Patents by Inventor Charles Uriah Pittman, Jr.

Charles Uriah Pittman, Jr. 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).

  • Photoactive compounds for use with narrow wavelength band ultraviolet (UV) curing systems
    Patent number: 6140385
    Abstract: Novel substituted diaryl ketones, photopolymerization compositions including the compounds, and methods using the same are disclosed. Polymerization of compositions which include the compounds of the invention may be activated by irradiating the composition with ultraviolet light using conventional techniques and radiation sources to give greatly improved cure speeds. The compounds of the invention also show a significantly elevated level of reactivity at a narrow wavelength band, with a peak emission wavelength at or near 308 nm. Because of the increased level of activity, the photoinitiator can be used in considerably lower amounts.
    Type: Grant
    Filed: September 30, 1998
    Date of Patent: October 31, 2000
    Assignee: First Chemical Corporation
    Inventors: Joseph Stanton Bowers, Jr., Rajamani Nagarajan, Charles Uriah Pittman, Jr., E. Sonny Jonsson
  • Liquid thioxanthone photoinitiators
    Patent number: 6025408
    Abstract: Novel thioxanthone derivatives and mixtures thereof and methods of making and using the same are disclosed. The novel thioxanthone derivatives can be liquid at room temperature and display highly active photoinitiation and photopolymerization properties.
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: February 15, 2000
    Assignee: First Chemical Corporation
    Inventors: Eric Lee Williams, Ruicheng Ran, Charles Uriah Pittman, Jr., Joseph Stanton Bowers, Jr., August John Muller