Patents by Inventor Randal L. Campbell

Randal L. Campbell 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).

  • Positive photoresist compositions having enhanced processing time
    Patent number: 7090958
    Abstract: Novel compositions comprising photoactive polymers comprising a dinitrobenzyl group in conjunction with a photoacid generator are disclosed. In one embodiment, the photoacid generator is a diazide and/or a sulfonyl aceto carbonyl compound. The photoacid generators are typically used in amounts of 10 weight percent or less. The compositions find particular application in storage stable, pH stable, and water stable positive photoresist compositions. Such compositions demonstrate reduced process time as compared with similar compositions lacking the photoacid generator. Methods for using these compositions are also disclosed.
    Type: Grant
    Filed: April 11, 2003
    Date of Patent: August 15, 2006
    Assignee: PPG Industries Ohio, Inc.
    Inventors: James E. Jones, Randal L. Campbell, David A. Diehl, Ljiljana Maksimovic, Ronald R. Ambrose, Gerald W. Gruber
  • Positive photoresist compositions having enhanced processing time
    Publication number: 20040202953
    Abstract: Novel compositions comprising photoactive polymers comprising a dinitrobenzyl group in conjunction with a photoacid generator are disclosed. In one embodiment, the photoacid generator is a diazide and/or a sulfonyl aceto carbonyl compound. The photoacid generators are typically used in amounts of 10 weight percent or less. The compositions find particular application in storage stable, pH stable, and water stable positive photoresist compositions. Such compositions demonstrate reduced process time as compared with similar compositions lacking the photoacid generator. Methods for using these compositions are also disclosed.
    Type: Application
    Filed: April 11, 2003
    Publication date: October 14, 2004
    Inventors: James E. Jones, Randal L. Campbell, David A. Diehl, Ljiljana Maksimovic, Ronald R. Ambrose, Gerald W. Gruber
  • Method of treating photoresists using electrodeless UV lamps
    Publication number: 20030211426
    Abstract: Methods for treating a photoresist by exposure to light from an electrodeless UV bulb are disclosed. The methods are applicable to both positive and negative photoresists. In the case of positive photoresists, use of electrodeless UV lamps significantly reduces the UV exposure time. Methods for making circuit boards and apparatus for making circuit boards are also disclosed.
    Type: Application
    Filed: May 14, 2003
    Publication date: November 13, 2003
    Inventors: Randal L. Campbell, James E. Jones
  • Method of treating photoresists using electrodeless UV lamps
    Patent number: 6620574
    Abstract: Methods for treating a photoresist by exposure to light from an electrodeless UV bulb are disclosed. The methods are applicable to both positive and negative photoresists. In the case of positive photoresists, use of electrodeless UV lamps significantly reduces the UV exposure time. Methods for making circuit boards and apparatus for making circuit boards are also disclosed.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: September 16, 2003
    Assignee: PPG Industries Ohio, Inc.
    Inventors: Randal L. Campbell, James E. Jones
  • Method of treating photoresists using electrodeless UV lamps
    Publication number: 20030129537
    Abstract: Methods for treating a photoresist by exposure to light from an electrodeless UV bulb are disclosed. The methods are applicable to both positive and negative photoresists. In the case of positive photoresists, use of electrodeless UV lamps significantly reduces the UV exposure time. Methods for making circuit boards and apparatus for making circuit boards are also disclosed.
    Type: Application
    Filed: September 12, 2001
    Publication date: July 10, 2003
    Inventors: Randal L. Campbell, James E. Jones