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.
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| Number | Title | Issue Date |
| 6158507 | Well screen A well screen is disclosed for positioning in a well bore to screen solid particles from the fluid produced by the well comprising a base pipe having a perforated wall and threaded connections for connecting the base pipe into a pipe string, a wire screen... | 12/12/2000 |
| 6140587 | Twin axial electrical cable A high frequency shielded data transmission cable and method of making same are disclosed. Optimal transmission and minimal signal loss are achieved when the conductors of such a cable are maintained in fixed positions relative to one another and relative... | 10/31/2000 |
| 4315873 | Cooling equipment There is disclosed cooling equipment wherein air is caused to pass through a wet cooling tower section and thus precooled prior to passage across the tube bundle of a dry cooling tower section through which a medium to be cooled is circulated, and then ei... | 02/16/1982 |
| 4308677 | Ejector type scraper There is disclosed an ejector type scraper wherein an ejector having a generally vertical front face is moved between rearward and forward positions, during loading and unloading of the bucket of the scraper, by means of hydraulically operated, extendible... | 01/05/1982 |
| 4308927 | Well drilling tool There is disclosed a turbodrill having thrust bearings received within an annular space between its shaft and case to support the shaft for rotation within the case, and a face seal closing off the lower end of the space beneath seal rings forming a lubri... | 01/05/1982 |
| 4301861 | Steam condensing apparatus There is disclosed apparatus for use in condensing steam from the turbine exhaust of a power plant or the like, comprising a steam condenser having means for circulating cooling medium therethrough in order to condense a portion of the steam from the turb... | 11/24/1981 |
| 4296802 | Steam condensing apparatus There are disclosed four embodiments of apparatus for use in condensing steam from the turbine exhaust of a power plant or the like, each comprising a steam condenser having means for circulating cooling medium therethrough in heat exchange relation with ... | 10/27/1981 |
| 4284149 | Well drilling tool A well drilling tool is disclosed as having a reservoir for supplying lubricant to a bearing chamber to replace that which is lost during operation of the tool, and a means for indicating to an operator at surface level when a predetermined volume of such... | 08/18/1981 |
| 4260167 | Well drilling tool There is disclosed a well drilling tool having a body which is connectible as part of a drill string and which includes inner and outer members which are supported for rotation with respect to one another by bearing means contained within a lubricant cham... | 04/07/1981 |
| 4260032 | Well drilling tool There is disclosed a turbodrill having an axial thrust bearing section which is contained within a lubricant chamber arranged within an annular space between the case and shaft of the turbodrill above the turbine section, and which is defined between mean... | 04/07/1981 |
| 4260030 | Well tool There is disclosed a turbodrill wherein excessive wear on the axial thrust bearing supporting the shaft from the housing is detectable at the surface by means of an increase in the back pressure of the drilling fluid circulating through the turbine sectio... | 04/07/1981 |
| 4256189 | Well drilling tool A well drilling tool is disclosed as having an inner tubular member rotatably supported from an outer tubular member by means of bearings contained within an annular lubricant chamber between them. An annular chamber is formed in an inner tubular member t... | 03/17/1981 |
| 4251066 | Vise There is disclosed a vise for use in a vertical milling machine or the like wherein the inner sides of master jaws releasably attached to the inner sides of the locking jaws of the vise are provided with dovetail grooves in which dovetails on the outer si... | 02/17/1981 |
| 4248549 | Apparatus for anchoring a platform at an offshore location Apparatus is disclosed in which a flexible line having its lower end anchored to a base fixedly mounted at an offshore location extends through an upwardly flared opening in the base for connection to a tension leg platform on the surface of the ocean.... | 02/03/1981 |
| 4244486 | Tank A tank which comprises longitudinally extending bottom and side walls formed of a sheet of flexible, plastic material bent into a "U" shape and end walls formed of additional sheets of plastic material having side and bottom edges secured to the side and ... | 01/13/1981 |
| 4240216 | Land forming and/or farming apparatus Apparatus is disclosed wherein a plow is mounted on a frame so as to form a ditch in the ground as the frame is towed behind a tractor. The frame is of such construction and so attached to a three point hitch that its rear end cannot be lifted without fir... | 12/23/1980 |
| 4240609 | Flow control apparatus Flow control apparatus is disclosed in which a closure element is reciprocated between flow controlling positions by means of a stem which is substantially counterbalanced with respect to forces on the stem due to the pressure of the fluid being controlle... | 12/23/1980 |
| 4240502 | Condensing heat exchanger There is disclosed a heat exchanger having one or more bundles of tubes through which steam or other vapor is passed and comprising horizontally arranged rows of tubes each of which is connected to a separate outlet header. Condensate from the outlet head... | 12/23/1980 |
| 4235394 | Apparatus for guiding superimposed layers of line onto and off of a power driven reel There is disclosed a means mounted in front of a power driven reel for shifting laterally back and forth in a direction parallel to the axis of the reel in order to guide a line onto or off of the reel. A servo-mechanism is provided for causing the line t... | 11/25/1980 |
| 4235571 | Cooling equipment Cooling equipment is disclosed as having an axial flow fan whose blades are restrained from excessive bending in an axial direction.... | 11/25/1980 |
| 4229385 | Variable venturi carburetor A variable venturi carburetor is disclosed which has side walls that simultaneously are moved toward and away from one another to increase the size of the throat of the venturi as the engine speed increases and decrease the size of the throat as the engin... | 10/21/1980 |
| 4210103 | Fuel system for and a method of operating a spark-ignited internal combustion engine There is disclosed a spark-ignited internal combustion engine wherein a blend of gasoline and alcohol is separated into its gasoline and alcohol phases, with the gasoline being atomized within an induction system, and the alcohol being dissociated into va... | 07/01/1980 |
| 4202405 | Air cooled condenser There is disclosed an air cooled condenser comprising a tube bundle having rows of tubes arranged to be successively contacted by cooling air, an inlet header at one end of the bundle connected to the tubes of one of the outermost rows and the row adjacen... | 05/13/1980 |
| 4201242 | Pressure relief valve There is disclosed a pressure relief valve having a part which is movable to a first position for returning the closure member thereof to closed position, and thus resetting the valve, automatically in response to a predetermined low pressure level of flu... | 05/06/1980 |
| 4198181 | Apparatus for drilling holes in "H" beams There is disclosed an apparatus for drilling holes in the web and a flange of an H-beam on opposite sides of the web, which comprises a framework having a first, fixedly mounted section and a second section which is mounted on the first section for guided... | 04/15/1980 |
| 4194389 | Apparatus for pressure testing pipe External pipe testing apparatus is disclosed as comprising semi-cylindrical housing sections hingedly connected for swinging between an open position to permit the housing to be moved into and out of a position about a section of the pipe to be tested. Wh... | 03/25/1980 |
| 4189127 | Expanding gate valve There is disclosed a valve having an expanded gate comprising a pair of ported segments each having "V"-shaped, oppositely facing inner surfaces which are yieldably urged into conformity with one another by a pair of leaf springs. Each leaf spring is disp... | 02/19/1980 |
| 4183176 | System for supplying liquids to potted plants There is disclosed a system for supplying liquids to potted plants through feeder conduits fluidly connecting with the lower ends of the plants and leading from a main distribution conduit to which the liquid is admitted from a water main or other pressur... | 01/15/1980 |
| 4181342 | Self releasing sling hoist A self releasing sling hoist is disclosed that includes a body for connecting to a hoist line for lifting a load. A sling such as a flexible line or cable has one end attached to one side of the body. The other end is provided with a loop or opening for a... | 01/01/1980 |
| 4141605 | Bearing A bearing is disclosed that includes a support housing or casing in which is located a body of elastomeric material. A plurality of wear members are positioned to be supported by the body of elastomeric material and to receive the load placed on the beari... | 02/27/1979 |
| 4121675 | Apparatus for gripping a shaft or the like Apparatus is disclosed that includes a housing through which extends a shaft, such as a drill string. A body of wire mesh is carried by the housing and located between the housing and the drill string. The wire mesh is compressed to cause it to expand lat... | 10/24/1978 |
| 4121657 | Position indicator for downhole tool Apparatus is disclosed to indicate at the surface when a tool lowered into a well bore on an electric cable is properly positioned in a downhole housing. The tool has a key slot and a muleshoe is carried by the tool to engage a key located on the housing ... | 10/24/1978 |
| 4116451 | Shaft seal assembly and seal ring therefor A seal is disclosed for use in high ambient temperatures. The seal includes a plurality of V-shaped seal rings having opposite convex and concave sides that are stacked or rested in the annular space provided between a shaft and a housing through which th... | 09/26/1978 |
| 4102395 | Protected well screen The well screen assembly disclosed includes a perforated pipe joint having a well screen mounted internally of the pipe joint. The well screen includes a plurality of rods positioned parallel to and spaced from the longitudinal axis of the pipe joint with... | 07/25/1978 |
| 4099117 | Method and apparatus for measuring the quality of insulation on a buried pipeline and the quantity of metal oxide present at breaks in the insulation The invention disclosed comprises a method of and apparatus for inspecting a pipeline in situ. An alternating voltage is impressed between the pipeline and a ground bed. Spaced electrodes are positioned transverse the pipeline at spaced locations along th... | 07/04/1978 |
| 4059905 | Apparatus for locating access openings for electrical outlet boxes in covering members The apparatus disclosed includes a locator pin assembly for mounting on the outlet box before the covering member is placed over the box. It includes one or more pins, depending on the type of outlet box, that are attached to and extend perpendicularly fr... | 11/29/1977 |
| 4060177 | Stamp dispensing apparatus An elongated web of stamps comprising a plurality of stamps connected together by a backing strip or longitudinally spaced transverse rows of perforations and formed into a roll is used in the dispensing apparatus disclosed. The stamp web is moved from th... | 11/29/1977 |
| 4033414 | Method and apparatus for releasing a drill string held by differential pressure The invention disclosed includes a method of and apparatus for reducing the differential pressure holding a section of a drill string by lowering the hydrostatic pressure of the drilling fluid in the well bore adjacent the section being held. This is done... | 07/05/1977 |
| 4031631 | Apparatus for reducing the opacity of the emissions from wood dryers The apparatus disclosed comprises conduits connecting the outlets of a plurality of heating zones of wood dryers to a common stack through which the emissions from all of the zones are discharged to the atmosphere. The common stack and the conduits betwee... | 06/28/1977 |
| 4016942 | Method and apparatus for indicating the position of one well bore with respect to a second well bore A compression wave type signal of a selected frequency is transmitted into the ground at the bottom of a well bore being drilled. The signal is picked up by four microphones that are positioned in another well bore. The microphones have a known orientatio... | 04/12/1977 |
