Patents by Inventor Werner Tischer
Werner Tischer 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).
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Patent number: 5824741Abstract: This invention relates to impact-resistant thermoplastic moulding compositions based on a graft rubber, a thermoplastic resin and a small quantity of a free acid-functional nitrile rubber.Type: GrantFiled: May 15, 1997Date of Patent: October 20, 1998Assignee: Bayer AGInventors: Burkhard Kohler, Werner Tischer, Rolf-Volker Meyer
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Patent number: 5747586Abstract: The invention relates to thermoplastic molding compounds containing polyisobutylene-modified polycarbonate, graft polymer and optionally copolymer, aromatic polycarbonate, polyolefins.Type: GrantFiled: October 23, 1996Date of Patent: May 5, 1998Assignee: Bayer AGInventors: Burkhard Kohler, Werner Tischer, Wolfgang Ebert, Richard Weider, Thomas Scholl, Rolf Dhein
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Patent number: 5698622Abstract: The invention relates to mixtures of ABS graft polymers, sterically hindered phenols and dithiodipropionic acid.Type: GrantFiled: March 5, 1997Date of Patent: December 16, 1997Assignee: Bayer AGInventors: Burkhard Kohler, Werner Tischer
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Patent number: 5635560Abstract: The invention relates to mixtures of polycarbonate, phenolically hydroxyfunctional branched dimeric fatty acid polyesters and optionally graft polymer, which are distinguished by a good low-temperature strength and stress cracking resistance and good mould release properties.Type: GrantFiled: July 20, 1995Date of Patent: June 3, 1997Assignee: Bayer AGInventors: Burkhard Kohler, Dieter Wittmann, Wolfgang Ebert, Horst Beicher, Werner Tischer, Klaus Horn
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Patent number: 5599862Abstract: The invention relates to a mixture of(A) ABS graft polymer and(B) 0.05 to 2% by weight (based on the mixture) of a polyether- or polyester-grafted siliconewith improved surface gloss.Type: GrantFiled: May 30, 1995Date of Patent: February 4, 1997Inventors: Burkhard Kohler, Werner Tischer, Karl-Erwin Piejko
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Patent number: 5427623Abstract: A cleaning preparation for machines for processing plastics, consisting of or containing a powder-form acrylonitrile/butadiene/styrene polymer containing 20 to 80% by weight water which has been obtained from a latex by precipitation with magnesium sulfate or sodium phosphate and a process for cleaning processing machines for plastics in which the cleaning preparation is fed into the processing machine.Type: GrantFiled: June 18, 1993Date of Patent: June 27, 1995Assignee: Bayer AGInventors: Werner Schumann, Werner Tischer, Werner Brennig
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Patent number: 5086863Abstract: An all-wheel steering system for motor vehicles includes an adjusting motor (10) for the rear wheels. The motor has a piston rod on which two fixed working pistons (25 and 25A) and, in a housing segment located between the working pistons, two movable steering pistons (27 and 27A) are mounted. The working pistons (25 and 25A) and steering pistons (27 and 27A) form control chambers (28 and 28A) that are constantly connected to a pump (2). Between the steering pistons (27 and 27A) is a pressure chamber (33) in which a spring element (34) acts upon the steering pistons (27 and 27A). The pressure chamber (33) can be blocked via a 2/2-way valve (37) that is controlled by a switching device (17) or it can be connected with a tank (3). When the rear-wheel steering system (11) is in the operating position, the two steering pistons (27 and 27A) come to rest against a sleeve (35) on the piston rod by virtue of the pump pressure that is fed into the control chambers (28 and 28A).Type: GrantFiled: November 2, 1990Date of Patent: February 11, 1992Assignee: Zahnradfabrik Friedrichshafen, AG.Inventor: Werner Tischer
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Patent number: 5072802Abstract: A control mechanism for two consumers includes a flow divider valve (3) which is connected to a pump 2. From flow divider valve (3) springs a flow line (12) for the working flow (A) of a first adjustment device (10) such as a steering motor. Another flow line (13) of the flow divider valve (3) leads via an activation valve (14) to a second adjustment device (15). A pilot flow line (4) connected with the flow divider valve (3) via a measurement diaphragm (3A), is connected with a pilot valve (5). Pilot valve (5) can choke or entirely block the connection from the pilot flow line (4) to a nonreturn line (11) for the purpose of setting a pressure in flow line (12). For purposes of activation, pilot valve (5) is coupled with a steering valve (6) that controls flow line (12) so that both valves can be deflected together during one steering movement. A hydraulic steering unit is provided as the steering mechanism and it includes a rod-set connection from a manual steering wheel to the vehicle wheels.Type: GrantFiled: April 18, 1990Date of Patent: December 17, 1991Assignee: Zahnradfabrik Friedrichshafen, AGInventor: Werner Tischer
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Patent number: 5056311Abstract: A hydrostatic steering device is provided with a pump connected with a reservoir, a steering valve, a controlled-volume pump that is capable of being activated by a steering wheel and with a steering cylinder. The steering mechanism has a variable working flow and a constant pilot flow, with the pilot stream flowing through a constant throttle and the pressure drop through the constant throttle serving as a control signal for the conveying flow in a pressure delivery line. The controlled-volume pump is coupled mechanically with an adjustment throttle through which the pilot flows. Between the constant throttle and the adjustment throttle lies a pressure compensator that is controlled by the adjustment throttle's differential pressure. To receive the load signal, a control line branches off between the constant throttle and the pressure compensator and leads to the pump or, in the case of a fixed displacement pump with a rear-position flow-dividing valve, to the flow-dividing valve.Type: GrantFiled: November 27, 1989Date of Patent: October 15, 1991Assignee: Zahnradfabrik Friedrichschafen, AG.Inventor: Werner Tischer
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Patent number: 5017422Abstract: The invention relates to monofilms of ABS plastics or blends thereof with other thermoplasts having a film thickness of from 1 to 200 .mu.m which are self-supporting and transparent and are capable of being colored and electroplated and to a process for their production.Type: GrantFiled: June 3, 1988Date of Patent: May 21, 1991Assignee: Bayer AktiengesellschaftInventors: Werner Schumann, Werner Tischer
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Patent number: 4895891Abstract: Elastic-thermoplastic moulding compounds containing at least one graft polymer of resin forming monomers on a rubber and optionally other thermoplastic resins containing from 0.1 to 5% by weight, based on the moulding compound, of a hydrophobicised silica and the use of these moulding compounds for the production of sheets and coatings with a uniformly mat surface.Type: GrantFiled: June 6, 1988Date of Patent: January 23, 1990Assignee: Bayer AktiengesellschaftInventors: Werner Schumann, Werner Tischer, Wolfgang Liedtke, Klaus Richter
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Patent number: 4791016Abstract: A polycarbonate film obtained by dispersing carbon black in a solution of thermoplastic aromatic polycarbonate, producing a cast film, and subsequently stretching the cast film, is characterized in that its elongation at break is greater than that of a corresponding unstretched similarly filled film having an identical thickness.Type: GrantFiled: February 20, 1987Date of Patent: December 13, 1988Assignee: Bayer AktiengesellschaftInventors: Bernhard Schulte, Werner Tischer, Werner Waldenrath, Hans Kaloff
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Patent number: 4756330Abstract: In a flow divider valve for pressure feed to a hydraulic circuit for auxiliary power steering and to a hydraulic circuit for a power take-off the interior of a hollow regulator piston receives pressure feed for distribution to the hydraulic circuits. For one such circuit, preferably the power take-off, flow passes via multiple bores and coacting flow control grooves of the regulator piston and a housing in which it reciprocates. Accordingly, a desired flow quantity and pressure advantages are achieved, in comparison with use of a single flow control bore which would require a larger piston traverse causing delays in pressure build-up as well as oscillations and strong flow pulses and energy loss.Type: GrantFiled: March 18, 1987Date of Patent: July 12, 1988Assignee: Zahnradfabrik Friedrichshafen, AG.Inventor: Werner Tischer
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Patent number: 4599262Abstract: The present invention relates to polycarbonate laminates consisting of an electrically conductive polycarbonate layer (A) containing carbon black or graphite, and an electrically insulating polycarbonate layer (B), their preparation and their use in the electrical sector.Type: GrantFiled: November 6, 1984Date of Patent: July 8, 1986Assignee: Bayer AktiengesellschaftInventors: Bernhard Schulte, Werner Tischer, Hans Kaloff, Hans-Leo Weber
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Patent number: 4553389Abstract: In a hydrostatic auxiliary power steering apparatus, a short-circuit passage of a control valve establishes a restricted flow path from a pump pressure line to a reservoir return line in the neutral position of the control valve wherein all other flow paths are blocked. A fixed flow restrictor in the pump pressure line conducts a continuous flow from one of two pumps connected to the pressure line for regulation of the fluid power steering circuit by the pressure drop across the flow restrictor. If one of the pumps is of the variable volume type, the pressure downstream of the flow restrictor is utilized to regulate pump flow adjustment. If fluid under operating pressure is supplied to both the fluid power steering circuit and another fluid operating circuit, a flow dividing valve controlled by the pressure differential across the flow restrictor distributes pressurized fluid between the two fluid circuits.Type: GrantFiled: August 3, 1982Date of Patent: November 19, 1985Assignee: Zahnradfabrik Friedrichshafen, AG.Inventors: Werner Tischer, Karl-Heinz Liebert, Rolf Fassbender
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Patent number: 4553390Abstract: A hydrostatic steering system having a hand operated metering pump and steering control valve regulating and distributing fluid flow from a servo pump to a piston servomotor of the differential pressure surface type. A compensation valve disposed in the pressure line leading to one of the opposed chambers of the piston servomotor, is actuated by a differential pressure surface dimensioned to establish a constant ratio of pressures prevailing in the opposed pressure chambers in the neutral steering position while the metering pump is ineffective to produce any differential pressure. During active steering, the compensation valve is bypassed through a check valve.Type: GrantFiled: October 19, 1984Date of Patent: November 19, 1985Assignee: Zahnradfabrik Friedrichshafen, AG.Inventors: Karl-Heinz Liebert, Werner Tischer, Rolf Fassbender
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Patent number: 4495769Abstract: A control valve for booster power steering has a back pressure check valve openable by pressure caused by wheel jolting, which check valve connects between a servopump pressure passage of the control valve through the inner bore of a valve sleeve operable within a housing bore to the inlet of a metering pump. Such valve ensures that the steering is "closed" under all circumstances including during steering to prevent pressure jolts being transmitted from the vehicle wheels due to road roughness. However, after completion of a steering operation high pressure can build up within the valve sleeve causing expansion of the valve sleeve and jamming within the housing bore, making operation difficult. Accordingly, a pressure limiting valve is provided connected to relieve the pressure within the valve sleeve bore.Type: GrantFiled: August 13, 1981Date of Patent: January 29, 1985Assignee: Zahnradfabrik Friedrichshafen, AG.Inventors: Werner Tischer, Karl-Heinz Liebert, Rolf Fassbender
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Patent number: 4488401Abstract: A flow regulating channel in a servo steering valve controls exhaust flow with varying restriction from a fluid operating motor while controlling operation of a separate steering servo motor on a priority basis. An operational control valve for the fluid operating motor has a valve passage that is open only in the neutral position to complete a recirculating flow path from a common servo pump through the flow regulating channel that is fully open in the neutral position of the steering valve.Type: GrantFiled: May 28, 1982Date of Patent: December 18, 1984Assignee: Zahnradfabrik Friedrichshafen, A.G.Inventor: Werner Tischer
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Patent number: 4466243Abstract: A flow control valve for a power steering system of the kind having a metering pump is provided with a leaf spring device stressed upon rotation of a hand steering wheel to operate a valve sleeve and the metering pump. The spring device provides a force for returning the valve sleeve to neutral position after a steering operation and comprises curved or arched springs between pressure plates. The convex sides are back-to-back between pressure plates and have curved ends supported on and shaped to slide on the pressure plates with minimum friction as the springs are compressed. The pressure plates are uniquely shaped in the central areas for providing flexibility to compensate for manufacturing inaccuracies.Type: GrantFiled: September 4, 1981Date of Patent: August 21, 1984Assignee: Zahnradfabrik Friedrichshafen, A.G.Inventors: Karl-Heinz Liebert, Rolf Fassbender, Werner Tischer
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Patent number: 4395877Abstract: Maximum angular displacement between the rotatable valve elements of a steering control valve is governed solely by the circular pitch of the piston gear associated with the metering gear pump in a hydrostatic fluid power steering system. A pair of fluid collecting manifolds in the control valve respectively communicate with the expanding and contracting pockets in the gear pump to form part of the flow paths between the gear pump and the fluid power steering motor.Type: GrantFiled: January 22, 1980Date of Patent: August 2, 1983Assignee: Zahnradfabrik Friedrichshafen, AG.Inventors: Karl-Heinz Liebert, Werner Tischer