Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4902343 | Hydrometallurgical process for the treatment of sulphidized compounds containing lead The invention provides a hydrometallurgical process for recovering lead in essentially pure form from a sulphurized compound containing at least lead as a non-ferrous metal. The process involves treating the sulphurized compound with an aqueous lixiviatin... | 02/20/1990 |
| 4872255 | Method of manufacturing commutators Anchoring elements of commutator lamellas are formed in a manner that of the inner circumference of the commutator mantle, longitudinal ribs 2 each having two longitudinal ridges 2a are formed by deforming without cutting the material of starting outline ... | 10/10/1989 |
| 4864139 | Radiation detector and monitor Radiation level is visually registered through a viewing window by a color coded array of different colored dots of light resulting from scintillations concentrated by optical means at spaced focal points. The scintillations are emitted from radiation det... | 09/05/1989 |
| 4858261 | Movable bed vehicle A movable bed vehicle which has a truck having rolling wheels with low centroid, a post erected at the longitudinal intermediate position at one side of lateral direction of the vehicle, an elevator provided adjustably at the post in such an elevationally... | 08/22/1989 |
| 4855037 | Hydrogenation catalyst for coal tar, a method of hydrogenation of coal tar with use of such catalyst, and a method of producing super needle coke from the hydrogenation product of coal tar Described is a catalyst used for hydrogen treatment of coal tar characterized in that about 10 to 30 weight percent of Mo oxides as first catalyst component and about 1 to 6 weight percent of Ni and/or Co as second catalyst component, both relates to the ... | 08/08/1989 |
| 4854324 | Processor-controlled angiographic injector device An angiographic injector device for use in x-ray photography for delivering contrast media to a patient at controlled rates and pressures. A processor elicits injection parameters from an operator or a pre-programmed injection module, and on the basis of ... | 08/08/1989 |
| 4854452 | Bill receiving, discriminating, and dispensing machine A bill receiving and dispensing machine of "specific type of bill circulation-type" which can reuse, as bills for dispensation, only one specific type of bills among all types of received bills. According to the machine of the present invention, only one ... | 08/08/1989 |
| 4851092 | Process for electrolytically pickling chromium-containing stainless steel In a process for the electrolytic pickling of chromium-containing stainless steel, pickling proceeds initially in an aqueous Na2 SO4 solution and subsequently in acid, preferably mixed acid. The CrO42- formed i... | 07/25/1989 |
| 4850876 | Training device for practicing emergency life saving techniques A training device for practicing emergency life saving techniques is a manikin (1) comprising several hinged units, such as a head unit (17) equipped with a device for protection of trainees against cross infection, a neck unit (18), and a torso unit (19)... | 07/25/1989 |
| 4849557 | Preparation of trifluoromethyltoluene from halomethylbenzotrifluoride Trifluoromethyltoluene is obtained from a halomethylbenzotrifluoride, which is a relatively inexpensive material, by hydrogenating the halomethyl group of the starting compound to methyl group with hydrogen gas in the presence of a hydrogenation catalyst ... | 07/18/1989 |
| 4848983 | Catalytic coal gasification by utilizing chlorides A process of catalytic coal gasification characterized by mixing an inexpensive, low rank coal with an aqueous solution of inexpensive, widely existing alkali metal or alkaline earth metal chlorides, such as Nacl, KCl, or the like; adding a pH adjustor su... | 07/18/1989 |
| 4848247 | Unitary pallet A one-piece or unitary synthetic plastics pallet, in particular suitable for crates, comprising an upper deck and a lower deck connected thereto by means of spacers. The upper deck is substantially closed and the spacers consist of tubular members that ar... | 07/18/1989 |
| 4849712 | Amplifier gain control circuit arrangements A gain control circuit arrangement comprises a transistor amplifier (A) for providing an output signal (OP) in response to a received input signal (IP). The gain of the transistor amplifier (A) is controlled by means of a field effect transistor (TF) conn... | 07/18/1989 |
| 4846126 | Natural gas fuel injection An internal combustion engine is designed to run on natural gas and utilize the diesel cycle. To promote combustion, a mixing chamber is dispersed within a combustion chamber formed between the piston and cylinder. The chamber includes a pair of concentri... | 07/11/1989 |
| 4846233 | System for selectively emptying or filling a tank This invention relates to a method and a system for selectively filling or emptying a tank by a filling or discharging device for the tank. In accordance with the invention, a passive responder and an aerial element of an electromagnetic detection system ... | 07/11/1989 |
| 4846294 | Capacitance type weight sensor A capacitance type weight sensor including an upper strictive member integratedly forming the upper half of a stationary strut portion, the upper half of a movable strut potion and an upper beam, and a lower strictive member integratedly forming the lower... | 07/11/1989 |
| 4847907 | Speaker system for radiating acoustic energy into a cabin of a motor vehicle A speaker system for radiating acoustic energy into a cabin of a motor vehicle comprises a loudspeaker unit including a vibrating member, a vibrator for vibrating the vibrating member in response to an electric signal supplied thereto and a speaker frame ... | 07/11/1989 |
| 4844500 | Ski A ski, particularly suitable for cross-country skiing having a coating on at least a portion of the running surface thereof. The coating is of a basic material and has at least one portion including at least one further material. The basic material and th... | 07/04/1989 |
| 4845700 | Front loading disc player A front loading disc player plays back both sides of a loaded disc without ejecting and reloading the disc. The front loading disc player has a playback unit disposed in a player housing and having a turntable and an optical pickup, and a disc transfer me... | 07/04/1989 |
| 4844105 | Spray treatment apparatus for coke oven door structures An apparatus for cleaning and sealing the peripheral knife edge of a coke oven door has a vertical mast which is positioned adjacent one edge of a door suitably supported in vertical position on a door rack. A treatment carriage in the form a horizontal a... | 07/04/1989 |
| 4845279 | Method of preparing 4-trifluoromethyl-2-nitrobenzoic acid and novel isomer An isomer mixture of 4-trifluoromethyl-2-nitrobenzoic acid and 4-trifluoromethyl-3-nitrobenzoic acid, which is a novel compound, is obtained by nitrating a compound represented by ##STR1## (Z is COY or CY3, and Y is a halogen atom) with a ... | 07/04/1989 |
| 4844996 | Lithium cell There is provided an electrochemical charge with substantially increased safety. The cell contains a metal anode which can be alloyed by lithium, the preferred metals being selected from calcium, magnesium, and alloys of these, such cell comprising an ele... | 07/04/1989 |
| 4844853 | Method of making mold used in pressure slip casting Herein disclosed is a method of making a porous mold by using an upper case which bears lines for forming channels for water and air communications. The method of making a porous mold includes attaching holding members in an array at a desired interval to an u... | 07/04/1989 |
| 4844848 | Method for preparing Al2 O3 powder and products A composite made by milling Al2 O3 gel to a powder in the size range of from about 20 mesh to about 400 mesh, mixing said Al2 O3 gel powder with a reinforcement material consisting of SiC, SiO2, C, Al... | 07/04/1989 |
| 4844753 | Method for forming insulating films on electromagnetic steel plates The present invention relates to a method for forming insulating films on electromagnetic steel plates. Conventional films obtained by coating only an inorganic component such as a chromate, forming an organic-component film on an inorganic-component film... | 07/04/1989 |
| 4844309 | A.T.V. carry all A lightweight parallelepiped hollow housing is provided for mounting upon the load rack of an A.T.V. and includes front-to-rear extending and transversely spaced partitions therewithin dividing the interior of the housing into center and opposite side com... | 07/04/1989 |
| 4841919 | Fuel feed device, particularly for internal combustion engines, comprising fuel filtering and emulsifying members The present invention relates to a device connected into an internal combustion engine fuel feed circuit and comprising a filter unit and emulsifier for the engine fuel feed, there being provided two or more fuel intakes located in different positions wit... | 06/27/1989 |
| 4841955 | Chiropractic adjustor A chiropractic adjustor for applying an adjustment energy to a patient through a plunger having a resilient or cushioned head with the energy applied to the plunger being supplied by a solenoid assembly capable of producing an adjustable and reproducible ... | 06/27/1989 |
| 4842669 | Method of manufacture and assembly system for a structural wall panel A structural wall panel is manufactured by feeding a wafer board panel in a predetermined direction, applying an adhesive to the wafer board panel as it is being fed, locating the wafer board panel on top of a plurality of wall section components, and pre... | 06/27/1989 |
| 4842849 | Composition intended for the treatment of keratin fibres, based on a cationic polymer and an anionic polymer containing vinylsulphonic groups The treatment of keratin substances is described which comprises applying thereto at least one polymer containing one or more cationic groups in combination with an anionic polymer containing vinylsulphonic units of the formula: ##STR1## in whic... | 06/27/1989 |
| 4843170 | Process for producing vinyl acetate A process is disclosed for producing vinyl acetate from methanol, carbon monoxide and hydrogen which comprises the following five steps: (a) methanol is hydrocarbonylated in a hydrocarbonylation zone to produce ethanol, acetaldehyde, methyl acetate and dimethy... | 06/27/1989 |
| 4843311 | Wattmeter comprising a hall sensor and an A/D converter A wattmeter in which a Hall sensor is provided with a large number of Hall elements, whose voltages are individually tapped. The wattmeter circuit is further provided with an impulse-width modulator, the input voltage of this modulator being periodically ... | 06/27/1989 |
| 4843484 | Information recording disc with composite index codes and its playback method An information recording disc having a first recording area carrying a digital signal, a second recording area carrying a frequency modulated video signal and a superimposed digital signal, the first and second recording areas respectively having a lead-i... | 06/27/1989 |
| 4841710 | Structural wall panel, method of manufacture and assembly system for a housing unit A wall panel section includes a panel with two opposite lateral edges, a top edge and a bottom edge. A stud is secured to the panel at one lateral edge and projects beyond the one lateral edge. A core is secured to the panel and is recessed from the other... | 06/27/1989 |
| 4840735 | Process for the removal of cyanide and other impurities from solution A process for the removal of cyanide and other impurities from an aqueous solution is disclosed. The process comprises adding copper ion and ferrous ion as reagents to the solution at a pH of about 4 to 8 with a ratio of copper to cyanide in the range of ... | 06/20/1989 |
| 4840975 | Spherical grains of polyamino acid and production method thereof The present invention provides novel spherical grains of polyamino acid wh can be used as a filler in chromatography, cosmetic powder and the like. The spherical grains can be produced by a method which comprises the steps of preparing a solution of hydr... | 06/20/1989 |
| 4840169 | Ventilation system for artists A ventilation system for use by artists when working with paints and solvents is disclosed. The system includes a palette assembly wherein a palette is mounted on the inside of a housing which is connected to a blower so as to create a negative air pressu... | 06/20/1989 |
| 4838591 | Electric door opener An electric door opener is described, which is housed in a narrow, longitudinally symmetrical T-shaped casing. Behind a swing catch is arranged a changer constructed as a swing arm, which is approximately parallel to the swing catch axis and whose free en... | 06/13/1989 |
| 4838677 | Eye exercising devices An eye exercising device is disclosed having a positioning product to position the eye along an optical axis, which defines a range of accommodation for the eye. The range of accommodation is bounded by a proximal and a distal limit. An object is movable ... | 06/13/1989 |
| 4838810 | Coupling engagement mechanism for electric connector A coupling engagement mechanism for an electric connector comprises engagement fixtures and an insulating housing element which includes engagement fixture receiving portions for accommodating the engagement fixtures. Each of the engagement fixtures is un... | 06/13/1989 |
