Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 6472851 | Hybrid tap-changing transformer with full range of control and high resolution A hybrid tap-changer for delivering AC power to a load in which a high-power tap-changing transformer with full range of adjustment but limited resolution is combined with a low-power electronic converter of limited range but high resolution to provide a ... | 10/29/2002 |
| 6262555 | Apparatus and method to generate braking torque in an AC drive A device and control method to produce braking torque counter to motor rotation. A converter supplies multiple frequency AC power to the motor. A first frequency is supplied at the normal operating frequency/speed. A second frequency, different from the n... | 07/17/2001 |
| 5893697 | Automated system for selecting packages from a storage area A package dispenser that can be used in an automated system for filling orders, such as prescriptions for patients. The dispenser includes a magazine for holding a plurality of packages. The magazine includes a loading end and a dispensing end which has a... | 04/13/1999 |
| 5820226 | Freight brake control for uniform car deceleration A railway freight brake system for operating vehicles in a train wherein each vehicle responds in braking situations to provide a generally uniform net braking ratio on all cars in the train. Embodiments include vehicles receiving a brake signal and utili... | 10/13/1998 |
| 5785392 | Selectable grade and uniform net shoe force braking for railway freight vehicle A railway freight brake method and apparatus for operating vehicles in a freight train having a locomotive and a number of railway freight vehicles wherein the individual railway freight vehicles can be controlled in a grade descending mode. When desired,... | 07/28/1998 |
| 5543596 | Highway crossing gate mechanism circuit contact A rotary switch operated by a cam having a lobe is disclosed. The cam is attached to a mechanism for rotation about the axis of the cam. A first switch contact member is positioned adjacent said cam and selectively makes electrical contact with a second s... | 08/06/1996 |
| 5535968 | Vital railway signal link A vital railway signal link for passing DC signals between a first terminal location and a second terminal location. A transmitter at the first terminal location receives a DC input signal and responsively produces a light signal modulated at a preselecte... | 07/16/1996 |
| 5501417 | Noise cancellation in railway cab signal A cab signaling apparatus for use on board a railway vehicle which is propelled on rail tracks by an electric drive motor. The invention utilizes a cab signal transmitted to the vehicle through a track circuit in the rails. On board receiving of the cab s... | 03/26/1996 |
| 5502367 | Highway crossing control Highway crossing gate control circuit in which a permanent magnet motor is controlled to drive up and drive down the gate arm by utilization of a single motor control relay and controller contacts which sense the position of the gate arm. The motor polari... | 03/26/1996 |
| 5459663 | Cab signal apparatus and method An apparatus and method for supplying cab signal to a rail vehicle on a section of track composed of sequentially adjacent railway track circuit blocks. Respective receivers of each track circuit block are monitored for the presence of a vehicle within th... | 10/17/1995 |
| 5398894 | Virtual block control system for railway vehicle A virtual block system is provided in which a section of track is represented by a zone having a plurality of virtual track circuits. Communication between wayside and the vehicle is established within the zone, and may be used to provide the initial posi... | 03/21/1995 |
| 5331288 | Railroad rail signal receiver having frequency conversion and a resonant tuned transformer secondary A receiver for use in receipt of signals on railroad rails which converts the rail signal to a higher frequency and feeds the higher frequency signal into an input transformer. The secondary of the input transformer is in a tuned circuit which is resonate... | 07/19/1994 |
| 5330134 | Railway cab signal An improved railway cab signal transmitter for transmitting a cab signal onto a pair of rails for reception by a railway vehicle on said rails. A tuning arrangement is connected across the rails to generally resonate with the leaving end impedance bond at... | 07/19/1994 |
| 5158728 | Multi-layer medicinal tablet forming machine and method for using the same An apparatus for forming a generally cylindrical two-layer, vertically-compressed tablet having a longitudinal axis longer than its diameter is provided in which a generally cylindrical die cavity is provided on a die table with the longitudinal axis of t... | 10/27/1992 |
| 5000637 | Fastening device with circumferential ribs and method for manufacturing the same A fastening device uses a ribbed rivet to secure two materials together. The ribs on the rivet should have a height no greater than 0.005 inches on most plastics and be of a close proximity. This rivet can be pushed directly into, or pulled directly out o... | 03/19/1991 |
| 4974656 | Shade and method for the manufacture thereof This invention relates to a pleated shade, and a method for the manufacture thereof. The shade has the two sections forming each rear projecting pleat secured together to form a rear projecting tab. Cord holes are formed in each of the tabs. The rigidity ... | 12/04/1990 |
| 4964576 | Method and apparatus for mineral matter separation A combination of raw coal and water is introduced as a slurry into a vessel. Chemicals are introduced at a feet inlet. The mixture is reduced by interaction with a bed of agitated grinding balls. Air is introduced into the lower portion of the vessel and ... | 10/23/1990 |
| 4949830 | Control apparatus for a motor, clutch and gear drive arrangement A control apparatus is provided which controls a motor, clutch and drive gear arrangement. The device consists of a movable control lever assembly which moves from a neutral position into at least one other operating position. The control apparatus includ... | 08/21/1990 |
| 4942067 | Wood preservative and method for preserving wood A method for preserving wood uses a pressurized solution of concentrated thujone oil. The concentrated thujone oil is applied to the wood to be preserved at a pressure in the range of 120 to 200 p.s.i. Preferably, the wood to be preserved is heated to abo... | 07/17/1990 |
| 4941105 | Method and apparatus for measuring dynamic bearing force A support member extending outwardly from the surface of a bearing overlies a rotatable shaft supported by the bearing. The support member is spaced a preselected distance from the shaft, and a plurality of sensors for detecting displacement of the shaft ... | 07/10/1990 |
| 4928507 | Methods and apparatus for manufacturing seamless tube Ingots hot from rolling are pierced to form a hollow ingot by means of an internal tool of a press or skew-rolling line, and are subsequently elongated to form a tubular bloom by a stretching unit provided with a mandrel rod, and are finally finish-rolled... | 05/29/1990 |
| 4929142 | Vehicle carrier with wheel lift A subframe structure for a tilting bed vehicle carrier. The subframe structure has an attached wheel lift and the subframe is pivotally mounted on the chassis of a towing vehicle. The subframe structure includes pivotally mounted strut members for load di... | 05/29/1990 |
| 4923083 | Straw for storage within beverage container A beverage container having a metallic lid with a bend down panel on the lid to define an opening for the lid. A rupturable score line separates the panel from the lid and facilitates detachment of the panel from the lid and bending of the panel downwardl... | 05/08/1990 |
| 4915004 | Body for an electronic stringed instrument A body for an electronic stringed instrument is disclosed in which an inner metal chassis is provided with a removable and replaceable outer body shell. The chassis has a first end adapted to receive and secure a neck of a guitar or similar instrument and... | 04/10/1990 |
| 4911414 | Sealing injection apparatus for injecting substances into molten metals An injection apparatus for use in injecting substances into molten metal contained in a vessel including a nozzle block having at least one initially closed injection passage and a lance movable in the passage and advanceable to open the passage for injec... | 03/27/1990 |
| 4903358 | Fire-resistant seating, in particular aircraft seats Fire-resistant seating, in particular aircraft seats, which consist of at least a soft, supporting material and a cover, between which there is a fire-resistant intermediate layer, which is a combustion of a layer of fiberglass fabric, which is firmly att... | 02/27/1990 |
| 4899814 | High pressure gas/liquid heat exchanger A heat exchanger for use with high pressure gases is disclosed which has a generally cylindrical shell through which pressurized gas is passed. A plurality of stacked, high pressure, fluid-carrying serial coils are arranged in parallel serpentine paths wi... | 02/13/1990 |
| 4898427 | Neutral stop device A neutral stop device is provided which prevents the accidental lowering of a truck bed when the spool of the hydraulic valve system is positioned in a neutral location and any force acts on a pull-out cable running from the spool to the truck bed. A stop... | 02/06/1990 |
| 4880119 | Cushioned container for hazardous material A container assembly for transporting hazardous or corrosive material wherein a bottle containing the material is cushioned against breakage and the container is protected against leakage. The assembly includes an outer metal container with a bottle dispo... | 11/14/1989 |
| 4879924 | Gearing for driving the rolls of a roll train The invention concerns a gear unit for driving the rolls of a roll train with a number of consecutively arranged roll stands. This gear unit has planetary gear sets at at least one output shaft, which are located one behind the other at short distances. D... | 11/14/1989 |
| 4879501 | Constant speed hydrostatic drive system A constant speed hydrostatic drive system is disclosed wherein a generator drive shaft is maintained at a constant speed by utilizing an electro-hydraulic controlled displacement pump responsive to a pressure transducer to control a hydraulic motor. A spe... | 11/07/1989 |
| 4843452 | Thyrister housing gate lead and method of manufacturing same A thyrister housing gate lead and a method for its manufacture effectively prevents the accumulation of entrapped solutions within the gate lead without causing other damage to the thyrister housing. A gate lead is closed at the interior end situated with... | 06/27/1989 |
| 4837549 | Tapped resistor grid assembly In the assembly two or more strips of resistance material are positioned edge-to-edge and fan-folded between the side members of a frame. The strips are supported at their loops by insulated fixtures and each has a terminal at each end. The strips are emb... | 06/06/1989 |
| 4835359 | Method of manufacturing hemispherical tank heads A method of manufacturing hemispherical tank heads is disclosed in which a pair of planar lune members having a generally football shape are cut from flat metal stock. The members are each then formed into a three dimensional lune section having a general... | 05/30/1989 |
| 4830536 | Method and apparatus for tunnel lining A method and apparatus for tunnel lining is provided made up of arcuate liner segments having a formed body with two end walls and two substantially parallel sidewalls, at least two pins extending from one sidewall intermediate its length in the median pl... | 05/16/1989 |
| 4826034 | Beverage container with automatic straw delivery mechanism and straw therefor A beverage container having a metallic lid with a bend down panel on the lid to define an opening for the lid. A rupturable score line separates the panel from the lid and facilitates detachment of the panel from the lid and bending of the panel downwardl... | 05/02/1989 |
| 4825777 | Pedestal liner A pedestal wear liner for trucks of diesel electric locomotives and other railway vehicles has a bight and a flange on each side. Each flange has openings in it corresponding to liner bolt holes in a pedestal leg but greater in area than those holes. Plug... | 05/02/1989 |
| 4826664 | Methods of desulfurizing gases A method for desulfurizing gases in which the sulfur is mainly in the form of hydrogen sulfide by reacting with one of the forms of cerium oxide with the formation of a cerium-oxygen-sulfur compound, which method can be conducted at temperatures as high a... | 05/02/1989 |
| 4822052 | Golf club grip attachment for identification and ball position marking A matched set of golf club identification markers for each golf club in the golfer's bag each include a disc-like body portion with a cylindrical anchor member formed on the bottom surface of the body member. An enlarged conical head formed on the bottom ... | 04/18/1989 |
| 4819237 | Method and apparatus for monitoring the validity of microprocess or volatile memory A microcomputer of a household appliance, such as a microwave oven, receives input data from the user for operating the various functions of the appliance. The data is stored in the volatile memory of the microcomputer. The data is compressed into a bit p... | 04/04/1989 |
