Patents by Inventor Hartmut Last

Hartmut Last 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).

  • Bioactive fiber products
    Patent number: 7858111
    Abstract: The invention relates to a bioactive fiber product that, as a bioactively effective constituent, contains only one polyester fiber, which is largely or exclusively made of a polyester having links, which are condensed therewith and which contain phosphorous. The bioactive fiber products are suited for all textile products for which antibacterial, fungicidal, acaricidal and similar effects are sought.
    Type: Grant
    Filed: March 6, 2002
    Date of Patent: December 28, 2010
    Assignee: Trevira GmbH
    Inventors: Hartmut Last, Bernd A. Blech, Jörg Dahringer, Stefan Seibel
  • Bioactive fiber products
    Publication number: 20040166143
    Abstract: The invention relates to a bioactive fiber product that, as a bioactively effective constituent, contains only one polyester fiber, which is largely or exclusively made of a polyester having links, which are condensed therewith and which contain phosphorous. The bioactive fiber products are suited for all textile products for which antibacterial, fungicidal, acaricidal and similar effects are sought.
    Type: Application
    Filed: April 8, 2004
    Publication date: August 26, 2004
    Inventors: Hartmut Last, Bernd A Blech, Jorg Dahringer, Stefan Seibel
  • Process for separating dimethyl isophthalate and dimethyl orthophthalate from their mixture with dimethyl terephthalate
    Patent number: 4683034
    Abstract: The invention relates to a process for separating dimethyl isophthalate (DMI) and dimethyl orthophthalate (DMO) and other by-products from their mixture with dimethyl terephthalate (DMT), formed in the oxidation of p-xylene followed by esterification with methanol, by crystallization from the melt.Initially, the esterification product is here distilled once or several times. The DMT-rich fraction obtained is then subjected wholly or partially to one or several crystallizations from the melt, and the DMI-DMO fraction thus obtained is at least partially removed from the system. As an alternative, the DMT-rich fraction is first recrystallized from methanol, the methanol is then evaporated from the mother liquor and the remaining residue is subjected to one or several crystallizations from the melt. The DMI-DMO fraction thus obtained is again at least partially removed from the system.
    Type: Grant
    Filed: August 16, 1985
    Date of Patent: July 28, 1987
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Rolf Bader, Hartmut Last, Manfred Mayer, Siegbert Rittner, Edgar Wetzel