Oxygen Single Bonded Directly To The Nonacyclo Ring System Patents (Class 552/279)
Halogen or light metal containing or processes wherein a halogen or light metal containing is utilized (Class 552/280)
  • Polycyclic aromatic molecular semiconductors and related compositions and devices
    Patent number: 8513445
    Abstract: Disclosed are new semiconductor materials prepared from polycyclic aromatic compounds. Such compounds can exhibit high carrier mobility and/or good current modulation characteristics. In addition, the compounds of the present teachings can possess certain processing advantages such as solution-processability and/or good stability at ambient conditions.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: August 20, 2013
    Assignee: Polyera Corporation
    Inventors: Antonio Facchetti, Jordan Quinn, Yu Xia
  • Fluorescent dyes
    Patent number: 6215008
    Abstract: Fluorescent dyes which fluoresce a variety of colors are prepared from substituted isoviolanthrone and substituted isoviolanthrone by reductive alkylation with alkyl halides in the presence of zinc.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: April 10, 2001
    Assignee: Rohm and Haas Company
    Inventor: Peter J. Heffron
  • Preparation of alkoxy(iso)violanthrenediones
    Patent number: 4882095
    Abstract: A process for the preparation of bisalkoxy(iso)violanthrenediones involves alkylating the corresponding bishydroxyl compounds in an organic reaction medium with methyl benzoate as the reaction medium.The ester can easily be regenerated and is stable under the reaction conditions.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: November 21, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Reinhard Helwig, Helmut Hoch