Patents Assigned to Hoechst Celanses Corp.
  • Polarization dependent writing and erasing process for organic optical media
    Patent number: 5251197
    Abstract: A writing/erasing method for use in connection with homotropic organic optical media is disclosed and claimed. The method includes writing on a thin film with light of a first linear polarity to induce birefringence along the direction of an optical axis of the film's initial state followed by erasing the film with light of a second linear polarity. The first and second linear polarities are angularly offset with respect to one another, preferably by 90 degrees.
    Type: Grant
    Filed: February 13, 1992
    Date of Patent: October 5, 1993
    Assignee: Hoechst Celanses Corp.
    Inventors: Hartmann F. Leube, Leroy McKenzie
  • Process for making polyarylate compositions having improved properties
    Patent number: 5109101
    Abstract: Thermoplastic polyarylate compositions suitable for molding are formed from isophthalic acid, terephthalic acid or mixtures thereof, a bisphenolic compound such as bisphenol A and from about 5 to 10 mole % relative to the monomeric charge of 2-hydroxy-6-naphthoic acid.
    Type: Grant
    Filed: January 23, 1991
    Date of Patent: April 28, 1992
    Assignee: Hoechst Celanse Corp.
    Inventors: Balaram Gupta, Gordon W. Calundann