Patents by Inventor John R. Boon

John R. Boon 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).

  • Post-processing stabilization of photothermographic emulsions
    Patent number: 5196301
    Abstract: The addition of 3-substituted-5-alkylthio-1,2,4-triazoles to silver halide photothermographic emulsions improves the post-processing stability of the emulsion.
    Type: Grant
    Filed: July 30, 1990
    Date of Patent: March 23, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Sharon M. Simpson, John R. Boon, Marco Bucci, Massino Bertoldi, Cristina Soncini, Kumars Sakizadeh
  • Post processing stabilized photothermographic emulsions
    Patent number: 5149620
    Abstract: The addition of certain 5-mercapto-1,2,4-triazoles to silver halide photothermographic emulsions improves the post-processing image stability of those emulsions.
    Type: Grant
    Filed: July 30, 1990
    Date of Patent: September 22, 1992
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Sahron M. Simpson, John R. Boon, Marco Bucci, Massimo Bertoldi, Cristina Soncini, Kumars Sakizadeh
  • Supersensitization of silver halide emulsions
    Patent number: 5013622
    Abstract: Supersensitization of silver halide emulsions is effected by the addition of a metal chelating agent after chemical sensitization or a combination of phenylmercaptotetrazoles and a metal chelating agent to a spectrally sensitized emulsion. The contrast of the emulsion may also be increased by the addition of this combination of materials after chemical and spectral sensitization.
    Type: Grant
    Filed: December 12, 1986
    Date of Patent: May 7, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Sharon M. Simpson, John R. Boon
  • Color photographic element containing three silver halide layers sensitive to infrared
    Patent number: 4619892
    Abstract: Full color photographic images are produced by exposure of a radiation-sensitive element comprising at least three silver halide emulsion layers. At least two silver halide emulsion layers are sensitized to infrared radiation. Selectively absorptive filter layers and/or differential sensitivities between emulsion layers are used to prevent exposure of other layers to radiation used to expose a single layer.
    Type: Grant
    Filed: November 7, 1985
    Date of Patent: October 28, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Sharon M. Simpson, John M. McQuade, John R. Boon
  • Pneumatically operated pipe crawler
    Patent number: 4372161
    Abstract: A pneumatically operated pipe crawler for transporting inspection equipment along the interior of a pipe comprises an elongate cylindrical tube of flexible resilient material, such as latex rubber, the tube being partitioned by longitudinally spaced plugs which are hermetically sealed to the wall of the tube thus defining three longitudinally separated chambers. The inspection equipment is mounted at the leading end of the crawler. To advance the crawler along the pipe, air or other gas is supplied to the chambers and exhausted therefrom in repeated cyclic sequence for sequentially expanding the chamber wall portions into clamping relation with the pipe, each wall portion recovering to its axial length upon deflation of the chamber, thereby to propel the tube step by step along the pipe.
    Type: Grant
    Filed: May 4, 1981
    Date of Patent: February 8, 1983
    Inventors: Eric G. de Buda, John R. Boon, Michael P. Dolbey
  • Photographic contrast enhancers
    Patent number: 4363873
    Abstract: As silver is the most expensive individual component in photographic film, it is desirable to reduce the quantities of silver in such materials. The addition of a certain class of phenolic derivatives has been found to enhance the contrast generated by dyes in color photographic emulsions. Emulsions containing these phenolic compounds can use less silver and produce the same optical density as emulsions with higher silver concentrations.
    Type: Grant
    Filed: September 14, 1981
    Date of Patent: December 14, 1982
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John R. Boon, Gregory J. Wagner