Patents Assigned to Hawe Neos Dental Dr. H. V. Weissenfluh AG
  • Patent number: 6312257
    Abstract: Instead of a bunch of bristles coated with abrasive particles, the brush for surface treatments in restorative dentistry comprises one or several lamellar abrasive elements. In the manner of a lametta strip, the abrasive elements are divided by at least one incision, such that a plurality of bristle portions is obtained. Due to the planar configuration of the bristle portions themselves, the latter are easily bendable in at least one direction. If the arrangement of the abrasive elements is such that this direction of easy bending ability is approximately tangential to the intended rotational direction of the brush, the overall flexibility of the brush is substantially increased, thus allowing a substantially improved compliance with application-specific requirements.
    Type: Grant
    Filed: September 11, 2000
    Date of Patent: November 6, 2001
    Assignee: Hawe Neos Dental Dr. H. V. Weissenfluh AG
    Inventors: Felix Aschmann, Beat A. Von Weissenfluh
  • Patent number: 6142856
    Abstract: The sharpening device for dental instruments comprises a chuck head holder having an arcuate member to one end of which the chuck head with the chuck is radially attached while the arcuate member is guided in a base of the device. The grinding head with the grinding wheel comprises a grinding head bearing which is rotatable around the mid-perpendicular of the base and includes a pivot which extends in parallel to the surface of the base and on which the grinding head turns, the latter being under the action of a tension spring in such a manner that the grinding wheel surface, which is disposed at an angle with respect to the mid-perpendicular, is pressed against the surface to be treated of the instrument. Moreover, the chucking assembly allows an essentially improved chucking of the instrument due to a thrust bolt which is actuated by an eccentric member and presses the shank of the instrument against the chuck opening. The head of the thrust bolt may be movable in order to adapt to the shape of the shank.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: November 7, 2000
    Assignee: Hawe Neos Dental Dr. H. v. Weissenfluh AG
    Inventor: Ludwig Romhild
  • Patent number: 6019603
    Abstract: The dental device comprises an abrasive disk having a hub made of synthetic material and a spindle with a collet, the opening of the hub having an inner bead and the collet a rotation lock and an axial lock for receiving said bead in the hub opening, the greatest diameter of the spindle with its rotation lock being greater than the diameter of the hub opening with its bead. This construction allows, on one hand, an easier mounting of the abrasive disk on the spindle, and, on the other hand, a high torque transmission.
    Type: Grant
    Filed: February 18, 1999
    Date of Patent: February 1, 2000
    Assignee: Hawe Neos Dental Dr. H. v. Weissenfluh AG
    Inventors: Hans Von Weissenfluh, Beat Kilcher, Beat A. Von Weissenfluh
  • Patent number: 5951801
    Abstract: The method for joining a metal foil with a synthetic material foil comprises unwinding both materials from a supply roll each, and subjecting the synthetics foil, prior to the application of an adhesive, to a corona discharge on a narrow border region. The metal foil and the synthetic material foil are then pressed together and irradiated by ultraviolet radiation causing polymerization of the adhesive. The composite foil material thus obtained is transferred to a further processing station. There the dental matrix can be punched out of such a composite sheet material, having a high tensile strength, whose metal portion can easily be inserted between two adjacent teeth whereas the transparent synthetic material part allows light curing of the dental filling material.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: September 14, 1999
    Assignee: Hawe Neos Dental DR. H. v. Weissenfluh AG
    Inventors: Beat A. v. Weissenfluh, Beat Kilcher
  • Patent number: 5775905
    Abstract: The cup to be used as a paste carrier for dental hygienic consists of a rubber elastic material and can be driven for rotation by a hand piece. The cup comprises a paste receiving part, the inner side enlarging towards its open edge as well as the outer side of the cup enlarging towards its open edge comprising spiraled ribs which are running in the opposite direction to the rotational direction of the hand piece. The structure on the inner side of the paste receiving part allows a continuous supply of paste and a cooling of the cup, and the structure of the outer side of the cup prevents a bale formation of the mucous and guarantees an effective cooling of the cup.
    Type: Grant
    Filed: April 11, 1997
    Date of Patent: July 7, 1998
    Assignee: Hawe Neos Dental Dr. H.v. Weissenfluh AG
    Inventors: Beat A.v. Weissenfluh, Gianni Baffelli
  • Patent number: 5597553
    Abstract: The toothpaste proposed contains as an abrasive, preferably as the sold abrasive, expanded perlite, generally with a particle size in the range of 1 to 150 .mu.m, in particular with a main fraction in the region of 20 .mu.m. This gives enhanced cleaning power, and improved protection of the tooth enamel against wear and scratching.
    Type: Grant
    Filed: September 13, 1994
    Date of Patent: January 28, 1997
    Assignee: Hawe Neos Dental Dr H.v. Weissenfluh AG
    Inventors: Gianni Baffelli, Beat A. von Weissenfluh
  • Patent number: 5584692
    Abstract: In a tensioning gripper with a ring and a coaxially arranged rotary pin, both the ring and the pin are provided with a slot suitable for receiving a matrix to be tensioned. The slot of the rotary pin has a symmetry plane parallel to the longitudinal axis of the rotary pin. The sides of the slot are composed by two angled portions which are arranged symmetrically on both sides of the symmetry plane and both portions converge towards the longitudinal axis of the rotary pin, the two vertices of the portions being opposite and adjacent one another. Such a slot allows easy introduction and gripping of the matrix until, by rotating the pin, the matrix is held and tensioned.
    Type: Grant
    Filed: June 21, 1995
    Date of Patent: December 17, 1996
    Assignee: Hawe Neos Dental Dr. H. v. Weissenfluh AG
    Inventors: Hans v. Weissenfluh, Beat A. v. Weissenfluh
  • Patent number: 5562275
    Abstract: A flexible spindle suitable for transmitting a torque as well as an axial thrust is constituted by a plurality of helical spirals of wire all of the same length. Each spiral has opposite winding directions to the winding direction of the adjacent spirals and the outer diameter of each spiral is equal to the inner diameter of the spiral which surrounds it. The terminal ends of the spirals are assembled integrally with each other and with the terminal ends of a flexible member situated inside the innermost spiral. Each sprial has a length which is equal to that of the other spirals as measured along their axis when these are in their bent operating position and under those conditions under which they are designed to transmit torque and thrust, with the flexible spindle resulting not to be radially or longitudinally deformable when under stress, thus transmitting the forces without loss.
    Type: Grant
    Filed: July 11, 1995
    Date of Patent: October 8, 1996
    Assignee: Hawe Neos Dental Dr. H. v. Weissenfluh AG
    Inventors: Hans v. Weissenfluh, Beat A. v. Weissenfluh
  • Patent number: 4889489
    Abstract: A combination of a rotatable spindle and grinding disk, and a method of assembly thereof. The spindle has an end with radial slits. The grinding disk has a hub which rests on the end face of the spindle. A portion protruding from the end face of the spindle has a barrel shape or a double frustoconical shape periphery. The hub of the grinding disk has an opening through it of complementary shape to the periphery of the protruding of the spindle. The slit protruding portion is deformable for fitting into the hub opening, whereby the spindle and disk are fixed for rotation. Additional protrusions from the hub extending into the slits assure that the grinding disk does not rotate with respect to the spindle. The method includes disposing compressible material at both sides of the grinding disk or extending compressible material through the hole in the grinding disk, and then compressing the compressible material over the grinding disk the defining the hub for the grinding disk.
    Type: Grant
    Filed: February 25, 1988
    Date of Patent: December 26, 1989
    Assignee: Hawe-Neos Dental Dr. H.v. Weissenfluh AG
    Inventor: Beat Von Weissenfluh
  • Patent number: D432385
    Type: Grant
    Filed: December 4, 1998
    Date of Patent: October 24, 2000
    Assignee: Hawe Neos Dental Dr. H.v. Weissenfluh AG
    Inventors: Francesco Milani, Britta Pukall