Patents by Inventor Thuy N. Phan

Thuy N. Phan 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).

  • Compositions stabilized with red-shifted tris-aryl-s-triazines
    Patent number: 5637706
    Abstract: Tris-aryl-s-triazines of formula I, II or III ##STR1## which contain from one one to three resorcinol derived moieties with at least one of said moieties substituted in the 5-position with a phenylalkyl group have UV spectra which are red-shifted to the near UV range and provide excellent stabilization to polymeric substrates against the deleterious effects of actinic light.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: June 10, 1997
    Assignee: Ciba-Geigy Corporation
    Inventors: Tyler A. Stevenson, Ramanathan Ravichandran, Mark S. Holt, Thuy N. Phan, Jean-Luc Birbaum, Vien V. Toan
  • Red-shifted tris-aryl-s-triazines and compositions stabilized therewith
    Patent number: 5556973
    Abstract: Tris-aryl-s-triazines which contain from one to three resorcinol derived moieties with at least one of said moieties substituted at the 5-position with an alkyl, phenylalkyl, halogen, thio or sulfonyl group have UV spectra which are red-shifted to the near UV range and provide excellent stabilization to polymeric substrates against the deleterious effects of actinic light.
    Type: Grant
    Filed: July 27, 1994
    Date of Patent: September 17, 1996
    Assignee: Ciba-Geigy Corporation
    Inventors: Tyler A. Stevenson, Ramanathan Ravichandran, Mark S. Holt, Thuy N. Phan, Jean-Luc Birbaum, Vien V. Toan
  • Red-shifted tris-aryl-s-triazines and compositions stabilized therewith
    Patent number: 5543518
    Abstract: Tris-aryl-s-triazines which contain from one to three resorcinol derived moieties with at least one of said moieties substituted at the 5-position with an alkyl, phenylalkyl, halogen, thio or sulfonyl group have UV spectra which are red-shifted to the near UV range and provide excellent stabilization to polymeric substrates against the deleterious effects of actinic light.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: August 6, 1996
    Assignee: Ciba-Geigy Corporation
    Inventors: Tyler A. Stevenson, Ramanathan Ravichandran, Mark S. Holt, Thuy N. Phan, Jean-Luc Birbaum, Vien V. Toan