Patents by Inventor John Hammargren

John Hammargren 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: 9797202
    Abstract: A drill bit for rock drilling tools includes a drill bit head having a front surface including a face surface defining a forward-most end of the drill bit head. The face surface has an outer edge, a gauge surrounding the face surface, the gauge having an inner edge, and a transition region that extends in a direction of a longitudinal axis of the drill bit between the outer edge of the face surface and the inner edge of the gauge. An entirety of the face surface from which the cutting surfaces extend is non-flat so that a center of the face surface is axially forward of the outer edge of the face surface. The gauge includes a first gauge surface defining a first angle with the longitudinal axis over a first portion of a circumference of the gauge and a second gauge surface defining a second angle with the longitudinal axis over a second portion of the circumference of the gauge.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: October 24, 2017
    Assignee: SANDVIK INTELLECTUAL PROPERTY AB
    Inventors: Andreas Rindeskar, John Hammargren
  • Publication number: 20160348442
    Abstract: A percussive rock drill bit has a head and a shank in which a plurality of flushing grooves extend radially outward and axially rearward from a front face. The flushing grooves are configured to optimize the axially rearward flow of rock particles and fines entrained in the flushing fluid. In particular, each groove is generally convex relative to a longitudinal axis of the drill bit and is declined continuously relative to the axis from a first groove end to a second groove end.
    Type: Application
    Filed: December 15, 2014
    Publication date: December 1, 2016
    Applicant: SANDVIK INTELLECTUAL PROPERTY AB
    Inventors: Andreas RINDESKAR, John HAMMARGREN
  • Publication number: 20140299388
    Abstract: A drill bit for rock drilling tools includes a drill bit head having a front surface including a face surface defining a forward-most end of the drill bit head. The face surface has an outer edge, a gauge surrounding the face surface, the gauge having an inner edge, and a transition region that extends in a direction of a longitudinal axis of the drill bit between the outer edge of the face surface and the inner edge of the gauge. An entirety of the face surface from which the cutting surfaces extend is non-flat so that a center of the face surface is axially forward of the outer edge of the face surface. The gauge includes a first gauge surface defining a first angle with the longitudinal axis over a first portion of a circumference of the gauge and a second gauge surface defining a second angle with the longitudinal axis over a second portion of the circumference of the gauge.
    Type: Application
    Filed: October 29, 2012
    Publication date: October 9, 2014
    Applicant: Sandvik Intellectual Property AB
    Inventors: Andreas Rindeskar, John Hammargren
  • Patent number: 5944680
    Abstract: A method of predicting critical points in patient respiration includes monitoring at least one characteristic of a respiratory effort waveform of a patient to detect a respiratory event. A refractory period is defined that includes a hard refractory period during which time the respiratory event cannot be responded to and a soft refractory period following the hard refractory period. The respiratory event outside of the refractory period is detected as a function of a first set of predetermined parameters for the monitored at least one characteristic and the respiratory event within the soft refractory period is detected as a function of a second set of predetermined parameters for the monitored at least one characteristic. The respiratory event may be inspiration onset and the characteristic of the respiratory effort waveform monitored is at least one of slope and amplitude.
    Type: Grant
    Filed: June 26, 1996
    Date of Patent: August 31, 1999
    Assignee: Medtronic, Inc.
    Inventors: Mark A. Christopherson, Johann J. Neisz, John Hammargren
  • Patent number: 5697884
    Abstract: A cardiac assist device having circadian muscle stimulation. In particular the present invention operates in one of two states, either day mode or night mode. During the day mode, muscle stimulation and conditioning are performed according to a first schedule. During the night mode, muscle stimulation and conditioning are performed according to a second schedule. In addition, the night mode is only reached if the night mode is permitted, a set number of sensed beats are less than the night mode rate, and the time of day is nighttime. The night mode is interrupted if the night mode is turned off, the time of day is daytime, or a set number of beats are greater than the night rate. In short, the present invention provides for skeletal muscle stimulation at a less fatiguing level during the night than during the day.
    Type: Grant
    Filed: August 17, 1995
    Date of Patent: December 16, 1997
    Assignee: Medtronic, Inc.
    Inventors: David Francischelli, Kendra K. Gealow, John Hammargren, Johann J. Neisz
  • Patent number: 5697952
    Abstract: A cardiac assist device having muscle augmentation after a confirmed arrhythmia. In particular the present invention operates, in a first embodiment, to sense a cardiac event, next it determines whether the cardiac event is a cardiac arrhythmia, if the event is not a cardiac arrhythmia the devices delivers stimulation to a skeletal muscle grafted about a heart, but if the event is a cardiac arrhythmia the device inhibits delivery of skeletal muscle stimulation and once the arrhythmia is confirmed, then delivers therapeutic stimulation to the heart. In a second embodiment the present invention operates to re-initiate skeletal muscle stimulation once the arrhythmia is confirmed but prior to the delivery of the therapeutic stimulation to the heart.
    Type: Grant
    Filed: August 17, 1995
    Date of Patent: December 16, 1997
    Assignee: Medtronic, Inc.
    Inventors: David Francischelli, John Hammargren, Johann J. Neisz, David K. Peterson, Koen J. Weijand
  • Patent number: 5607385
    Abstract: A device and algorithm for a combined cardiomyostimulator and a cardiac pacer-cardioverter-defibrillator.
    Type: Grant
    Filed: August 17, 1995
    Date of Patent: March 4, 1997
    Assignee: Medtronic, Inc.
    Inventors: David Francischelli, Kendra K. Gealow, Pierre A. Grandjean, John Hammargren, Johann J. Neisz, David K. Peterson
  • Patent number: D705827
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: May 27, 2014
    Assignee: Sandvik Intellectual Property AB
    Inventors: John Hammargren, Andreas Rindeskar