Accessories Patents (Class 123/198R)
  • Patent number: 4312311
    Abstract: An engine idling correction system for an automotive vehicle provided with an air conditioner and an automatic transmission comprises a novel actuator having two vacuum compartments. A vacuum supplied from an intake vacuum outlet on an intake manifold of the engine is introduced into a first vacuum compartment in the actuator when a thermostat provided in the cooling unit is turned on, and into a second vacuum compartment in the same actuator when a neutral switch provided for the automatic transmission is turned on, whether independently or simultaneously, in order to open the throttle valve; that is, to correct the engine revolution speed under engine idling conditions. The actuator thus improved is also so designed as to be adaptable to engine idling correction systems for various automotive vehicles, with less costly structure and better interchangeability.
    Type: Grant
    Filed: May 2, 1980
    Date of Patent: January 26, 1982
    Assignee: Nissan Motor Company, Limited
    Inventor: Hiroyoshi Iwata
  • Patent number: 4300496
    Abstract: Firemen and other rescue workers customarily use various portable rescue equipment, such as, saws, or prying tools, and air evacuation or exhaust fans powered by internal combustion motors. As a lack of atmospheric air or a reduction to levels not supporting internal combustion affects the proper functioning of such motors, atmospheric air is excluded from the carburetors thereof by an air exclusion hood means attached thereto or associated therewith, and air from an air pack worn by the worker or other suitable remotely located source of compressed air is introduced thereinto through a line from such source to a demand type regulator valve as such fresh air is demanded or required by the motor. Thus, a supply of uncontaminated air from the air pack or remote source may be fed into the demand regulator valve and, thence, into the carburetor to fulfill the requirements of the motor and to insure the proper functioning thereof.
    Type: Grant
    Filed: December 19, 1980
    Date of Patent: November 17, 1981
    Inventor: Robert A. Price
  • Patent number: 4280330
    Abstract: An air conditioning system primarily intended to be installed in an automative vehicle for selectively heating or cooling the passenger compartment for comfort as might be desired by the occupants.The system is completely battery operated and may be programmed to cool or heat the compartment without the engine of the vehicle operating. In addition since the system contains its own battery electrical emergency power may be transferred to the vehicle starting system should condition necessitate such.
    Type: Grant
    Filed: July 23, 1979
    Date of Patent: July 28, 1981
    Assignee: Verdell Harris
    Inventors: Verdell Harris, Richard L. Miller
  • Patent number: 4280457
    Abstract: A system responsive to engine manifold pressure for monitoring engine operating efficiency and reducing engine load during periods of low operating efficiency is disclosed. The system includes a switch which actuates a first relay when manifold vacuum pressure drops below a threshold level. In this condition, the first relay activates a time delay relay in the control circuit of the air conditioning compressor to remove this load from the engine after a first interval and maintain it in the off condition for a second interval.
    Type: Grant
    Filed: April 13, 1979
    Date of Patent: July 28, 1981
    Inventor: Steven R. Bloxham
  • Patent number: 4273086
    Abstract: The subject invention constitutes an uncomplicated, inexpensive means of loosening "frozen" cylinders under certain conditions in an internal combustion engine, by applying pressure to the piston by forcing grease from a grease gun applied to a fitting in the engine spark plug or injector hole.
    Type: Grant
    Filed: June 12, 1979
    Date of Patent: June 16, 1981
    Inventor: Robert K. Hayden
  • Patent number: 4261311
    Abstract: The invention is an apparatus which is mountable to the two-barrel fuel mixture intake of an internal combustion engine, ordinarily eight cylinder, wherein the two intake barrels are covered with a special plenum which replaces the ordinary carburetor, this plenum having a central septum dividing it into two chambers, one of which communicates separately with each of the intake barrels, and each chamber mounting a separate carburetor with a separate fuel input, there being separately controlled valves in the fuel input lines of the two carburetors so that by cutting the fuel off to one carburetor, half of the cylinders become inoperative thus saving fuel. An opening is provided in the septum which is valved to open when it is desired to run all eight cylinders to insure pressure equalization in the intakes for all cylinders.
    Type: Grant
    Filed: June 29, 1979
    Date of Patent: April 14, 1981
    Inventor: Melvin E. Rupe
  • Patent number: 4259931
    Abstract: A valve selector rotary latch mechanism is provided having an improved locating clip (46, 47) for aligning a telescoping spring capsule subassembly (38, 40) relative to the position of a rotary acting blocker plate (41, 42) and a mounting bracket (36) which connects a solenoid actuator (31) through a linkage (43, 44) to the blocker plates. The locater clip is formed of a resilient spring steel and includes a folded-over horizontal portion (77, 78) which is connected by means of a flared eyelet (66) through the mounting bracket and a looped portion (88) which extends beyond the bracket with an end tap (90) thereof being in locking engagement with a notch (74, 76) formed in the side wall of the telescoping spring capsule subassembly. A locking tab (80) is formed on the end of the folded-over portion and extends into an opening in the bracket for preventing rotation of the clip as the valve selector is assembled to the engine cylinder head.
    Type: Grant
    Filed: July 17, 1979
    Date of Patent: April 7, 1981
    Assignee: Eaton Corporation
    Inventors: David P. Clark, John L. Eustis
  • Patent number: 4226090
    Abstract: A control system (14) for a vehicle air conditioner driven by an associated internal combustion engine of the vehicle is disclosed as including a control circuit (40) for selectively operating the air conditioner to provide cooling of the vehicle in a manner that conserves fuel without appreciably affecting passenger comfort. A sensor (62) of the control system is responsive to an increased power demand on the engine to automatically suspend operation of the air conditioner by the control circuit until the engine output is subsequently increased with respect to the power demand. The control circuit preferably provides electrical operation of the air conditioner compressor which is driven by the engine and the sensor (62) senses the intake manifold vacuum of the engine to automatically suspend compressor operation whenever the vacuum falls below a predetermined extent.
    Type: Grant
    Filed: August 6, 1979
    Date of Patent: October 7, 1980
    Inventor: James G. Horian
  • Patent number: 4215658
    Abstract: A kit for converting an automobile engine from a conventional water pump driven by mechanical engine power to electrical drive which is separately controllable independently of engine operation. The kit includes a conventional air conditioning blower motor, and a bracket which permits motion of the electric motor on the bracket, whereby the motor, belts, pulleys, etc. can be changed without having to remove the bracket from the water pump on the engine.
    Type: Grant
    Filed: June 9, 1977
    Date of Patent: August 5, 1980
    Assignee: W. R. Grace & Co.
    Inventors: Richard J. Smith, Jr., Ralph R. Bellino
  • Patent number: 4214568
    Abstract: A drive unit for driving both a distributor and a fuel pump, in which a driving gear which is in meshed engagement with a driven gear on a rotating shaft of a distributor is fixed on a drive shaft and formed integrally with a cam which engages an operating lever of a mechanical fuel pump, and a collar is force or press fitted on said cam.
    Type: Grant
    Filed: September 27, 1978
    Date of Patent: July 29, 1980
    Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha
    Inventors: Eiji Ito, Shigeki Okaguchi
  • Patent number: 4214457
    Abstract: A flexible coupling shaft which is suitable for plug-in installation between the splined output shaft of a turbine engine and the splined input shaft of a testing apparatus for the production test of the engine, includes a shaft member having opposed end flanges which are connected by: (1) bayonet connections to hub members, each having a splined central portion for receiving the splined shaft of either the engine or the testing device; and (2) flexible joint connections in the form of stacked arrays of flat metallic shims, with the stacked shims being separately connected respectively to the flange parts of the shaft and the associated hub. By this arrangement, axial misalignment between the splined input and output shafts is compensated by the splined interconnections, while lateral misalignments are compensated for by bending of the stacked shims which define a diaphragm-type coupling.
    Type: Grant
    Filed: April 18, 1979
    Date of Patent: July 29, 1980
    Assignee: Avco Corporation
    Inventors: James Wade, Charles S. Jewett
  • Patent number: 4213437
    Abstract: A device for overcoming the problem of restarting an internal engine while it is still hot, in which means are provided for blowing air into the air filter of the engine each time it is restarted in order to purge the filter of non-combustible gases trapped inside the filter which prevent the engine from starting immediately.
    Type: Grant
    Filed: November 20, 1978
    Date of Patent: July 22, 1980
    Inventor: Carmen Onofrio
  • Patent number: 4206613
    Abstract: An air conditioning control system for an automotive vehicle including a timer circuit connecting the ignition circuit to a compressor switch means, functioning to turn off the air conditioner compressor for a predetermined timing period after the ignition switch is turned on. The system also includes an inertial switch, such as a mercury switch, which is rendered conductive when the forward acceleration and/or grade of the vehicle attains a predetermined value. The conduction of the inertial switch immediately de-actuates the air conditioner compressor, and the air conditioner compressor remains inoperative as long as the inertial switch is conductive and for the predetermined timing period of the timer circuit after the inertial switch is rendered non-conductive.
    Type: Grant
    Filed: October 25, 1978
    Date of Patent: June 10, 1980
    Inventor: Norman E. Shockley
  • Patent number: 4198938
    Abstract: A vacuum actuated system comprises a carburetor induction passage having a plurality of vacuum ports, vacuum servo means, fluid network means connecting the plurality of vacuum ports to the vacuum servo means and control means for selectively opening and closing communication between at least one of the plurality of vacuum ports and the vacuum servo means.
    Type: Grant
    Filed: November 18, 1976
    Date of Patent: April 22, 1980
    Assignee: Nissan Motor Company, Limited
    Inventor: Masanori Harada
  • Patent number: 4191157
    Abstract: An adapter kit for converting a battery powered motorcycle ignition system to a magneto ignition system comprising a drive mechanism adapted to be mounted in the tachometer drive take-off port of a motorcycle for driving a magneto by the gear provided for driving the motorcycle tachometer.
    Type: Grant
    Filed: September 7, 1978
    Date of Patent: March 4, 1980
    Inventor: David L. Shaw
  • Patent number: 4168694
    Abstract: A carburetor kit for placing over the top of a vehicle's carburetor when the vehicle's air filter assembly has been removed. The kit is used to prevent liquid from entering into the carburetor when the vehicle's engine is cleaned using a high pressure spray.
    Type: Grant
    Filed: February 6, 1978
    Date of Patent: September 25, 1979
    Inventor: James A. Nett
  • Patent number: 4161979
    Abstract: A two-cycle method for flushing an automobile cooling system and apparatus associated therewith. The method comprises cutting a hose between a water pump and a heater of a standard automobile cooling system. A pressurized air and water mixture is then introduced into the heater end of the cut hose, and after circulating through the cooling system, it exits through an opening in the top of a radiator which is normally sealed by a radiator cap. When this exiting water becomes clear, the second cycle is begun. The air and water mixture is introduced into the radiator opening and it circulates through the system in the opposite direction eventually exiting from the heater end of the cut hose. The apparatus of this invention includes a flow-through radiator cap which replaces the standard radiator cap, a plug which seals the water pump end of the cut hose and an "X" connector which by means of a pair of diverter valves directs the flow of the air and water into either the cut hose or the radiator opening.
    Type: Grant
    Filed: April 25, 1977
    Date of Patent: July 24, 1979
    Inventor: Earl J. Stearns
  • Patent number: 4158346
    Abstract: A pair of closely adjacent electrically conductive coils, suitably encapsulated, are secured to or retained closely adjacent the positive terminal of a battery of an internal combustion engine. An electrical wire extends from the coils and is electrically connected to the negative terminal of the battery.
    Type: Grant
    Filed: January 9, 1978
    Date of Patent: June 19, 1979
    Assignee: Mectronic, Inc.
    Inventors: Charles G. Roberts, Ernest DeMichele
  • Patent number: 4155225
    Abstract: In abstract, a preferred embodiment of this invention is a control means for vehicular type air conditioning systems wherein when a vehicle reaches a certain incline a preset switch will open thereby shutting off the air conditioning system of the vehicle until a more level inclination is reached. Additionally, a manual bypass is provided as is a level adjustment for the switch.
    Type: Grant
    Filed: September 23, 1977
    Date of Patent: May 22, 1979
    Inventor: Thomas B. Upchurch, Jr.
  • Patent number: 4142421
    Abstract: A transmission arrangement for a vehicle includes a housing assembly mounted on the rear end of the vehicle, a tubular transmission input shaft supported substantially within the housing assembly, an engine driven shaft extending through the transmission input shaft, and an input clutch assembly connected between the engine driven shaft and the transmission input shaft for selectively coupling them together, the input clutch assembly being adjacent and accessible through a rear cover of the housing assembly.
    Type: Grant
    Filed: September 6, 1977
    Date of Patent: March 6, 1979
    Assignee: Caterpillar Tractor Co.
    Inventors: W. Gene Stevens, Raymond P. Cobb
  • Patent number: 4131101
    Abstract: An enclosure spanning circuit for carrying fluids through opposed nonparallel walls of an enclosure used in a preferred embodiment to drain the open valley cover and manifold member of a V-type automotive diesel engine through a drain tube extending through walls of the valley cover and engine block and the crankcase enclosure and having sealing means at the associated wall openings to prevent leakage of the drained fluids into or crankcase vapors out of the engine crankcase.
    Type: Grant
    Filed: September 2, 1977
    Date of Patent: December 26, 1978
    Assignee: General Motors Corporation
    Inventor: Robert E. DeVinney
  • Patent number: 4130098
    Abstract: A portion of the exhaust gas of an internal combustion engine is returned to the induction manifold through an exhaust gas recycling line. This recycle line contains one or more orifice plates to create a measurable pressure drop when gas is flowing. The gas flow through the recycle line may be interrupted in controlled manner by a valve, particularly a magnetically actuated valve. The pressure drop across the orifice plate or plates is sensed by pressure-responsive electrical switches which provide input signals for a logical circuit that energizes a signaling device to warn the operator of a malfunction in the exhaust gas recycling system.
    Type: Grant
    Filed: August 3, 1977
    Date of Patent: December 19, 1978
    Assignee: Robert Bosch GmbH
    Inventors: Ernst Linder, Gunter Wossner, Helmut Maurer, Franz Rieger
  • Patent number: 4106977
    Abstract: A process for the production of oil control rings having a scraper edge formed by a layer consisting of a wear-resistant material. The wear-resistant layer is embedded between two softer layers. Thereafter, the scraper edge is machined and the soft layers recessed by etching to expose the scraper edges.
    Type: Grant
    Filed: April 26, 1976
    Date of Patent: August 15, 1978
    Assignee: Audi Nsu Auto Union Aktiengesellschaft
    Inventor: Heck Klaus
  • Patent number: 4095922
    Abstract: A pump such as a vehicle air conditioner compressor has a compressor shaft, a continuously engine-driven flywheel and means such as an electromagnetic clutch for selectively coupling the flywheel to the shaft to operate the pump. The flywheel also provides a permanent magnet field which field rotates with the flywheel and induces in the windings of a relatively stationary annular stator assembly an electric voltage in response to the rotating magnetic field. The pump shaft, annular clutch actuating coil, annular stator assembly, and permanent magnet flywheel are all generally concentrically disposed and in the order stated. The flywheel is driven any time that the engine is running thereby inducing a voltage in the stator windings and that flywheel also drives the exemplary compressor when the clutch is actuated.
    Type: Grant
    Filed: October 20, 1976
    Date of Patent: June 20, 1978
    Assignee: Tecumseh Products Company
    Inventor: James B. Farr
  • Patent number: 4090466
    Abstract: Gas "Eggconomizer" is a visual display device which indicates the rate of fuel consumption in an internal combustion engine. The device is loaded on the dash of an automobile and is connected by a tube to the intake manifold of the engine. The device includes an egg-shaped transparent container, an egg-shaped core with an elastic coating within the container, a support at the bottom of the container and a tube connected near the top of the container. When the device is subjected to the intake manifold vacuum, the upper half of the elastic coating reacts by varying in size to reflect the magnitude of the vacuum. High vacuum, which indicates minimal gas consumption, increases the size; while low vacuum, which indicates increased gas consumption, decreases the size. The device can be used to improve gas conservation driving habits.
    Type: Grant
    Filed: April 18, 1977
    Date of Patent: May 23, 1978
    Inventor: Stephen Jubinski
  • Patent number: 4074670
    Abstract: A pair of closely adjacent electrically conductive coils, suitably encapsulated, are secured to or retained closely adjacent an electrical accessory and a fuel line of an internal combustion engine. When the engine is utilized to drive a rubber-tired motor vehicle a ground strap is provided to provide an electrical connection around the insulation produced by the rubber tires and the rubber motor mounts of the engine.
    Type: Grant
    Filed: August 14, 1975
    Date of Patent: February 21, 1978
    Assignee: Mectronic Inc.
    Inventors: Charles Roberts, Ernest DeMichele
  • Patent number: 4068647
    Abstract: A portable, light weight device that includes an electrical conducting grid or screen that may be grasped by a thumb and fore finger and deformed to partially or wholly encircle a spark plug wire and terminal associated therewith. The electrical conducting screen or grid has a pliable electrical conductor connected thereto, which conductor on the free end is provided with a clip to removably secure the clip to a ground portion of a vehicle. When the screen or grid is in engagement with a spark plug wire and terminal, the high tension wire may be removed from a spark plug by a bare hand of a user of the invention without receiving an electric shock.
    Type: Grant
    Filed: September 4, 1975
    Date of Patent: January 17, 1978
    Inventor: Jerome R. Leddy
  • Patent number: 4016853
    Abstract: An internal combustion engine control system having a source of vacuum and a vacuum operated control device. A vacuum operated temperature controlled valve construction is provided for interconnecting the source to the device when the construction senses a certain temperature, the construction having means for only disconnecting the source from the device when the value of the source falls below a certain level thereof regardless of the temperature being sensed. The valve construction has a temperature operated pilot valve arrangement for actuating the valve construction to an open condition thereof when the certain temperature is sensed, the pilot valve arrangement including a snap acting bimetal disc for opening and closing a pilot valve seat thereof.
    Type: Grant
    Filed: March 31, 1976
    Date of Patent: April 12, 1977
    Assignee: Robertshaw Controls Company
    Inventor: Harley V. Bible
  • Patent number: 4006724
    Abstract: An electronic engine control system for an internal combustion engine has at least a portion of its circuitry mounted on circuit boards which are disposed generally in the path of induction air drawn into the engine via the engine air filter housing. The circuit boards are mounted within a molded plastic circuit board mounting housing which is disposed over openings in the sidewall of the sheet metal air filter housing and which is removably mounted thereon by means of attaching screws. An inlet snorkel via which induction air is drawn into the air filter housing is a molded plastic element secured to the circuit board mounting housing with the circuit board mounting housing being disposed between the snorkel and the air filter housing.
    Type: Grant
    Filed: March 18, 1976
    Date of Patent: February 8, 1977
    Assignee: Chrysler Corporation
    Inventor: Ivor W. Carter
  • Patent number: 3996913
    Abstract: An internal combustion engine of the type having so-called free standing cylinders or cylinder liners surrounded by an open topped coolant cavity is provided with internal sound attenuation barrier means, preferably mounted in the coolant cavity on the inner surfaces of the cylinder block walls or on the outer walls of the cylinders. The barrier means preferably comprises a rigid sheet engagable with the mounting wall and supporting a resilient sound absorbent material bonded or otherwise retained on one surface thereof. In a preferred embodiment the barrier material is a laminated steel having two spaced steel sheets bonded together by a rubber or rubber-like material encapsulated between the two sheets and formable into the desired shape of sound attentuating sleeve or barrier.
    Type: Grant
    Filed: September 29, 1975
    Date of Patent: December 14, 1976
    Assignee: General Motors Corporation
    Inventor: Nshan Hamparian
  • Patent number: 3996914
    Abstract: A housing containing a pair of electronic circuit boards removably mounts on the side of an engine air filter housing. The circuit board housing has a generally concave inner face matching the convex contour of the air filter housing side wall and is disposed over air circulation openings in the air filter housing side wall. In a first embodiment, the circuit board housing is of one-piece construction and the electronic circuit boards are disposed interiorly of the outer wall of the circuit board housing and in generally parallel relationship therewith. In a second embodiment, the circuit board housing is of two-piece construction having upper and lower halves. In this embodiment, the circuit boards are horizontally disposed, one each in each of the two housing halves. Connectors for effecting connection of the circuit boards with the other components of the system which are located exteriorly of the air cleaner housing extend through holes in the circuit board housing.
    Type: Grant
    Filed: March 18, 1976
    Date of Patent: December 14, 1976
    Assignee: Chrysler Corporation
    Inventors: Frederick William Crall, Lawrence William Tomczak
  • Patent number: 3983533
    Abstract: A circuit for providing an indication to the operator of a motor vehicle that the engine or vehicle is operating under conditions likely to produce poor fuel economy. The fuel economy indicating circuit includes a first circuit for generating a first electrical signal having a magnitude proportional to the angular velocity of a component of the vehicle drive train, and a second circuit for generating a second electrical signal having a magnitude proportional to the angular acceleration of a component of the vehicle drive train. A third circuit combines the first and second electrical signals to generate a third signal having a magnitude that is a function of the magnitudes of the first and second electrical signals. An electrically actuable indicating device is controlled by a fourth circuit that is responsive to the magnitude of the third electrical signal to cause actuation of the indicating device when the third electrical signal reaches a predetermined threshold level.
    Type: Grant
    Filed: June 19, 1975
    Date of Patent: September 28, 1976
    Assignee: Ford Motor Company
    Inventors: Kurt A. Goszyk, Richard A. Schaefer
  • Patent number: 3973549
    Abstract: A lipped cylindrical container having a pouring spout integrally formed therewith, which container is removably supported in a desired vertically spaced relationship on the lowest external surface portion of an automotive crankcase, to receive oil that drips therefrom. The container is removably supported from the crankcase by a number of elongate permanent magnets that are vertically adjustable relative to the container. Due to the vertical adjustment of the magnet, the container may be removably supported from the lower surface portion of a crankcase, irrespective of whether this portion is of a flat or curved configuration.
    Type: Grant
    Filed: October 23, 1975
    Date of Patent: August 10, 1976
    Inventor: Ronald B. Drummond
  • Patent number: 3973536
    Abstract: A device for feeding fuel to a diesel engine including a fuel storage tank, a feed pump provided in a conduit between the fuel storage tank and the engine, and an injection pump for atomization. The injection pump is provided with a pressure control valve for reducing the excessive pressure to that of the pressure prevailing in the conduits and with a device for measuring the fuel consumption. Means are provided for substantially equalizing the temperature of the fuel in a return conduit and in the feed conduit, and for holding the fuel under excessive pressure in the feed conduit.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: August 10, 1976
    Assignee: Van Doorne's Bedrijfswagenfabriek Daf B.V.
    Inventor: Wim Zelders
  • Patent number: 3960133
    Abstract: Apparatus is disclosed which is useful for conserving fuel and which comprises a means for preventing or controlling the opening of a valve, commonly called a butterfly valve, of a carburetor, beyond a pre-selected point whereby the flow of fuel into the intake manifold is controlled. Disclosed more particularly is an improved gasket for insertion between the carburetor and intake manifold of a vehicle.
    Type: Grant
    Filed: March 1, 1974
    Date of Patent: June 1, 1976
    Assignee: Barry J. Nace
    Inventor: James W. Donovan
  • Patent number: 3951123
    Abstract: In a bus or other vehicle propelled by an internal combustion engine, a plurality of engine accessories are mounted on bosses provided on both sides of an upright, triangular, transversely mounted accessory drive casing which is resiliently mounted on the vehicle frame at one side of the engine.Three parallel accessory drive shafts are journaled, one within each apex of the casing, one of which, the power input shaft, is driven from the engine. The other two shafts are driven from the power input shaft. Both ends of each shaft project from the casing and the accessories are mounted on the casing in driven relation with such shaft end portions.
    Type: Grant
    Filed: November 27, 1974
    Date of Patent: April 20, 1976
    Assignee: Rohr Industries, Inc.
    Inventor: Charles C. Hill
  • Patent number: 3937202
    Abstract: An internal combustion engine operating aid which produces a signal to the engine operator when the engine throttle is depressed or released so rapidly as to reduce engine operating economy. Such a signal is produced responsive to the actuation of a diaphram or piston contained within a chamber. Each side of the diaphram or piston is connected to the engine inlet manifold, however the connecting path to one side contains a restriction orifice. Thus the pressure on the side of the diaphram or piston having no restriction orfice changes immediately upon a change of pressure in the inlet manifold, such an inlet manifold pressure change being characteristic of uneconomical rapid acceleration or deceleration, while the pressure on that side having a restriction orifice in the connective path between it and the inlet manifold changes more slowly due to the restriction, this pressure differential producing movement of the diaphram or piston and a signal to the engine operator responsive to such movement.
    Type: Grant
    Filed: January 21, 1974
    Date of Patent: February 10, 1976
    Assignee: Mobil Oil Corporation
    Inventor: Donald P. Heath