Patents by Inventor Charles E. Ebersole

Charles E. Ebersole 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).

  • Radiation-sensitive compositions containing novolak polymers made from four phenolic derivatives and an aldehyde
    Patent number: 5324620
    Abstract: A radiation-sensitive composition dissolved in a solvent comprising:(A) a photoactive compound;(B) an alkali-soluble novolak binder resin made by the condensation reaction of a mixture of phenolic monomers and phenolic dimers with an aldehyde source, said mixture of phenolic monomers and phenolic dimers comprising:(1) 2-25% by weight of said mixture being at least one monofunctinal phenolic monomer;(2) about 98-75% by weight of said mixture comprising a mixture of difunctional phenolic monomers or dimers comprising:(a) about 0.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: June 28, 1994
    Assignee: OCG Microeletronic Materials, Inc.
    Inventor: Charles E. Ebersole
  • Positive photoresists comprising a novolak resin made from 2,3-dimethyl phenol,2,3,5-trimethylphenol and aldehyde with no meta-cresol present
    Patent number: 5322757
    Abstract: Improved photoresist compositions having high resolution and high thermal resistance, produced from certain novolak polymers and diazoquinone photosensitizers. The useful novolak polymers are formed from phenolic mixtures including 2,3,5-trimethyl phenol and/or 2,3-dimethyl phenol, and optional amounts of 2,6-dimethyl phenol, o-cresol and p-cresol.
    Type: Grant
    Filed: March 24, 1993
    Date of Patent: June 21, 1994
    Assignee: OCG Microelectronic Materials, Inc.
    Inventor: Charles E. Ebersole
  • Radiation-sensitive compositions containing fully substituted novolak polymers
    Patent number: 5237037
    Abstract: A radiation-sensitive composition dissolved in a solvent comprising:(A) a photoactive compound;(B) an alkali-soluble novolak binder resin made by the condensation reaction of a mixture of phenolic monomers and phenolic dimers with an aldehyde source, said mixture of phenolic monomers and phenolic dimers comprising:(1) 2-25% by weight of said mixture being at least one monofunctional phenolic monomer;(2) about 98-75% by weight of said mixture comprising a mixture of difunctional phenolic monomers or dimers comprising:(a) about 0.
    Type: Grant
    Filed: June 12, 1991
    Date of Patent: August 17, 1993
    Assignee: OCG Microelectronic Materials, Inc.
    Inventor: Charles E. Ebersole