Patents by Inventor Dietrich Hoffmann

Dietrich Hoffmann 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: 5891227
    Abstract: Aqueous dye preparations useful for producing inks for the inkjet process or writing inks or for producing aqueous alcoholic coating or printing colors comprise, based on the weight of the preparation, from 0.1 to 15% by weight of a dye quantity comprising from 90 to 100% by weight of the dye of the formula I ##STR1## where Kat.sup..sym. is the equivalent of a metal or ammonium ion, from 1 to 40% by weight of carbon black and from 0.1 to 15% by weight of polyethylene glycol.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: April 6, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Dietrich Hoffmann, Ulrike Schlosser, Erwin Czech, Walter Kurtz, Karin Heidrun Beck, Doug R. Campbell, Helmut Bellaire, Horst Belde
  • Patent number: 5354724
    Abstract: Recording materials which contain one or more optionally polymer-enrobed dye precursors, one or more optionally polymer-enrobed developers and one or more polymer-enrobed sensitizers are described.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: October 11, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Dietrich Hoffmann, Bernhard Schuler
  • Patent number: 5346931
    Abstract: Color former preparations comprisingA) a core of solid particles of a color former,B) a first envelope of a water-soluble nonionic polymer, andC) a second envelope of a crosslinked polymer,are useful for producing heat- and pressure-sensitive recording materials.
    Type: Grant
    Filed: January 24, 1992
    Date of Patent: September 13, 1994
    Assignee: BASF Aktiengesellschaft
    Inventor: Dietrich Hoffmann
  • Patent number: 5162486
    Abstract: Spherical, hard mono- or oligodisperse particles of diameter from 0.1 to 100 .mu.m are prepared by condensation of partially etherified melamine-formaldehyde precondensates which form a clear solution in water in every ratio, in an aqueous solution of a water-soluble polymer which has strongly acid groups and a K value of from 100 to 160, at pH 3 to 6 and at 20.degree. to 100.degree. C., and condensation of the resulting cloudy solution is continued until the precondensate has been consumed, resulting in a dispersion of the particles. The dispersion is neutralized. The particles can be used in the form of the aqueous dispersion or after isolation from the dispersion.The particles are spherical, hard and non-swellable and can be used, for example, as sizes for plastics, polishes, delustrants, extruders and/or as pigment.The process makes it possible to produce particles of predetermined size and size distribution.
    Type: Grant
    Filed: August 31, 1990
    Date of Patent: November 10, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinrich Follmann, Dietrich Hoffmann, Wolfgang Sliwka
  • Patent number: 4924614
    Abstract: The invention discloses a gun barrel with a novel pattern of a rifling curve. The latter proceeds at start of motion from the parabolic curve y=A+Bx+Cx.sup.2 and is supplemented with a constant D, to which is added a freely selectable exponent =d. Due to the freely selected exponent as parameter the ridge force maximum can be displaced at almost equal level between the start of motion and the barrel mouth. At the barrel mouth the ridge force drops to a minimum.
    Type: Grant
    Filed: March 12, 1985
    Date of Patent: May 15, 1990
    Assignee: Mauser-Werke Oberndorf GmbH
    Inventors: Dietrich Hoffmann, Harald Weisser
  • Patent number: 4882974
    Abstract: A method for increasing the hitting probability of multi-barreled machine weapons, especially for four-gun or gatling-type weapon systems. Through a spreading apart of the middle of hitting point locations of the individual weapon barrels, there can be achieved an improvement in the characteristics of the firing spread. This is attained in that the middle hitting point location of the individual weapon barrels is spread apart in such a manner about the middle hitting point location of all of weapon barrels of a weapon system, that the density of hits remains almost constant at a restrictedly increasing deviation from the middle of the hitting point location of all the weapon barrels. The middle hitting point location of the individual weapon barrels can be spread apart by the amount of the average standard deviation of the diring spread of the individual weapon barrels from the middle hitting point location of all weapon barrels of a weapon system.
    Type: Grant
    Filed: December 14, 1988
    Date of Patent: November 28, 1989
    Assignee: Mauser-Werke Oberndorf GmbH
    Inventors: Ingolf Reuter, Dietrich Hoffmann, Harald Weisser
  • Patent number: 4833995
    Abstract: A fin-stabilized projectile for weapons selectively possessing either a smooth, and in particular, a rifled weapon barrel, which possesses a discardable thrust ring constituted of segments arranged on the central form-fitted component, and of a through-sliding guide band, and which is provided at the tail end of the projectile with a multi-finned stabilizing guidance mechanism which is rotatable about the longitudinal axis of the projectile.
    Type: Grant
    Filed: July 14, 1986
    Date of Patent: May 30, 1989
    Assignee: Mauser-Werke Oberndorf GmbH
    Inventors: Udo Gotz, Dietrich Hoffmann, Anita Fleig, Adolf Armbruster
  • Patent number: 4725493
    Abstract: Wax compositions and carbon paper compositions based on waxes, oils and colorants contain some or all of the oil in encapsulated form.
    Type: Grant
    Filed: December 8, 1986
    Date of Patent: February 16, 1988
    Assignee: BASF Aktiengesellschaft
    Inventor: Dietrich Hoffmann
  • Patent number: 4558646
    Abstract: A projectile particularly for use in rapid fire weapons and high performance guns comprises a hollow projectile body having an exterior surface with an annular groove therearound and with a plurality of openings formed in the groove at spaced circumferential locations. A rotating band is positioned in the groove and secured against displacement caused by centrifugal and accelerating forces, portions of the band which extend through the openings. The band is advantageously injection molded directly in the groove so that portions thereof form into the openings and extend through the openings and form a closed ring on the interior of the shell of the projectile body.
    Type: Grant
    Filed: September 17, 1984
    Date of Patent: December 17, 1985
    Assignee: Mauser-Werke Oberndorf GmbH
    Inventors: Dietrich Hoffmann, Udo Gotz
  • Patent number: 4549488
    Abstract: A projectile comprises a tubular body and a sabot or impact base connected to the rear portion. The tubular body is connected to the sabot by radially extending pins, and the rear face of the body is spaced from a circular shoulder of the sabot by a distance equal to, or larger than, the diameter of the pins. To ensure a transfer of the spin of the sabot to the body, the rear face of the body is provided with a corrugation, such as teeth, or a knurling, which, at the discharge and after the pins are sheared off, digs into the surface of the circular shoulder.
    Type: Grant
    Filed: November 18, 1983
    Date of Patent: October 29, 1985
    Assignee: Mauser-Werke Oberndorf GmbH
    Inventors: Dietrich Hoffmann, Udo Gotz
  • Patent number: 4532868
    Abstract: A rotating band of projectiles is made of a compound sleeve bearing material. The compound material comprises a carrier material and a porous slide layer applied thereto and having pores filled with a polytetrafluoroethylene mixture. The outer surface of the slide layer is coated with a cover layer of a polytetrafluoroethylene mixture. The rotating band is held in place in the groove by a latching connection.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: August 6, 1985
    Assignees: Mauser-Werke Oberndorf GmbH, Karl Schmidt GmbH
    Inventors: Winfried Gleichaut, Oswin Gunther, Dietrich Hoffmann, Rolf Funke
  • Patent number: 4521654
    Abstract: A high voltage disconnect switch, including a countercontact piece having switch countercontacts and being arranged for connection to a source of high voltage. Resilient pre-contact pieces are insulatingly connected to the countercontact piece and include switch contacts disposed for contacting the switch countercontacts. Movable primary contact pieces are arranged to be movable from a first position of separation from the pre-contact pieces and the countercontact piece to a second position in which the primary contact pieces are in contact with the pre-contact pieces but not with the countercontact piece and to a third position in which the primary contact pieces are in contact with both the pre-contact pieces and the countercontact piece.
    Type: Grant
    Filed: September 26, 1983
    Date of Patent: June 4, 1985
    Assignee: Licentia Patent-Verwaltungs-G.m.b.H.
    Inventors: Wolfgang Eberhardt, Dietrich Hoffmann, Karl Kriechbaum, Erwin Rohde
  • Patent number: 4519117
    Abstract: A projectile particularly for automatic firearms in high performance machine guns comprises a cylindrical projectile body which has an annular groove around its circumference with rib portions extending radially outwardly of the bottom of the groove which are of radial extent no greater than the outer surface of the projectile body. The groove has end walls which are substantially perpendicular to the exterior surface of the body. A plastic rotating band has its inner periphery anchored in the groove with the rib portions extending to receiving recesses or grooves of the band. The ribs are advantageously radially extending elements which have their outer ends bent in axial directions and they are arranged so that there are portions of the groove of the body on each side thereof. In accordance with the method of manufacturing a projectile body, a form tool is used to effect the recessing of the projectile body or jacket to produce the intermediate ribs which are of substantially rectangular cross section.
    Type: Grant
    Filed: February 1, 1984
    Date of Patent: May 28, 1985
    Assignee: Mauser-Werke Oberndorf GmbH
    Inventors: Udo Gotz, Winfried Gleichauf, Oswin Gunther, Dietrich Hoffmann
  • Patent number: 4444118
    Abstract: A projectile, comprises, an outer metallic hollow shell body and a shell core (for example hard metal or heavy metal) disposed in the body having a first cylindrical front portion and a rear portion having a lesser diameter than the front portion. A pyrophoric material liner is disposed on and secured to the rear portion and it is dimensioned such that its outer surface does not project outwardly beyond the surface of the front portion. The liner advantageously comprises a hollow cylinder or a plurality of hollow cylinders, or it may comprise individual strips arranged circumferentially around the rear portion. It is made of pyrophoric material which may comprise a single material or a plurality of different materials of different nature. It is secured to the shell core by press-fitting, cementing or screwing.
    Type: Grant
    Filed: February 25, 1981
    Date of Patent: April 24, 1984
    Assignee: Mauser-Werke Oberndorf GmbH
    Inventors: Dietrich Hoffmann, Oswin Gunther
  • Patent number: 4393290
    Abstract: A puffer-type gas blast circuit interrupter composed of two separable contacts defining a power current path and between which an arc is created upon separation movement, in which the movable parts of the gas compressor and/or the region of contact between the contacts of an associated nominal current path are shielded from the region in which the arc is created by a shielding arrangement composed of a stationary cylinder surrounding the nozzle associated with the gas compressor and a shield member carried by the nozzle. Additionally, to reduce the movable mass of the interrupter, at least one of the current paths is constituted by two stationary contact pieces and a movable contact member carried by, and projecting from, the cylinder of the gas compressor. Further, the mass of the moving parts of the system is reduced by providing the shield member carried by the nozzle with a cylindrical projection coaxial with, and slidable relative to, the stationary cylindrical member.
    Type: Grant
    Filed: March 10, 1980
    Date of Patent: July 12, 1983
    Assignee: Licentia Patent-Verwaltungs-GmbH
    Inventors: Gunter Mittelbach, Gunter Horstmann, Werner Heiss, Dietrich Hoffmann, Gunter Siebrecht, Karl Kriechbaum, Gunter Rapp
  • Patent number: 4390764
    Abstract: In a puffer-type gas blast switch including a gas compression device composed of two components defining, respectively, a piston and a cylinder, one of the components being stationary and the other one of the components being movable for compressing a quenching gas in the chamber during switch opening, a nozzle mounted for directing the compressed quenching gas from the chamber against a switching arc, a first power contact fixed to the movable component of the gas compression device and movable between a switch closing position and a switch opening position, a second power contact arranged to be conductively connected to the first power contact when the latter is in its switch closing position and movable with the latter during at least the initial portion of its movement from the switch closing position, and spring means urging the second contact in a direction to break its connection with the first contact, the second contact is directly and releasably connected to the first contact when the first contact
    Type: Grant
    Filed: May 5, 1980
    Date of Patent: June 28, 1983
    Assignee: Licentia Patent-Verwaltungs-G.m.b.H.
    Inventors: Karl Kriechbaum, Hans-Georg Augustin, Dietrich Hoffmann