Patents by Inventor Patricia Dwyer-Hallquist

Patricia Dwyer-Hallquist 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).

  • Fluoran derivatives and their use in recording materials
    Patent number: 4910183
    Abstract: The invention relates to novel fluoran compounds of the general formula ##STR1## wherein R.sub.1 and R.sub.2, each independently of the other, are lower alkyl;A is ##STR2## or a pyrrolidinyl, piperidino, morpholino or piperazino radical; and R.sub.3 and R.sub.4, each independently of the other, are C.sub.1 -C.sub.12 alkyl, cycloalkyl, phenyl or phenyl substituted by lower alkyl or lower alkoxy.These compounds are particularly suitable for use as color formers in pressure-sensitive or heat-sensitive recording materials.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: March 20, 1990
    Assignee: Appleton Papers Inc.
    Inventors: Patricia Dwyer-Hallquist, William J. Becker, Robert E. Miller, Kenneth D. Glanz
  • Fluoran derivatives and their use in recording materials
    Patent number: 4837210
    Abstract: The invention relates to novel fluoran compounds of the general formula ##STR1## wherein R.sub.1 and R.sub.2, each independently of the other, are lower alkyl;A is ##STR2## or a pyrrolidinyl, piperidino, morpholino or piperazino radical; and R.sub.3 and R.sub.4, each independently of the other, are C.sub.1 -C.sub.12 alkyl, cycloalkyl, phenyl or phenyl substituted by lower alkyl or lower alkoxy.These compounds are particularly suitable for use as color formers in pressure-sensitive or heat-sensitive recording materials.
    Type: Grant
    Filed: January 27, 1987
    Date of Patent: June 6, 1989
    Assignee: Appleton Papers Inc.
    Inventors: Patricia Dwyer-Hallquist, William J. Becker, Robert E. Miller, Kenneth D. Glanz