Patents by Inventor Hans-Peter Keller

Hans-Peter Keller 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).

  • Publication number: 20120141726
    Abstract: An aircraft trim panel structure includes a thermoplastic resinated quadraxial fiberglass lay-up prepreg first open structure skin layer having at least a 28% open area. A thermoplastic resinated quadraxial fiberglass lay-up prepreg second open structure skin layer has at least a 28% open area. An open structure core layer having at least a 28% open area is sandwiched between the first open structure skin layer and the second open structure skin layer. The first open structure skin layer, the second open structure skin layer and the open structure core layer are formed into a three dimensional shape corresponding to the aircraft trim panel.
    Type: Application
    Filed: February 10, 2012
    Publication date: June 7, 2012
    Inventors: Hans-Peter KELLER, Reto BAMERT-FALLEGGER, Peter James SAJIC
  • Patent number: 8079443
    Abstract: A trim panel for an aircraft interior includes a first sound attenuating layer, a structural layer and a second sound attenuating layer. The structural layer is coupled to the exterior sound attenuating layer, and has an exterior side and an opposite interior side. The structural layer defines a plurality of passages that open to both the exterior side and the interior side so as to minimize radiation of noise due to a hydrodynamic shortcut created by each of the passages across the structural layer. The second sound attenuating layer is coupled to the structural layer and has a high sound absorption characteristic. The second sound attenuating layer is configured to be disposed adjacent to the aircraft interior.
    Type: Grant
    Filed: January 7, 2008
    Date of Patent: December 20, 2011
    Assignee: Pelzer Acoustic Products GmbH
    Inventor: Hans-Peter Keller
  • Patent number: 7954596
    Abstract: The invention relates to a multilayered acoustically and thermally effective insulation having a defined layer structure, especially for internal combustion engines of motor vehicles.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: June 7, 2011
    Assignee: Entwicklungsgesellschaft fur Akustik (EfA) mit beschrankter Haftung
    Inventors: Volkmar Schulze, Hans-Peter Keller, Volker Kursch
  • Publication number: 20110108667
    Abstract: An aircraft trim panel structure includes a thermoplastic resinated quadraxial fiberglass lay-up prepreg first open structure skin layer having at least a 28% open area. A thermoplastic resinated quadraxial fiberglass lay-up prepreg second open structure skin layer has at least a 28% open area. An open structure core layer having at least a 28% open area is sandwiched between the first open structure skin layer and the second open structure skin layer. The first open structure skin layer, the second open structure skin layer and the open structure core layer are formed into a three dimensional shape corresponding to the aircraft trim panel.
    Type: Application
    Filed: November 12, 2009
    Publication date: May 12, 2011
    Inventors: Hans-Peter KELLER, Reto BAMERT-FALLEGGER, Peter James SAJIC
  • Publication number: 20100224438
    Abstract: The invention relates to a multilayered acoustically and thermally effective insulation having a defined layer structure, especially for internal combustion engines of motor vehicles.
    Type: Application
    Filed: May 31, 2007
    Publication date: September 9, 2010
    Applicant: ENTWICKLUNGSGESELLSCHAFT FUR AKUSTIK (EFA) MIT1 BESCHRANKTER HAFLUNG
    Inventors: Volkmar Schulze, Hans-Peter Keller, Volker Kursch
  • Publication number: 20090173571
    Abstract: A trim panel for an aircraft interior includes a first sound attenuating layer, a structural layer and a second sound attenuating layer. The structural layer is coupled to the exterior sound attenuating layer, and has an exterior side and an opposite interior side. The structural layer defines a plurality of passages that open to both the exterior side and the interior side so as to minimize radiation of noise due to a hydrodynamic shortcut created by each of the passages across the structural layer. The second sound attenuating layer is coupled to the structural layer and has a high sound absorption characteristic. The second sound attenuating layer is configured to be disposed adjacent to the aircraft interior.
    Type: Application
    Filed: January 7, 2008
    Publication date: July 9, 2009
    Applicant: PELZER ACOUSTIC PRODUCTS, LLC
    Inventor: Hans-Peter Keller
  • Patent number: 7219119
    Abstract: The invention relates to a procedure for computing the Cholesky decomposition of a positive definite matrix into a product of a lower and an upper triagonal matrix having a dimension of L in a multi-channel procedure, wherein: the computation is performed in a parallel multi-processor system comprising a number P of processor modules; each processor module p computes the entries of a set R of rows of the lower triagonal matrix with R=L/P, whereby a given row j is assigned to a processor module p such that j=p+(r?1)┬ĚP with r=1, . . . , R and p=1, . . . , P; the entries of the lower triagonal matrix are obtained by means of an iteration process over the columns i, with i=1, . . .
    Type: Grant
    Filed: June 16, 2003
    Date of Patent: May 15, 2007
    Assignee: EADS Deutschland GmbH
    Inventors: Eugen Briemle, Hans-Peter Keller
  • Patent number: 7137477
    Abstract: The present invention relates to a sound absorber consisting of a first non-woven fabric facing towards the sound-emitting source having a layer thickness within a range of from 2 to 15 mm, a density within a range of from 50 to 500 kg/m3, a weight per surface area within a range of from 0.1 to 2.5 kg/m2, and a flow resistance within a range of from 50 to 1000 kNs/m4, and a second non-woven fabric facing away from the sound-emitting source has a layer thickness within a range of from 10 to 28 mm, a density within a range of from 20 to 100 kg/m3, a weight per surface area within a range of from 0.4 to 1 kg/m2, and a flow resistance within a range of from 10 to 40 kNs/m4.
    Type: Grant
    Filed: December 29, 2003
    Date of Patent: November 21, 2006
    Assignee: Clion Ireland Holding Ltd.
    Inventors: Hans-Peter Keller, Marco Schneider, Olaf Dohring, Rod Morris-Kirby, Norbert Nicolai, Colm Doris
  • Publication number: 20040238275
    Abstract: The present invention relates to a sound absorber consisting of two interconnected non-woven fabrics (1,2) bonded through thermoplastic and/or thermoset materials, wherein the non-woven fabric (1) facing towards the sound-emitting source has a layer thickness within a range of from 2 to 15 mm, a density within a range of from 50 to 500 kg/m3, a weight per surface area within a range of from 0.1 to 5 kg/m2, and a flow resistance within a range of from 50 to 1000 kNs/m4, and the non-woven fabric (2) facing away from the sound-emitting source has a layer thickness within a range of from 10 to 100 mm, a density within a range of from 20 to 100 kg/m3, a weight per surface area within a range of from 0.5 to 1 kg/m2, and a flow resistance within a range of from 10 to 40 kNs/m4, with a total thickness of the sound absorber within a range of from 12 to 30 mm and a total weight per surface area of the sound absorber within a range of from 0.5 to 3 kg/m2.
    Type: Application
    Filed: December 29, 2003
    Publication date: December 2, 2004
    Inventors: Hans-Peter Keller, Marco Schneider, Olaf Dohring, Rod Morris-Kirby, Norbert Nicolai, Colm Doris
  • Publication number: 20040034475
    Abstract: The invention relates to a procedure for computing the Cholesky decomposition of a positive definite matrix into a product of a lower and an upper triagonal matrix having a dimension of L in a multi-channel procedure, wherein:
    Type: Application
    Filed: June 16, 2003
    Publication date: February 19, 2004
    Inventors: Eugen Briemle, Hans-Peter Keller
  • Patent number: 5652415
    Abstract: A molded article for the absorption of airborne sound, to be used principally in the engine compartment of motor vehicles and particularly as a sound absorber inside partial and complete motor encapsulations, is formed by a porous absorber (1) of which the core (6), being sealed on both sides (7,8) over its complete surface by a respective PU film of a thickness less than 90 .mu.m, is made from an open-pored PU (polyurethane) foam of a thickness of at least 3 mm and about 15 mm at the most. The core comprises cavities (2-4) originating on the bottom face and formed by the injection molding process, said cavities being open only towards the bottom face (5) and having different cavity volumes and different heights (11) measured from the bottom face (5).
    Type: Grant
    Filed: May 2, 1995
    Date of Patent: July 29, 1997
    Assignee: Helmut Pelzer
    Inventors: Helmut Pelzer, Tarik Akyol, Hans Peter Keller, Rolf Guenzel
  • Patent number: 4873621
    Abstract: The method of regulation employs a simulation process for at least one state variable of an apparatus to be controlled and regulates the state variable. In the process, a curve of an operating characteristic having its base at an idle state value is traversed up to an operating state value. When re-regulating, the regulation process begins at the current value of the state variable. The value of the regulation variable corresponds to the idle state. This has the advantage of a defined initial point for re-regulation. A regulating device for performing the method of regulation comprises a series circuit containing an input circuit, a regulation circuit with a simulation device for regulating an apparatus as well as a control circuit for possible machines coupled to the apparatus. The simulation device is adjustable according to operating characteristics or apparatus parameters. Another regulating device fulfills the same function while employing a computer and correspondingly modified circuits.
    Type: Grant
    Filed: August 13, 1987
    Date of Patent: October 10, 1989
    Assignee: Gebrueder Loepfe AG
    Inventors: Beat De Coi, Hans-Peter Keller
  • Patent number: 4700289
    Abstract: The method of regulation employs a simulation process for at least one state variable of an apparatus to be controlled and regulates the state variable. In the process, a curve of an operating characteristic having its base at an idle state value is traversed up to an operating state value. When re-regulating, the regulation process begins at the current value of the state variable. The value of the regulation variable corresponds to the idle state. This has the advantage of a defined initial point for re-regulation. A regulating device for performing the method of regulation comprises a series circuit containing an input circuit, a regulation circuit with a simulation device for regulating an apparatus as well as a control circuit for possible machines coupled to the apparatus. The simulating device is adjustable according to operating characteristics or apparatus parameters. Another regulating device fulfills the same function while employing a computer and correspondingly modified circuits.
    Type: Grant
    Filed: June 25, 1984
    Date of Patent: October 13, 1987
    Assignee: Gebruder Loepfe AG
    Inventors: Beat De Coi, Hans-Peter Keller
  • Patent number: 4565224
    Abstract: The weft thread monitoring apparatus contains a detecting circuit incorporating the functions of a thread recognition circuit and a control circuit for controlling the intensity of a thread sensing or scanning beam which is affected by extraneous effects like outside light, the presence of fluff and other influences. A monitoring and controlling circuit defines monitoring and control intervals to differentiate between thread signals which are respectively correctly and incorrectly related to the operating cycle of the weaving machine and to possibly cut off the weaving machine. A sensing head can be simply mounted and dismantled at any desired location at the reed of the weaving machine so that different widths of the woven material or fabric can be manufactured using the same reed and the weft thread can be monitored. By periodic indication of the thread signal the correct run or operation of the weaving machine also can be monitored.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: January 21, 1986
    Assignee: Loepfe Brothers Limited
    Inventor: Hans-Peter Keller
  • Patent number: 4415008
    Abstract: An electronic device for monitoring the insertion or travel of the filling or weft thread on an air jet weaving machine or loom which comprises at least one air jet arranged at the picking side of the machine, and a lathe or sley beam with thereon fixed lamellae forming a reed. The device comprises a tactile weft thread travel sensor arranged at the weaving machine upstream of said air jet, a start pulse generator controlled by the weaving machine, an optoelectrical sensor located near the end of the reed adjacent the weft receiving means, and electronic circuitry controlled by said start pulse generator and optoelectrical sensor for producing an activating signal defining the time interval during which the weft thread travel is monitored.
    Type: Grant
    Filed: September 14, 1981
    Date of Patent: November 15, 1983
    Assignee: Loepfe Brothers Limited
    Inventors: Hans-Peter Keller, Max Bossard