Patents by Inventor John A. Frank

John A. Frank 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: 5153618
    Abstract: An ionographic imaging member containing a conductive layer and a uniform and continuous dielectric imaging layer free of voids, the imaging layer having a dielectric constant of from about 1.5 to about 40 and a thickness of at least about 45 micrometers, the thickness divided by the dielectric constant having a value of from about 30 to about 60 micrometers. This member may be used in an ionographic imaging process.
    Type: Grant
    Filed: August 13, 1991
    Date of Patent: October 6, 1992
    Assignee: Xerox Corporation
    Inventors: John A. Frank, Joseph Mammino, Dennis A. Abramsohn, Donald S. Sypula, Jerome P. Chasko, William L. Gary, Deborah J. Nichol-Landry, Fred W. Schmidlin, Dasarao K. Murti, Brian E. Springett
  • Patent number: 5138349
    Abstract: A printer member adapted to be used in an ion printing device having a conductive coating positioned on a portion of the marking head near the charge receiver. The conductive coating is electrically connected to the housing in order to substantially equalize the voltage potential of the housing and marking member. The above arrangement enables the device to be set at a single operating state that would allow the device to operate very near its breakdown threshold at all humidity levels.
    Type: Grant
    Filed: September 20, 1990
    Date of Patent: August 11, 1992
    Assignee: Xerox Corporation
    Inventors: Brendan C. Casey, John A. Frank, William L. Gary
  • Patent number: 5081475
    Abstract: A device for the adjustment of the digital data stream that drives the modulators in an ionographic printing device. In particular, the device stretches strings of black image pixels to produce wider vertical lines and other fine details that may have been adversely affected due to modulator crosstalk. Moreover, the present invention is implemented in such a manner, so as to enable the end user to selectively define the magnitude of stretching to be applied to the strings of black pixels.
    Type: Grant
    Filed: July 30, 1990
    Date of Patent: January 14, 1992
    Assignee: Xerox Corporation
    Inventors: John A. Frank, Brendan C. Casey, Robert P. Robideau
  • Patent number: 5073434
    Abstract: An ionographic imaging member containing a conductive layer and a uniform and continuous dielectric imaging layer free of voids, the imaging layer having a dielectric constant of from about 1.5 to about 40 and a thickness of at least about 45 micrometers, the thickness divided by the dielectric constant having a value of from about 30 to about 60 micrometers. This member may be used in an ionographic imaging process.
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: December 17, 1991
    Assignee: Xerox Corporation
    Inventors: John A. Frank, Joseph Mammino, Dennis A. Abramsohm, Donald S. Sypula, Jerome P. Chasko, William L. Gary, Deborah J. Nichol-Landry, Fred W. Schmidlin, Dasarao K. Murti, Brian E. Springett
  • Patent number: 5039598
    Abstract: Processes for preparing ionographic imaging member including providing a flexible, shrinkable tube containing a dielectric film forming polymer having a T.sub.g of at least about -40.degree. C., charge decay of less than about 2 nonocoulombs per cm.sup.2 per second and elastic memory, providing a cylindrical support member having an outer diameter that is less than the inner diameter of the flexible tube, applying a continuous coating on the interior of the tube or on the exterior of the cylindrical support member, the coating comprising a material selected from the group consisting of an electrically conductive material, an adhesive material and mixture thereof, shrinking the tube to bring the inner surface of the tube and the outer surface of the cylindrical support member into intimate physical contact with the continuous coating. This imaging member may be employed in an ionographic imaging process.
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: August 13, 1991
    Assignee: Xerox Corporation
    Inventors: Dennis A. Abramsohn, John A. Frank, Joseph Mammino, Brendan C. Casey, Donald S. Sypula
  • Patent number: 4812860
    Abstract: A heater for an ionographic marking apparatus including a housing, means for generating a supply of marking ions within the housing, means for transporting the marking ions through and out of the housing, and an array of modulation electrodes upon a substrate for controlling the transport of ions out of the housing, the modulation electrodes being spaced from one another by electrically insulating regions. The heater is associated with the array for raising the temperature of the electrically insulating regions so as to prevent the condensation of moisture thereon.
    Type: Grant
    Filed: May 4, 1988
    Date of Patent: March 14, 1989
    Assignee: Xerox Corporation
    Inventors: Nicholas K. Sheridan, Richard G. Stearns, John A. Frank, Brendan Casey, William Gary
  • Patent number: 4330377
    Abstract: Tin ions are provided to the electrolyte-containing cathode compartment of an electrolysis cell in which the anode and cathode compartments are separated by a cationic permselective membrane. The anolyte is generally a mineral acid or tin salt thereof. Operation of the electrolysis cell results in the deposition of tin in a purified form onto the catode which may be recovered as tin metal. Alternatively, the deposited tin and cathode compartment can be washed and the cathode compartment filled with an acid solution. Reversal of the current polarity results in the production of tin salts which may be recovered. Tin salts may also be concurrently anodically produced while tin metal is cathodically electrowinned.
    Type: Grant
    Filed: July 10, 1980
    Date of Patent: May 18, 1982
    Assignee: Vulcan Materials Company
    Inventor: John A. Franks, Jr.
  • Patent number: 4291009
    Abstract: Tin salts, such as, for example, alkali metal stannates, are produced by contacting at elevated temperatures an aqueous alkaline solution, such as for example, alkali metal hydroxide solutions, with a tin-containing material in the presence of a reaction promotor comprising the combination of activated carbon and an oxygen supplying agent.
    Type: Grant
    Filed: June 19, 1980
    Date of Patent: September 22, 1981
    Assignee: Vulcan Materials Company
    Inventor: John A. Franks, Jr.
  • Patent number: 4234403
    Abstract: A mixture of stannic and chloride ions having a chloride to tin ratio of at least 4:1 (e.g., stannic anion complexes) is provided to the cathode compartment of an electrolysis cell in which the anode and cathode compartments are separated by a cationic permselective membrane. The anolyte is a mineral acid or tin salt thereof. Operation of the electrolysis cell results in the production of stannous anion complexes which may be treated to obtain stannous chloride products.
    Type: Grant
    Filed: June 15, 1979
    Date of Patent: November 18, 1980
    Assignee: Vulcan Materials Company
    Inventor: John A. Franks, Jr.