Patents by Inventor Friedrich J. Esper

Friedrich J. Esper has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4535487
    Abstract: The load P on an artificial hip joint produces a bending moment on the endoprosthesis shaft composed of a shaft proper (1), a collar (2) fitting the resection plane and a cone (3) for carrying the femur ball (14). The extra load B thereby provided on the medial side of the femur is relieved by providing means for resisting the tension force A of the bending moment by providing the shaft with cavities (11) separated by ribs (12) as well as by a median longitudinal rib (broken lines).The bone grows into the cavities thus securing the area against the tension effects. Additional cavities (9) and wedge-shaped nubs (7) and (5) similarly oppose forces A and/or B. Hollows (10) on the underside of the collar (2), as well as the cavities (11) and (9), also oppose twisting forces.
    Type: Grant
    Filed: January 13, 1984
    Date of Patent: August 20, 1985
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich J. Esper, Walter Gohl
  • Patent number: 4533392
    Abstract: High strength ductile sintered iron alloy composition containing silicon and phosphorus with a total alloy content below 4% having a yield point above 400 N/mm.sup.2 and an impact strength of more than 40 J/cm.sup.2. The alloys contain between about 0.5 and 3% by weight silicon, and between about 0.2 and 0.7% phosphorus, with the balance being iron. These alloy compositions are made by sintering iron, iron-silicon and iron-phosphorus powders at temperatures between about and C.
    Type: Grant
    Filed: February 16, 1978
    Date of Patent: August 6, 1985
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich J. Esper, Robert Zeller
  • Patent number: 4532492
    Abstract: To simplify manufacture and assembly of a temperature-compensated titanium dioxide oxygen sensor, the sensor (9, 9') is applied as a layer on the thermistor body (1), with an electrode (8) interposed; preferably, the thermistor body is densely sintered titanium dioxide, in the form of a closed tube (1, 1') which may have a central opening (FIG. 1: 2) therethrough, with the sensor body being porous titanium dioxide and located either on the inside (FIG. 1) surface of the thermistor body (1) or on the outside (FIG. 2) surface, and supported by the thermistor body, which forms the substrate and support surface for the sensor body.
    Type: Grant
    Filed: June 14, 1984
    Date of Patent: July 30, 1985
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich J. Esper, Hermann Fischer, Karl-Hermann Friese, Peter Scharner
  • Patent number: 4503348
    Abstract: An electromagnetic transducer which generates signals on the basis of the Barkhausen effect under periodically alternating externally applied magnetic switching fields. Prior to use, the magnetic sensor element, for example a ferromagnetic wire, is pre-magnetized by undergoing a program which subjects the wire to a coercive applied field substantially higher than the alternating interrogation field. The coercive field places different zones of the wire into magnetic saturation with varying relative polarity, thereby creating two or more zones of different magnetization. When subjected to the alternating, low intensity interrogation field, sensor coils detect a high level, bipolar output signal.
    Type: Grant
    Filed: November 27, 1979
    Date of Patent: March 5, 1985
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich J. Esper, Gottfried Meudt
  • Patent number: 4268468
    Abstract: A bone replacement, for example a portion of a hip joint, a bone junction plate, or the like, includes a core element of a fiber-reinforced thermosetting material with a surface element made of a biologically compatible material, typically polyethylene, completely surrounding the core element. The outside surface element is internally interlocked with the core element, by being molded in one heat treatment operation which simultaneously cures the thermosetting material while molding the outside biologically compatible surface element thereto and interlocking and integrating the two elements into one unitary structure. Preferably, the fiber reinforcement is formed as fibers, woven mats, felted mats, or the like, and the surface element may, likewise, include a reinforcement beneath the surface actually in contact with the human body.
    Type: Grant
    Filed: July 13, 1978
    Date of Patent: May 19, 1981
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich J. Esper, Hans-Martin Wiedenmann
  • Patent number: 4221650
    Abstract: Oxygen sensors having a fine-grained stabilized cubic zirconium dioxide electrolyte contact respective electrodes. The zirconium dioxide contains between 15% and 50% by volume of Al.sub.2 O.sub.3 in a crystalline state and has good mechanical and thermal properties. The oxygen sensor may have a composite zirconium dioxide solid electrolyte element. The invention also includes a wider range of related Al.sub.2 O.sub.3 - containing stabilized cubic zirconium dioxides containing between about 8% and 85% by volume Al.sub.2 O.sub.3. The invention further provides methods of manufacturing such Al.sub.2 O.sub.3 - containing zirconium dioxide and for manufacturing oxygen sensors.
    Type: Grant
    Filed: May 30, 1978
    Date of Patent: September 9, 1980
    Assignee: Robert Bosch GmbH
    Inventors: Karl-Hermann Friese, Friedrich J. Esper, Heinz Geier
  • Patent number: 4183798
    Abstract: Stabilized zirconium dioxide compositions sintered with a silicate flux and stabilized with (i) calcium oxide and (ii) magnesium oxide. The stabilized zirconium dioxide can be sintered at temperatures between C. and C. to form solids having high mechanical strength and a specific resistance of at a low temperature. The invention also provides oxygen sensors containing at least one measuring cell which is an oxygen concentration cell having two electrodes separated by and in ionic communication through a solid stabilized zirconium dioxide electrolyte which is prepared from the said compositions.
    Type: Grant
    Filed: March 20, 1978
    Date of Patent: January 15, 1980
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich J. Esper, Karl-Hermann Friese
  • Patent number: 4128420
    Abstract: To provide an alloy having high strength, toughness, and which is highly resistant to impact loading, the alloy has the following composition (all percentages by weight): 2-4.5 Mo, more than 2.5 to less than 3.5% Ni, more than 0.3 to less than 0.6% P, the rest iron; preferably, 3% Mo, 3% Ni, 0.45% P and the rest iron are used.
    Type: Grant
    Filed: March 17, 1977
    Date of Patent: December 5, 1978
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich J. Esper, Robert Zeller
  • Patent number: 3959002
    Abstract: A method for manufacturing white furnace boats which are used for firing ceramic articles at temperatures up to about C. The furnace boat is made from a mixture of between 45% and 55% of synthetic corundum having a particle size of between 1 and 2 mm, between 25% and 35% of synthetic corundum having a particle size of between 0.1 and 0.2 mm, between 5% and 20% of kaolin having a particle size of 99% under 0.06 mm and 0.1% over 0.06 mm, and between 5% and 10% of quartz having a particle size of between 0.1 and 2 mm. The product white furnace boats are .alpha.-Al.sub.2 O.sub.3 in the amount of 60% to 70%, mullite in the amount of 20% to 30%, and a glass phase together with some cristobalite in the amount of 5% to 10%.
    Type: Grant
    Filed: May 2, 1974
    Date of Patent: May 25, 1976
    Assignee: Robert Bosch G.m.b.H.
    Inventor: Friedrich J. Esper