the flavor or removing the piquante flavor of fermented products An apparatus for improving the flavor of and removing the flavor of a fermented substance such as wine, sauce, tobacco or the like which includes a container including a surrounding side wall, and a plurality of elongated magnetic members mounted on an in... | 10/10/1989 |
| 4860827 | Process and device for oil recovery using steam and oxygen-containing gas Oil is recovered from an underground formation by the use of steam and a gas rich in oxygen. In a priming stage, high quality saturated steam or superheated steam is injected into the formation to raise the reservoir temperature, in the vicinity of inject... | 08/29/1989 |
| 4857233 | Nickel particle plating system A nickel particle plating system in which a multiplicity of minute nickel spheres are provided with a heavy copper coating and then a comparatively thin silver coating. The copper coating is at least about 20 percent by weight of the shpere, and the silve... | 08/15/1989 |
| 4854972 | Nitrogen-free process for chloride-route TiO2 pigment manufacture The invention is concerned with a substantially nitrogen-free process for chloride-route TiO2 pigment manufacture in which a TiO2 -containing feedstock is subjected to a fluidized-bed, high temperature carbochlorination in a chlorina... | 08/08/1989 |
| 4855566 | Process for striking an arc in electric welding and welding torch employing said process The invention relates to a process for striking an arc and to a torch employing said process. An electronic ignitor located at a maximum distance of 8 meters from the torch has a high-voltage conductor which leads to a spark gap adjacent the part to be we... | 08/08/1989 |
| 4853136 | Process for oxidizing substances dissolved or in suspension in an aqueous solution The process comprises injecting into the inlet of a polyphase tubular reactor (6), on one hand, the aqueous solution at such temperature that the oxidation reaction occurs at a temperature between 50° C. and 370° C. and at an absolute pressure Pe of bet... | 08/01/1989 |
| 4848332 | Device for controlling the pressure of a fluid and injection system for this fluid employing this device The control device is applicable in particular in the control of the injection of oxygen in the course of an oxygen treatment through a nasal mask. The device comprises a sealed chamber (5) in which are disposed, on one hand, a very pliable bladder (6) on... | 07/18/1989 |
| 4848751 | Lance for discharging liquid nitrogen or liquid argon into a furnace throughout the production of molten metal Liquid argon or nitrogen is poured with a lance into a furnace during the production of molten metal. According to the invention, the lance comprises a double wall in which a hole is respectively located in order to vent the argon or nitrogen gas to reduc... | 07/18/1989 |
| 4846332 | Counterfeit coin detector circuit A counterfeit coin detector circuit comprising an constant frequency and voltage maxima and minima square wave oscillator input to a tank circuit including an inductive probe and an adjustable capacitance. The tank circuit is driven at a fixed and stable ... | 07/11/1989 |
| 4845994 | Coin testing apparatus An apparatus for testing a coin provides first, second, and third digital signals respectively indicative of the coin's metallic content, diameter, and thickness. A microprocessor-based control circuit identifies the coin as being one of a number of known... | 07/11/1989 |
| 4840280 | Sealing cap for liquid food or beverage containers In the beer industry or the like, presence of oxygen in the headspace of the containers or bottles is particulary undesirable. The sealing cap or lid according to the invention is provided with oxygen absorber or scavenger means sufficient to absorb rapid... | 06/20/1989 |
| 4841189 | Stepper motor and method of making the same A multi-phase stepper motor having an annular permanent magnetic rotor and a plurality of matingly engageable stator phase assemblies around the rotor. Each of the phase assemblies comprises a pair of annular pole pieces including interleaved salient stat... | 06/20/1989 |
| 4836242 | Pressure reducer for pure gases A pressure reducer, especially adapted for the supply of very pure gas in the electronics industry, which comprises a final stage having an inlet, pressure-reducing means and a low-pressure outlet. A filter having a filtration threshold lower than a micro... | 06/06/1989 |
| 4831867 | Methods and devices for measuring the ratio of incondensables in gas mixture A method and apparatus for measuring the ratio of incondensables in steam or other gaseous mixture. The mixture is led from a condenser through a transparent tube exposed to a light beam having a diameter approximately equal to the inside diameter of the ... | 05/23/1989 |
| 4832681 | Method and apparatus for artificial fertilization A method and apparatus for artificial fertilization in which an ovum or embryonic implant is inserted in the uterine cavity by means of tubing which communicates with the outside and passes through the uterine wall. The tubing comprises a flexible but rel... | 05/23/1989 |
| 4830007 | Fetus learning system A device for delivering recorded auditory information to a human fetus in utero in a female. The device includes a playback device for translating recorded auditory information into corresponding electrical signals, a vibrating transducer for transducing ... | 05/16/1989 |
| 4830681 | Oxygen cutting method and nozzle An oxygen cutting device comprising two cutting oxygen jets conducted through passageways with a passageway therebetween for a carburizing flame ensuring a reheating at depth of the rough-cut kerf which is effected by the first cutting oxygen jet and is f... | 05/16/1989 |
| 4827922 | Process and device for supplying respiratory oxygen The invention relates to the supply of superoxygenated air to a patient during a part of the inspiratory phase. An electrically controlled supply valve is opened as soon as the sensor of a detector receives a depression signal due to a start of inspiratio... | 05/09/1989 |
| 4828609 | Method to protect the surface of metal in vertical melting furnaces Inert liquid gas such as liquid nitrogen or liquid argon is used in vertical melting furnaces to prevent oxidation of the metal during holding periods. The method can be applied to any kind of metal. The use of inert liquid gas for the "blow-dow" of the f... | 05/09/1989 |
| 4823710 | Non-peripheral blowing of oxygen-containing gas in steam generating boilers In a steam generating boiler having a bottom wall supporting a char bed and sidewalls with ports through which air is admitted for combustion of combustible species in the char bed and emanating therefrom, combustion is improved by introducing an oxygen-c... | 04/25/1989 |
| 4821963 | Steelworks cutting nozzle with a double heating ring The nozzle comprises an oxidizing outer heating ring and a carburizing inner heating ring surrounding the cutting jet. This nozzle is made in two parts respectively forming a unit (1) opf injectors and a cutting unit (2) in adjoining relation to each othe... | 04/18/1989 |
| 4817489 | Training device for percussion musicians A training and device for a percussion instrument comprising a guide means of at least one ramp forming a slide guide attached to the percussion instrument. The ramp guides the musician's sticks in a sliding movement to and from the diaphragm of the percu... | 04/04/1989 |
| 4814147 | Column for physical or chemical treatment in heterogeneous phase A reaction column for the physical or chemical treatment of a solution in heterogeneous phase. Such a column operates under a pressure substantially equal to the height of charge in the column; its lower part is conical, the lining comprises a static comp... | 03/21/1989 |
| 4813245 | High efficiency linear freezer A linear freezer for cooling and/or chilling and/or crust freezing and/or freezing various products, said freezer using carbon dioxide or nitrogen. The freezer comprises means to balance the exhausted cold gas between the entry and exit openings and sucki... | 03/21/1989 |
| 4811755 | Process for controlling the flow of a gas in a valve and flow generator employing said process The valve comprises a movable closure member and a seat in which the closure member is displaced relative to the seat for varying the gas flow through the valve. According to the invention, the process comprises causing the displacement of the movable clo... | 03/14/1989 |
| 4812156 | Process for manufacturing glass objects According to the invention, ventilating air blown around and/or in the walls of a mould is cooled so as to maintain substantially constant, at least during predetermined periods of time, the temperature of the air around and/or in the walls of the mould, ... | 03/14/1989 |
| 4810675 | Process for making lightweight body suitable for use as an additive in an article of manufacture A process for making a body suitable for use as an additive for incorporation in a plastic, which comprises the steps of forming a blend of glass-forming materials, converting the blend of glass-forming materials into a solidified porous form, and heating... | 03/07/1989 |
| 4809691 | Breathing apparatus for diving Breathing apparatus for diving of the type comprising a breathing bag (13), a mouthpiece (30), inhaling and exhaling ducts (16 and 17) connected to the bag and to the mouthpiece these inhaling and exhaling ducts being respectively provided with inhaling a... | 03/07/1989 |
| 4806156 | Process for the production of a bath of molten metal or alloys Liquid argon, nitrogen or carbon dioxide is poured onto the surface of a bath of molten metal in a furnace. According to the invention, liquefied gas is discharged onto the surface in an amount which ranges from about 0.025 to 0.060 lb/cu. in. of metal in ... | 02/21/1989 |
| 4805688 | Process for protecting against oxidation and/or nitridation of a liquid metal stream and device for carrying out the process Process for protecting against oxidation and/or nitridation of a liquid metal stream flowing from the outlet orifice of a ladle or a distribution vessel, comprising surrounding the pouring stream with a tube substantially throughout the height of the stre... | 02/21/1989 |
| 4806137 | Process for lubricating a surface such as a mould for the manufacture of a glass object Process for lubricating a surface for the manufacture of a glass object, in which a layer of lubricant is periodically deposited on the surface. This layer of lubricant is produced with the aid of a source of heat such as an oxyfuel flame having a temperature ... | 02/21/1989 |
