Patents by Inventor Hans-Egon Kunzel

Hans-Egon Kunzel 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).

  • Polyether urethanes as antistatic additives in polyamide compositions
    Patent number: 4111920
    Abstract: The present invention relates to new polyether urethanes corresponding to the general formula ##STR1## and to a process for their production. The polyether urethanes are stable for prolonged periods at temperatures of up to approximately 300.degree. C in aliphatic polyamide melts, and polyamides containing urethanes of this kind, more especially filaments and fibers of such polyamides or woven fabrics, knitted fabrics, nonwovens or pile fabrics produced from these filaments or fibers, show excellent antistatic properties.
    Type: Grant
    Filed: April 27, 1976
    Date of Patent: September 5, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans Egon Kunzel, Francis Bentz
  • Process for dyeing wet-spun aromatic polyamides in gel form
    Patent number: 4108936
    Abstract: The invention relates to a process for the production of dyed filaments from aromatic polyamides which are not modified with acid or basic groups.
    Type: Grant
    Filed: August 7, 1975
    Date of Patent: August 22, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Dieter Wolf, Ralf Miessen, Hans Egon Kunzel, Francis Bentz
  • Process for dyeing dry-spun aromatic polyamides
    Patent number: 4078889
    Abstract: The invention relates to a process for the production of dyed filaments from aromatic polyamides which are modified with acid groups.
    Type: Grant
    Filed: August 7, 1975
    Date of Patent: March 14, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Dieter Wolf, Ralf Miessen, Hans Egon Kunzel, Francis Bentz
  • Dyeing dry-spun aromatic polyamides
    Patent number: 4066396
    Abstract: The invention relates to a process for the production of dyed filaments of aromatic polyamides which have not been modified with acid or basic group.
    Type: Grant
    Filed: August 7, 1975
    Date of Patent: January 3, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Dieter Wolf, Ralf Miessen, Hans Egon Kunzel, Francis Bentz
  • Process for dyeing wet-spun aromatic polyamides in gel form
    Patent number: 4059403
    Abstract: The invention relates to a process for the production of dyed filaments from aromatic polyamides which contain acid groups.
    Type: Grant
    Filed: August 7, 1975
    Date of Patent: November 22, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Dieter Wolf, Ralf Miessen, Hans Egon Kunzel, Francis Bentz
  • High molecular weight copolyamides containing quinazoline dione units
    Patent number: 3991015
    Abstract: High molecular weight aromatic copolyamides which contain a small proportion of structural units having 2,3-(1H,3H)-quinazoline dione rings are disclosed. The presence of quinazolinedione ring units in the copolyamide results in an increased moisture absorption capacity. By using small amounts of quinazoline dione units, the good physical properties of the corresponding quinazoline dione-free polyamide are substantially retained while the moisture absorption is significantly increased. Larger amounts of quinazoline dione units than contemplated (15 mol percent and more) do not improve the moisture absorption further and adversely affect the physical properties. The copolyamides are useful in textile applications in which the improved moisture absorption serves to make clothing prepared from such textiles more comfortable.
    Type: Grant
    Filed: May 3, 1974
    Date of Patent: November 9, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Dieter Wolf, Hans Egon Kunzel, Gunther Blankenstein, Peter Kleinschmidt, Francis Bentz
  • Urethane derivatives of 2-phenyl-4(3H)-quinazolones
    Patent number: 3932409
    Abstract: 2-Phenyl-4(3H)-quinazolones bearing a urethane or thiourethane group on the 2-phenyl substituent, a second urethane or thiourethane group on the benzo ring of the quinazolone nucleus and an alkyl, cycloalkyl or phenyl group in the 3-position are prepared by treating the corresponding bis-amino compound with an acid derivative or the corresponding bis(isocyanate) or bis(isothiocyanate) with an alcohol. The compounds, of which 2-[3'-(methoxycarbonylamino)-phenyl]-3-phenyl-6-methoxycarbonylamino-4-(3H )-quinazolone is a typical embodiment, are cytostatic agents.
    Type: Grant
    Filed: June 7, 1974
    Date of Patent: January 13, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Egon Kunzel, Gerhard Dieter Wolf, Robert Bierling, Siegfried Petersen, Gunther Nischk, Dieter Steinhoff