Patents by Inventor John Engdahl

John Engdahl 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: 7374500
    Abstract: The present invention is an improved putter that assists a player in perfecting a putt stroke during practice and repeating it with the same club during play. The shaft is attached to the clubhead such that it can swivel from a practice configuration to a play configuration. The putter also comprises a hosel with an attached alignment cap has lobes which matingly engage a series of recesses on the clubhead to secure the clubhead to the shaft. The putter conforms to the Rules of Golf so that the player does not have to change clubs between practice and play. The club may be used for either a right or left-handed stroke.
    Type: Grant
    Filed: September 15, 2005
    Date of Patent: May 20, 2008
    Inventor: Duane Charles John Engdahl
  • Publication number: 20070029494
    Abstract: A partitioned pipeline read-out circuit architecture eliminates real-time constraints from off-chip read-out control electronics in a solid-state radiation detector system, so that an efficient decoupled architecture is possible. The front-end electronics includes a multi-channel ASIC with independently triggered charge sensitive pre-amplifiers, shaper circuits, and switched sample-and-hold capacitor circuits for each photodiode or pixel of the detector module. With this structure, individual photodiodes of the photodetector array can detect and store scintillation events independently and randomly. The ASIC is interfaced to an external successive approximation A/D converter for conversion and subsequent input to a data processing apparatus.
    Type: Application
    Filed: June 24, 2005
    Publication date: February 8, 2007
    Inventors: James Caruba, John Engdahl
  • Patent number: 7041004
    Abstract: The present invention is an improved putter that combines several features to provide a balanced putter, which assists a player in perfecting a putt stroke during practice and repeating it with the same club during play. The shaft is attached to the clubhead such that it can swivel from a practice configuration to a play configuration. The clubhead has tapered top and bottom surfaces such that the angle of the shaft relative to the sole of the putter is no more than 80 degrees. The clubhead has a playing surface on one face that is parabolic and can be flat in the extreme. The clubhead has a practice surface on the other face that is curved, preferably elliptical, to assist the golfer in learning the proper stroke. The putter conforms to the Rules of Golf so that the player does not have to change clubs between practice and play. The club may be used for either a right- or left-handed stroke.
    Type: Grant
    Filed: August 16, 2004
    Date of Patent: May 9, 2006
    Inventor: Duane Charles John Engdahl
  • Publication number: 20060065840
    Abstract: A dynamic Single Photon Emission Computed Tomography (SPECT) system utilizes an array of modular detectors structured in a dome shape and being independently tiltable in polar or azimuth angle. The system can be used to image cardiovascular studies as well as other quantitative studies and 3D imaging studies, without requiring movement or motion of the detectors.
    Type: Application
    Filed: September 28, 2005
    Publication date: March 30, 2006
    Inventors: Jinhun Joung, John Engdahl
  • Publication number: 20060000978
    Abstract: A multi-pinhole collimator nuclear medical imaging detector divides a target object space into many non-overlapping areas and projects a minified image of each area onto a segmented detector, where each segment functions as an independent detector or imaging cell. Septa may be provided between the collimator and the detector, to physically isolate the segments.
    Type: Application
    Filed: June 30, 2004
    Publication date: January 5, 2006
    Inventors: John Engdahl, Jinhun Joung, Samir Chowdhury
  • Publication number: 20050023474
    Abstract: An improved method of, and apparatus for, nuclear imaging takes advantage of the ability to determine the depth of gamma ray/electron interaction within a semiconducting gamma ray detector to determine the (most highly probable) location of the first gamma ray/electron interaction within the detector. Lines of interaction constructed between opposing detector arrays, extending between the location of the first gamma ray/electron interaction in each detector associated with the coincident detection of gamma radiation, permits a positron-emitting object of interest to be imaged according to protocols known in the art, but with better spatial resolution than previously believed to have been known.
    Type: Application
    Filed: June 23, 2004
    Publication date: February 3, 2005
    Applicant: Siemens Medical Systems,Inc.
    Inventors: Dennis Persyk, John Engdahl
  • Publication number: 20050006589
    Abstract: A gamma camera having a scintillation detector formed of multiple bar detector modules. The bar detector modules in turn are formed of multiple scintillation crystal bars, each being designed to have physical characteristics, such as light yield, to achieve a sufficient spatial resolution for nuclear medical imaging applications. According to another aspect of the invention, the bar detector modules are arranged in a three-dimensional array, where each module is made up of a two-dimensional array of bar detectors with at least one photosensor optically coupled to each end of the module. Such a camera can be used for both PET (coincidence) and single photon imaging applications. According to another aspect of the invention, a bar detector gamma camera is provided, which utilizes an improved positioning algorithm that greatly enhances spatial resolution in the z-axis direction (i.e., the direction along the length of the scintillation crystal bar).
    Type: Application
    Filed: June 27, 2003
    Publication date: January 13, 2005
    Inventors: Jinhun Joung, Samir Chowdhury, John Engdahl
  • Patent number: 6776727
    Abstract: Several features are combined to provide a balanced putter, which assists a player in perfecting a putt stroke during practice and repeating it with the same club during play. The clubhead is substantially symmetric around the shaft and has tapered top and bottom surfaces such that the angle of the shaft relative to the sole of the putter is no more than 80 degrees. The shaft is attached at the center of the clubhead, and the clubhead and shaft are arranged so that the center of gravity of the clubhead strikes the center of the golf ball. The clubhead has a playing surface on one face that is parabolic and can be flat in the extreme. The clubhead has a practice surface on the other face that is curved, preferably elliptical, to assist the golfer in learning the proper stroke. The putter conforms to the Rules of Golf so that the player does not have to change clubs between practice and play. The club may be used for a right- or left-handed stroke.
    Type: Grant
    Filed: January 23, 2003
    Date of Patent: August 17, 2004
    Inventor: Duane Charles John Engdahl
  • Publication number: 20040147332
    Abstract: Several features are combined to provide a balanced putter, which assists a player in perfecting a putt stroke during practice and repeating it with the same club during play. The clubhead is substantially symmetric around the shaft and has tapered top and bottom surfaces such that the angle of the shaft relative to the sole of the putter is no more than 80 degrees. The shaft is attached at the center of the clubhead, and the clubhead and shaft are arranged so that the center of gravity of the clubhead strikes the center of the golf ball. The clubhead has a playing surface on one face that is parabolic and can be flat in the extreme. The clubhead has a practice surface on the other face that is curved, preferably elliptical, to assist the golfer in learning the proper stroke. The putter conforms to the Rules of Golf so that the player does not have to change clubs between practice and play. The club may be used for a right- or left-handed stroke.
    Type: Application
    Filed: January 23, 2003
    Publication date: July 29, 2004
    Inventor: Duane Charles John Engdahl