Patents by Inventor John H. Letcher, III

John H. Letcher, III 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).

  • Method and apparatus for reflective ultrasonic imaging
    Patent number: 5253530
    Abstract: A method and related system for use in producing a representation of acoustical impedances of body materials, such as for use in ultrasonic imaging of a body for diagnostic purposes. In the method, at least one Letcher Wavelet (L.sup.M) of ultrasonic energy is introduced into the body to be diagnosed. The reflections of the ultrasonic energy are received by a transducer and sent to a CPU for transformation. The received reflections are transformed, using a technique cooperative with the characteristics of the L.sup.M wavelet, to produce a representation of the acoustical impedances from the body materials. Such representation can be in the form of data, graphical or an image, such as on a CRT. Further, the representation can be in the form of the density of the body materials or the velocity of sound through the body materials.
    Type: Grant
    Filed: August 12, 1991
    Date of Patent: October 19, 1993
    Inventor: John H. Letcher, III
  • Noise suppression in magnetic resonance imaging
    Patent number: 4893082
    Abstract: A method and associated system are disclosed for suppressing the undesirable effect of noise found in signals, such as from a magnetic resonance miager's (MRI) receiving antenna. The method convolves a sampled real and secondary signal taken from a signal detector with a transfer function, which is expressed in terms of the power spectrum of the measured signal with noise and measured power spectrum of the noise.
    Type: Grant
    Filed: February 13, 1989
    Date of Patent: January 9, 1990
    Inventor: John H. Letcher, III