Patents by Inventor Eberhard Hofmann

Eberhard Hofmann 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: 10910550
    Abstract: The invention relates to a piezoceramic material with reduced lead content, based on potassium sodium niobate (PSN) and having a defined parent composition. According to the invention the manner of addition of a mixture of Pb, Nb and optionally Ag and optionally Mn gives a wide sintering range together with reproducible electrical and mechanical properties of the material.
    Type: Grant
    Filed: August 7, 2014
    Date of Patent: February 2, 2021
    Assignee: PI CERAMIC GMBH
    Inventors: Eberhard Hennig, Antje Kynast, Michael Töpfer, Michael Hofmann
  • Patent number: 10828739
    Abstract: The invention relates to a tool holder (10) which is embodied for rotation around a tool holder rotation axis (D) and which comprises at its one axial longitudinal end (10a) a tool segment (14) for receiving a tool, and at its other axial longitudinal end (10b) a coupling segment (16) for torque-transferring coupling to a machine tool (78), a measurement apparatus (28) for sensing data relating to the operation of the tool holder (10) being provided on the tool holder (10), which apparatus encompasses at least the following components:—at least one sensor (30, 32, 34, 36) supplying a sensed signal;—a signal transfer apparatus (38) for transferring a measured signal;—an electrical circuit (40) connected in signal-transferring fashion to the sensor (30, 32, 34, 36) and to the signal transfer apparatus (38); and—an energy supply apparatus (42) that is connected to the signal transfer apparatus (38) and to the electrical circuit (40).
    Type: Grant
    Filed: October 21, 2016
    Date of Patent: November 10, 2020
    Assignee: Haimer GmbH
    Inventors: Franz Ziegltrum, Kim-Carolin Landfried, Ferdinand Keil, Klaus Hofmann, Thomas Grosch, Eberhard Abele
  • Publication number: 20190322589
    Abstract: The invention relates to a lead-free piezoceramic material based on bismuth sodium titanate (BST) having the following parent composition: x(Bi0.5Na0.5)TiO3-yBaTiO3-zSrTiO3 where x+y+z=1 and 0<x<1, 0<y<1, 0?z?0.07 or x(Bi0.5Na0.5)TiO3-yBaTiO3-zCaTiO3 where x+y+z=1 and 0<x<1, 0<y<1, 0<z?0.05 or x(Bi0.5Na0.5)TiO3-y(Bi0.5K0.5)TiO3-zBaTiO3 where x+y+z=1 and 0<x<1, 0<y<1, 0?z<1, characterized by addition of a phosphorus-containing material in a quantity that gives a phosphorus concentration of from 100 to 2000 ppm in the piezoceramic material.
    Type: Application
    Filed: January 14, 2019
    Publication date: October 24, 2019
    Inventors: Eberhard Hennig, Antje Kynast, Michael Töpfer, Michael Hofmann
  • Patent number: 8967808
    Abstract: An ophthalmological measuring system, for obtaining biometric data of an eye, provided with the necessary calibration and check devices for monitoring the functionality and the calibration status. The ophthalmological measuring system includes an illumination source for illuminating an eye with light and with a sensor for recording and analyzing back-scattered or reflected light components and a controller. At least one calibration and check system integrated in the ophthalmological measuring system for monitoring the functional and calibration status is provided. A device is also provided which houses the calibration and test structures and which reads off the individual physical data therefrom by an interface. The ophthalmological measuring system is in particular provided for determining biometrical data but can also be used for ophthalmological, dermatological or other devices which require calibration and/or functional checking at regular intervals.
    Type: Grant
    Filed: November 4, 2009
    Date of Patent: March 3, 2015
    Assignee: Carl Zeiss Meditec AG
    Inventors: Gerard Antkowiak, Martin Hacker, Ingo Koschmieder, Roland Bergner, Ralf Ebersbach, Thomas Pabst, Eberhard Hofmann, Michael Guentzschel, Steffen Dubnack
  • Patent number: 8408703
    Abstract: A spectrometer is described, especially for an optical coherence tomograph for detecting parameters of the human eye, with said spectrometer having an input for measurement radiation to be analyzed, fanning the measurement radiation spectrally out along a direction in a fan and guiding it onto a detector that extends along the direction and comprises a plurality of detector pixels that are sensitive to the measurement radiation, with the spectrometer having an adjusting element which can be adjusted in a controlled manner to adjust the relative position of the fan and the detector, thereby optimizing the incidence position of the fan on the detector, in which it is provided that the detector has at least two superimposed, adjacent pixel lines, and a control device is provided which reads out the superimposed pixels of a plurality of pixel lines in a combined manner for a spectral analysis of the measurement radiation in a pixel binning and evaluates signal differences between superimposed pixels to control th
    Type: Grant
    Filed: September 24, 2008
    Date of Patent: April 2, 2013
    Assignee: Carl Zeiss Meditec AG
    Inventors: Martin Hacker, Roland Bergner, Ralf Ebersbach, Klaus-Ditmar Voigt, Roland Barth, Eberhard Hofmann, Peter Klopfleisch
  • Publication number: 20110299038
    Abstract: An ophthalmological measuring system, for obtaining biometric data of an eye, provided with the necessary calibration and check devices for monitoring the functionality and the calibration status. The ophthalmological measuring system includes an illumination source for illuminating an eye with light and with a sensor for recording and analyzing back-scattered or reflected light components and a controller. At least one calibration and check system integrated in the ophthalmological measuring system for monitoring the functional and calibration status is provided. A device is also provided which houses the calibration and test structures and which reads off the individual physical data therefrom by an interface. The ophthalmological measuring system is in particular provided for determining biometrical data but can also be used for ophthalmological, dermatological or other devices which require calibration and/or functional checking at regular intervals.
    Type: Application
    Filed: November 4, 2009
    Publication date: December 8, 2011
    Applicant: CARL ZEISS MEDITEC AG
    Inventors: Gerard Antkowiak, Martin Hacker, Ingo Koschmieder, Roland Bergner, Ralf Ebersbach, Thomas Pabst, Eberhard Hofmann, Michael Guentzschel, Steffen Dubnack
  • Patent number: 7887185
    Abstract: The invention is directed to an arrangement and a method for measuring the anterior segment of the eye using interferometric means. The eye is illuminated by a convergent beam bundle and aligned with the optical axis of the measuring device by generating directional stimuli and accommodation stimuli by means of a display which is mirrored into the beam path.
    Type: Grant
    Filed: May 5, 2008
    Date of Patent: February 15, 2011
    Assignee: Carl Zeiss Meditec AG
    Inventors: Roland Barth, Roland Bergner, Klaus-Ditmar Voigt, Frank Behrendt, Burkhard Dietzel, Eberhard Hofmann, Gert Stober, Peter Klopfleisch
  • Publication number: 20100214533
    Abstract: A spectrometer is described, especially for an optical coherence tomograph (1) for detecting parameters of the human eye, with said spectrometer having an input for measurement radiation to be analyzed, fanning the measurement radiation spectrally out along a direction in a fan and guiding it onto a detector that extends along the direction and comprises a plurality of detector pixels that are sensitive to the measurement radiation, with the spectrometer (2) having an adjusting element (5) which can be adjusted in a controlled manner to adjust the relative position of the fan and the detector (8), thereby optimizing the incidence position (F) of the fan on the detector (8), in which it is provided that the detector (8) has at least two superimposed, adjacent pixel lines, and a control device (9) is provided which reads out the superimposed pixels of a plurality of pixel lines in a combined manner for a spectral analysis of the measurement radiation in a pixel binning and evaluates signal differences between s
    Type: Application
    Filed: September 24, 2008
    Publication date: August 26, 2010
    Applicant: CARL ZEISS MEDITEC AG
    Inventors: Martin Hacker, Roland Bergner, Ralf Ebersbach, Klaus-Ditmar Voigt, Roland barth, Eberhard Hofmann, Peter Klopfleisch
  • Publication number: 20080252852
    Abstract: The invention is directed to an arrangement and a method for measuring the anterior segment of the eye using interferometric means. The eye is illuminated by a convergent beam bundle and aligned with the optical axis of the measuring device by generating directional stimuli and accommodation stimuli by means of a display which is mirrored into the beam path.
    Type: Application
    Filed: May 5, 2008
    Publication date: October 16, 2008
    Inventors: Ronald Barth, Ronald Bergner, Klaus-Ditmar Voigt, Frank Behrendt, Burkard Dietzel, Eberhard Hofmann, Gert Stober, Peter Klopfleisch
  • Patent number: 7394979
    Abstract: A camera adapter for optical devices, in particular microscopes. The present solution includes a camera adapter which enables any video cameras and photographic cameras to connect to an existing image out-coupling system, e.g., the beam splitter of a microscope. The adapter can also be used for stereo microscopes. The camera adapter is arranged between the image out-coupling element and the camera. Its housing has two connection pieces. The microscope-side connection piece has a quick-change device and the camera-side connection piece has a filter thread. The technical solution provides a camera adapter for connecting digital cameras to a microscope. By using intermediate rings, the camera adapter is suitable for different cameras and facilitates exchange of cameras. The camera can be positioned in such a way that the observer can view the object through the eyepiece as well as on the camera monitor without substantially changing his/her sitting position.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: July 1, 2008
    Assignee: Carl Zeiss Meditec AG
    Inventors: Egon Luther, Ingo Koschmieder, Jan Buchheister, Eberhard Hofmann, Mario Gerlach, Stephan Ruehling
  • Patent number: 7380939
    Abstract: The invention is directed to an arrangement and a method for measuring the anterior segment of the eye using interferometric means. The eye is illuminated by a convergent beam bundle and aligned with the optical axis of the measuring device by generating directional stimuli and accommodation stimuli by means of a display which is mirrored into the beam path.
    Type: Grant
    Filed: May 14, 2004
    Date of Patent: June 3, 2008
    Assignee: Carl Zeiss Meditec AG
    Inventors: Roland Barth, Roland Bergner, Klaus-Ditmar Voigt, Frank Behrendt, Burkhard Dietzel, Eberhard Hofmann, Gert Stober, Peter Klopfleisch
  • Publication number: 20070052925
    Abstract: The invention is directed to an arrangement and a method for measuring the anterior segment of the eye using interferometric means. The eye is illuminated by a convergent beam bundle and aligned with the optical axis of the measuring device by generating directional stimuli and accommodation stimuli by means of a display which is mirrored into the beam path.
    Type: Application
    Filed: May 14, 2004
    Publication date: March 8, 2007
    Inventors: Roland Barth, Roland Bergner, Klaus-Ditmar Voigt, Frank Behrendt, Burkhard Dietzel, Eberhard Hofmann, Gert Stober, Peter Klopfleisch
  • Publication number: 20060077535
    Abstract: A camera adapter for optical devices, in particular microscopes. The present solution is directed to a camera adapter which makes it possible to connect any video cameras and photographic cameras to an existing image out-coupling system, e.g., the beam splitter of a microscope. The adapter can also be used for stereo microscopes and in particular for ophthalmic microscopes. The camera adapter is arranged between the image out-coupling element and the camera. Its housing has two connection pieces. The microscope-side connection piece has a quick-change device and the camera-side connection piece has a filter thread. The technical solution provides a camera adapter for connecting digital cameras, preferably having a monitor at the back of the housing, to a microscope, particularly an ophthalmic microscope. By using intermediate rings, the camera adapter is suitable for different cameras and facilitates exchange of cameras.
    Type: Application
    Filed: July 18, 2003
    Publication date: April 13, 2006
    Inventors: Egon Luther, Ingo Koschmieder, Jan Buchheister, Eberhard Hofmann, Mario Gerlach, Stephan Ruehling
  • Patent number: 6514240
    Abstract: An adapter for connecting and releasably and rigidly positioning a laser link on the housing of different slit lamp microscopes comprising a base, a fastening device on one end for fastening to a housing of a slit lamp microscope, a coupling device for coupling the laser link to the housing of the slit lamp microscope in a releasable and rigid manner, the coupling device for complementary engagement with a coupling device on the laser link.
    Type: Grant
    Filed: May 17, 2001
    Date of Patent: February 4, 2003
    Assignee: Carl Zeiss Jena GmbH
    Inventors: Frank Luemkemann, Eberhard Hofmann
  • Publication number: 20020029033
    Abstract: An adapter is disclosed for ophthalmologic equipment for the defined connection and positioning of a laser link on the housing of different slit lamp microscopes . The adapter comprises a base body, on the one end of which a fastening device is provided for fastening it to the housing of a slit lamp microscope in a manner that is positionally aligned, releasable and has no play, and on the other end of which contiguous to the laser link a first device of coupling or coupling elements and/or position securing elements are provided for coupling the laser link to the housing of a slit lamp microscope in a manner that is positionally aligned, releasable and has no play. This first coupling device can be engaged in a rigid operative connection with a matching complementary second coupling device of the laser link.
    Type: Application
    Filed: May 17, 2001
    Publication date: March 7, 2002
    Applicant: Carl Zeiss Jena GmbH
    Inventors: Frank Luemkemann, Eberhard Hofmann
  • Patent number: 6006511
    Abstract: For a separating roll, which finds application on an open end spinning machine, the proposal is made that a spiral trim wire be preformed and precoated before the trim wire is installed upon the circumference of the roll. In this way, separating rolls of the most varying materials may be employed since the rolls themselves need not undergo the coating process. Further, the trim wire may be preformed into a spiral before fitting on the separating roll. Moreover, a process for the production of the trim wire is presented. During the process of coating, the preformed spiral windings are held at an axial distance from one another.
    Type: Grant
    Filed: February 26, 1998
    Date of Patent: December 28, 1999
    Assignee: Rieter Ingolstadt Spinnereimaschinenbau AG
    Inventors: Eberhard Hofmann, Klaus Schoberth, Christian Gobel
  • Patent number: 5913806
    Abstract: The present invention relates to a device for the conveying of fibers from an opener roller (31) installed in a fixed opener roller housing (30) to the collection surface (43) of a spinning rotor (4) of an open-end spinning device (1). It is provided with a rotor lid mounted on a swivel pin which receives a fiber feeding channel (6). The fiber feeding channel (6) can be brought into contact with a first contact surface (62) surrounding its inlet opening (60) against a second contact surface (35) located on the opener roller housing. It extends until directly in front of the collection surface of the spinning rotor (4). A lid extension extends through an opening in the spinning rotor (4) into the spinning rotor. In the lid extension the fiber feeding channel (6) lets out into the spinning rotor (4). The contact surfaces are essentially tangential to the circumferential surface of the opener roller and parallel to the opening of the spinning rotor or are inclined towards the opening of the spinning rotor.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: June 22, 1999
    Assignee: Rieter Ingolstadt Spinnereimaschinenbau AG
    Inventors: Erich Bock, Kurt Lovas, Edmund Schuller, Eberhard Hofmann
  • Patent number: 5901546
    Abstract: With channels for the conveying of fibers, fiber slivers or yarns on spinning machines, problems are encountered in their manufacture. The channels must be made with a certain inside contour, where at the same time the quality of the surface inside the channel must be very good. The high surface quality is required in order to ensure trouble-free conveying. A channel is therefore proposed which is made as a tubular component, consisting of a metallic material and which has been produced by forming its interior by a medium under pressure. It is proposed for an open-end rotor spinning device to form the conveying channel separately from the other components of the lid of the rotor housing and to insert the channel into the lid. It is proposed in that case to use a channel according to the design shown above.
    Type: Grant
    Filed: August 12, 1997
    Date of Patent: May 11, 1999
    Assignee: Rieter Ingolstadt Spinnereimaschinenbau AG
    Inventors: Kurt Lovas, Eberhard Hofmann
  • Patent number: 5265406
    Abstract: In an open-end spinning device a yarn draw-off nozzle suitable to ensure constant spinning conditions even at very high rotational speeds is provided. This is achieved in that the yarn draw-off nozzle is designed so as to be especially capable of heat dissipation and thus being capable of preventing a heat accumulation in the area of the yarn draw-off nozzle thanks to its high capability of heat dissipation.
    Type: Grant
    Filed: August 10, 1992
    Date of Patent: November 30, 1993
    Assignee: Schubert & Salzer Maschinenfabrik AG
    Inventors: Eberhard Hofmann, Johann Pohn
  • Patent number: 5085047
    Abstract: An opening roll for an open-end spinning device upon which clothing is carried. The opening roll includes a unitary member that has enlarged surfaces provided on circumferentially spaced ribs extending between a centrally located hub and a ring shaped concentric surface upon which pressure can be applied for ejecting the unitary member from a mold and for permitting drilling and filling with material for balancing.
    Type: Grant
    Filed: March 14, 1991
    Date of Patent: February 4, 1992
    Assignee: Schubert & Salzer Maschinenfabrik Aktiengesellschaft
    Inventor: Eberhard Hofmann