Patents by Inventor Lutz Uwe Lehmann

Lutz Uwe Lehmann 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).

  • Dithienopyrrole-containing copolymers
    Publication number: 20080262183
    Abstract: Dithienopyrrole-containing copolymers, and organic semiconductors formed therefrom, used as p-type and donor compounds in semiconductors for organic photovoltaic (OPV) applications, such as solar cells or transistors, such as organic field effect transistors (OFET). Organic semiconductors formed herein have a low bandgap and high absorbance, increasing the efficiency of a transistor or a solar cell. Such dithienopyrrole-containing copolymers also have excellent hole-conductivity which may be even further improved through oxidation.
    Type: Application
    Filed: April 17, 2007
    Publication date: October 23, 2008
    Inventor: Lutz Uwe Lehmann
  • Dyestuffs containing indolenecyanine disulphonic acid derivatives
    Patent number: 6441191
    Abstract: The present invention relates to the use of dye-stuffs of the general formula I in which R1, R2 and R3 and M⊕ are as defined in claim 1, as infrared-absorbing agents in hydrophilic colloidal layers, for example in recording materials or for detection purposes, recording materials, for example photographic recording materials, which comprise such dyestuffs in hydrophilic colloidal layers, and new dyestuffs of the general formula I.
    Type: Grant
    Filed: March 12, 1998
    Date of Patent: August 27, 2002
    Assignee: Honeywell International Inc.
    Inventors: Ralph Lonsky, Lutz Uwe Lehmann
  • Use of indolenine-cyaninedisulphonic acid derivatives
    Patent number: 6261753
    Abstract: The present invention relates to the use of dye-stuffs of the general formula I in which R1, R2 and R3 and M• are as defined in claim 1, as infra-red-absorbing agents in hydrophilic colloidal layers, for example in recording materials or for detection purposes, recording materials, for example photographic recording materials, which comprise such dyestuffs in hydrophilic colloidal layers, and new dyestuffs of the general formula I.
    Type: Grant
    Filed: March 12, 1998
    Date of Patent: July 17, 2001
    Assignee: Riedel-De Haen Aktiengesellschaft
    Inventors: Ralph Lonsky, Lutz Uwe Lehmann
  • Use of indoleine-cyaninedisulphonic acid derivatives
    Patent number: 5747233
    Abstract: The present invention relates to the use of dyestuffs of the general formula I ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 and M.sup..sym. are as defined in claim 1, as infrared-absorbing agents in hydrophilic colloidal layers, for example in recording materials or for detection purposes, recording materials, for example photographic recording materials, which comprise such dyestuffs in hydrophilic colloidal layers, and new dyestuffs of the general formula I.
    Type: Grant
    Filed: May 15, 1997
    Date of Patent: May 5, 1998
    Assignee: Riedel-De Haen Aktiengesellschaft
    Inventors: Ralph Lonsky, Lutz Uwe Lehmann