Patents by Inventor John H. Riseman

John H. Riseman 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: 4800442
    Abstract: An apparatus for generating a high quality image from a digital video signal includes a system for gamma correcting the digital video signal with a digital look up table and for converting the resultant digital signal to an analog video signal. Another circuit generates a triangular wave reference pattern signal and a comparator compares the analog video signal with the triangular wave reference pattern signal to form a pulse-width-modulated signal. A raster scanning print engine producing, for example, a laser beam, scans over a recording medium in accordance with the pulse-width-modulated signal, thereby forming an image of high quality on the recording medium of a print engine. This apparatus can also be used with an analog video signal by first converting the analog video signal to a digital video signal with an analog to digital converter.
    Type: Grant
    Filed: May 18, 1987
    Date of Patent: January 24, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: John H. Riseman, deceased, John J. Smith, Alice M. d'Entremont, Craig E. Goldman
  • Patent number: 4677571
    Abstract: A novel electronic printing system for operating both a linear-raster electro-optical display device and a linear-raster type printer, which system is capable of integrating alphanumeric and/or graphics information and gray-scale or picture information, all on a single data base from which one may either (or both) print the data out on the printer as images, or display the data on the display device as images. The system includes look-up tables storing respective first and second subsets of a set of substantially disjoint multiple-bit binary index numbers. Each of the numbers of the first subset represent information corresponding to a respective gray-scale density level rendered as a respective matrix of points forming a corresponding gray-scale cell to be printed by the printer. Each of the numbers of the second subset represent information corresponding to a unique shape of an edge rendered as a respective matrix of points to be printed by the printer.
    Type: Grant
    Filed: February 8, 1985
    Date of Patent: June 30, 1987
    Assignee: Rise Technology Inc.
    Inventors: John H. Riseman, Alice M. D'Entremont, H. Philip Peterson
  • Patent number: 4675743
    Abstract: A novel electronic printing system for operating both a linear-raster electro-optical display device and a linear-raster type printer, which system is capable of integrating alphanumeric and/or graphics information and gray-scale or picture information, all on a single data base from which one may either (or both) print the data out on the printer as images, or display the data on the device as images. The system includes look-up tables storing respective first and second subsets of a set of substantially disjoint multiple-bit binary index numbers. Each of the numbers of the first subset represent information corresponding to a respective gray-scale density level rendered as a respective matrix of points forming a corresponding gray-scale cell to be printed by the printer. Each of the numbers of the second subset represent information corresponding to a unique shape of an edge rendered as a respective matrix of points to be printed by the printer.
    Type: Grant
    Filed: June 12, 1986
    Date of Patent: June 23, 1987
    Assignee: Rise Technology Inc.
    Inventors: John H. Riseman, Alice M. D'Entremont, H. Philip Peterson
  • Patent number: 4672042
    Abstract: An ion-chromatography system for analyzing one or more ionic species of a given polarity in solution, the system comprising an ion-exchange material reactive with such species, an eluant fluid, means for adding the eluant fluid and ionic species to the separation column, a stripper column and a detector. The eluant fluid includes at least a pair of electrically neutral molecular species reactive with one another to provide ionic constituents, the molecular species being in substantial equilibrium with the ionic constituents. The stripper column is positioned at the outlet of the separation column to receive the eluant fluid from the latter and reduce the concentration of the ionic constituents in the eluant fluid. The stripper column includes a conduit relatively permeable to the neutral molecular species in the eluant and relatively impermeable to the ionic constituents.
    Type: Grant
    Filed: December 26, 1984
    Date of Patent: June 9, 1987
    Assignee: Orion Research Puerto Rico, Inc.
    Inventors: James W. Ross, Jr., Lionel S. Goldring, John H. Riseman
  • Patent number: 4321544
    Abstract: An improved temperature-compensated ion measurement method and apparatus for use therein. The method comprises placing a probe in a solution whose ion level (for example, pH) is to be measured and measuring the A.C. resistance of the probe in a manner that does not adversely affect the simultaneous measurement of the probe's D.C. potential, and then driving from these two measurements the ion level of the solution corrected for its temperature.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: March 23, 1982
    Inventor: John H. Riseman
  • Patent number: 3964988
    Abstract: A system for electrochemical monitoring for the appearance of an ionic species of interest in a first flow stream by merging the first flow stream with a second flow stream containing a mixture of the ion to be sensed and a second non-interfering tag ion in a substantially fixed ratio. A pair of ion-sensing electrodes responsive, respectively, to the ionic species of interest and the tag ion are used to detect the activity of the species at a location in the merged stream. The difference between the measured potentials of the two ionic species in the merged stream is a constant ratio which is unaffected by fluctuations in the rate at which the two flow streams are mixed.
    Type: Grant
    Filed: January 19, 1972
    Date of Patent: June 22, 1976
    Assignee: Orion Research Incorporated
    Inventors: John H. Riseman, Martin Frant
  • Patent number: 3950231
    Abstract: An improved gas-sensing electrochemical cell for measuring hydrogen cyanide gas in a sample solution. The cell comprises a potentiometric silver ion-sensitive electrode and a reference electrode, both in contact with an internal standard solution comprising an aqueous solution of an argento cyanide complex. A hydrophobic hydrogen cyanide gas-permeable membrane separates the sample solution from the internal solution.
    Type: Grant
    Filed: August 30, 1974
    Date of Patent: April 13, 1976
    Assignee: Orion Research Incorporated
    Inventors: Martin S. Frant, John H. Riseman, John A. Krueger
  • Patent number: RE38942
    Abstract: An apparatus for generating a high quality image from a digital video signal includes a system for gamma correcting the digital video signal with a digital look up table and for converting the resultant digital signal to an analog video signal. Another circuit generates a triangular wave reference pattern signal and a comparator compares the analog video signal with the triangular wave reference pattern signal to form a pulse-width-modulated signal. A raster scanning print engine producing, for example, a laser beam, scans over a recording medium in accordance with the pulse-width-modulated signal, thereby forming an image of high quality on the recording medium of a print engine. This apparatus can also be used with an analog video signal by first converting the analog video signal to a digital video signal with an analog to digital converter.
    Type: Grant
    Filed: January 24, 1991
    Date of Patent: January 24, 2006
    Assignee: Canon Inc.
    Inventors: Jean M. Riseman, John J. Smith, Alice M. d'Entremont, Craig E. Goldman, John H. Riseman