Patents by Inventor Friedrich Esper

Friedrich 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: 5194099
    Abstract: A sinter magnet based on Fe-Nd-B with improved coercive field strength and reduced temperature dependency thereof consists of 25 to 50 wt. % Nd, 0.5 to 2 wt. % B, 0 to 5 wt. % Al, 0.5 to 3 wt. % O, remainder Fe and usual impurities and has an oxygen content which is adjusted by the addition of oxygen or of oxygen-containing compounds, especially of an Al and/or Nd oxide, before the dense sintering. It is obtainable by the melting together of the pure components with formation of a pre-alloy, pulverisation of the pre-alloy, alignment of the powder in a magnetic field and pressing to a green formed body, sintering at to C. and subsequent annealing at to C., whereby one adds the oxygen as Al or Nd oxide or via the grinding and/or sintering atmosphere.
    Type: Grant
    Filed: May 23, 1990
    Date of Patent: March 16, 1993
    Assignees: 501 Max-Planck-Gesellschaft zur Forderung der Wissenschaften E.V., 502 Robert Bosch GmbH
    Inventors: Friedrich Esper, Waldemar Draxler, Gunter Petzow, Andreas Buchel, Klaus-Dieter Durst, Ernst-Theo Henig, Gerhard Schneider, Helmut Kronmuller
  • Patent number: 4618351
    Abstract: A device for cleaning of gases of electrically conductive particles, like soot and the like, in particular for cleaning of exhaust gases of fossil fuels, like exhaust gases of Diesel motors and the like, with a coagulator admitted by the gases is suggested, whereby for preventing the formation of a short circuit bridge between electrode and housing of coagulator caused by deposition of agglomerates the insulator which provides for an insulated conduct of electrode through housing is provided with a ring segment at the location where the electrode exits into the inside of the housing extending in axial direction from the insulator, whereby at least one preferable ring like annealing zone is provided thereon. Due to the prevailing temperature of about C. at annealing zone all depositing agglomerates are burned off.
    Type: Grant
    Filed: August 10, 1984
    Date of Patent: October 21, 1986
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich Esper, Thomas Frey
  • Patent number: 4539503
    Abstract: In order to obviate the necessity for design compromise of spark plugs with respect to their operating temperature, so that the ceramic insulator (18) of the spark plug will rapidly reach the temperature at which deposits thereon will inherently burn off (about C.) while not becoming so hot as to cause spurious glow ignition within the combustion chamber of an internal combustion (IC) engine, the end portion of the insulator is formed with a central opening (19/3) within which a metal core (24) is included which has a temperature coefficient of expansion such that, at temperatures below between C. it is spaced by a narrow gap (25) from the inner surface of the insulator (see FIG. 1) but, as the spark plug becomes hot, the gap 25 closes (FIG. 2), thereby providing good heat transmission from the insulator to the center electrode structure (21, 23, 24) and thereby maintaining the insulator at a temperature below that at which it might glow.
    Type: Grant
    Filed: October 21, 1982
    Date of Patent: September 3, 1985
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich Esper, Karl-Hermann Friese, Walter Gohl, Peter Sternad
  • Patent number: 4418661
    Abstract: To decrease the preheat time and power requirements in preheater-type glow plugs for Diesel engines, a closed ceramic tube (20), for example of aluminum oxide and of about 5 mm diameter has, on the bottom (21) thereof applied a layer or film-like heater element (24, 24'), for example in an undulating or zig-zag configuration (FIG. 2) or in form of a constriction or pinch (FIG. 4: 24') to provide a concentrated point or strip source of heat. The heater layer itself is protected by a protective coating (25) and, to provide for the required heat distribution, the underlying bottom (21, 21') of the tube (20, 20') supports an insulating intermediate layer and possibly a heat conductive layer is intermediate. Preheat times in the order of 1-2 seconds, with lower current consumption than prior wound-wire plugs can be obtained.
    Type: Grant
    Filed: May 27, 1981
    Date of Patent: December 6, 1983
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich Esper, Thomas Frey, Heinz Geier, Gerhard Holfelder, Gunther Knoll
  • Patent number: 4356571
    Abstract: A medical prostheses suitable for implant use comprising a cured fiber reinforced triazine resin shaped body. The fiber reinforcement is preferably a fabric formed from two dimensionally oriented fibers. The preferred fibers are high strength carbon fibers. The prosthesis is particularly useful for the fabrication of joints, for example hip joints, as well as for support and connecting elements suitable for implantation.
    Type: Grant
    Filed: October 10, 1980
    Date of Patent: November 2, 1982
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich Esper, Walter Gohl
  • Patent number: 4339320
    Abstract: To permit efficient heat transfer from a carrier tube (22) surrounding a tubular solid electrolyte body (11') having outer and inner electrodes (14, 18) applied thereto, the tubular heater element carrier body (22) supports a wire or resistance track heating element (25) at the inner surface thereof, the heater element (25) being spaced from the outer surface of the solid electrolyte tube (11') forming part of the sensor element (11) by a distance at the most of 1 mm, preferably less than 0.5 mm, the wall thickness of the heater element carrier tube (22) preferably being between 0.3 and 0.8 mm thick, the carrier tube being made of ceramic, such as aluminum oxide, or internally insulated metal.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: July 13, 1982
    Assignee: Robert Bosch GmbH
    Inventors: Karl-Hermann Friese, Friedrich Esper
  • Patent number: 4334974
    Abstract: To permit a layer construction, which is inexpensive and lends itself to mass production manufacture, a solid electrolyte body, in plate-like construction, with electrodes at either thereof is positioned in a housing with a portion thereof extending in the region where it is exposed to gases to be sensed; a porous cover is applied on one of the electrodes, the porous cover having a predetermined diffusion resistance to oxygen molecules. A flat insulating plate of approximately the same dimension as the solid electrolyte plate is positioned flat thereagainst, and a flat layer-like electrical heating element is secured on the flat insulating plate or, in other embodiments, against another insulating covering on the other side of the heating element as well, close to the electrodes and adjacent the plane surfaces of the body.
    Type: Grant
    Filed: February 14, 1980
    Date of Patent: June 15, 1982
    Assignee: Robert Bosch GmbH
    Inventors: Klaus Muller, Helmut Maurer, Ernst Linder, Franz Rieger, Karl H. Friese, Harald Reber, Hermann Dietz, Hermann Ziener, Friedrich Esper, Gerhard Holfelder
  • Patent number: 4320080
    Abstract: To permit use of less expensive iron powder material and manufacture of more complex shapes, a mixture of iron powder, of an approximate grain size of between 30 to 450 .mu.m, and containing preferably 5 to 50% of carbonyl iron powder or from 5 to 50%, by weight, of soft ferrite powder of a grain size of from 10 to 200 .mu.m, and a thermosetting resin, in which the thermosetting resin is about 50% by volume of the overall mixture, is filled into a die. Pressure is built up in the die, which is heated, permitting excess binder to escape during the build-up phase thereof, the pressure then being held so that the resin can set in the heated die. The pressures needed are substantially less than heretofore required, in the order of from between 500 to 5000 bar.
    Type: Grant
    Filed: October 3, 1980
    Date of Patent: March 16, 1982
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich Esper, Hans-Martin Wiedenmann
  • Patent number: 4019914
    Abstract: A method of manufacturing .alpha.-alumina with a degree of purity of at least 98% which has a high sintering activity. The .alpha.-alumina contains at least 98% .alpha.-Al.sub.2 O.sub.3 and not more than 0.1% Na (calculated as Na.sub.2 O), and not more than 0.1% Ti (calculated as TiO.sub.2). The .alpha.-alumina also contains between 0.03% and 2% of Fe.sub.2 O.sub.3 and/or Cr.sub.2 O.sub.3. The .alpha.-alumina is formed by first fine grinding and then calcining, preferably at a temperature between about C and C, an aluminum hydroxide and/or hydrated aluminum oxide. The .alpha.-alumina is then cooled and finely ground to provide an .alpha.-alumina having excellent sintering activity.
    Type: Grant
    Filed: June 24, 1974
    Date of Patent: April 26, 1977
    Assignee: Robert Bosch G.m.b.H.
    Inventors: Friedrich Esper, Karin Bethge