Patents by Inventor Hermann Sitt

Hermann Sitt 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).

  • Environmentally durable lightning strike protection materials for composite structures
    Patent number: 5225265
    Abstract: Composite assemblies prepared from thermosettable matrix resin-impregnated fiber-reinforced prepregs, conductive metal screens, and film adhesives are provided which do not develop microcracks after extensive thermal cycling. The composite assemblies are particularly useful in the manufacture of vehicles in the transportation industry, especially aircraft.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: July 6, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Jill M. Prandy, Hermann Sitt
  • Structures exhibiting improved transmission of ultrahigh frequency electromagnetic radiation and structural materials which allow their construction
    Patent number: 5167870
    Abstract: Radomes having increased transparency and reduced reflectivity and refractivity to radar waves may be prepared or repaired utilizing heat-curable resin-containing structural materials in which the heat-curable resin contains greater than about 70 weight percent of cyanate functional monomers. The structural materials take the form of matrix resin impregnated prepegs and composites, film adhesives, paste adhesives, syntactic foams, and expandable foams, and may be used to prepare numerous useful structural features including honeycomb materials and leading edge radomes containing syntactic foams.
    Type: Grant
    Filed: July 19, 1990
    Date of Patent: December 1, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Jack D. Boyd, Hermann Sitt, Hong-Son Ryang, Theodore F. Biermann
  • Structures exhibiting improved transmission of ultrahigh frequency electromagnetic radiation and structural materials which allow their construction
    Patent number: 5134421
    Abstract: Radomes having increased transparency and reduced reflectivity and refractivity to radar waves may be prepared or repaired utilizing heat-curable resin-containing structural materials in which the heat-curable resin contains greater than about 70 weight percent of cyanate functional monomers. The structural materials take the form of matrix resin impregnated prepegs and composites, film adhesives, paste adhesives, syntactic foams, and expandable foams, and may be used to prepare numerous useful structural features including honeycomb materials and leading edge radomes containing syntactic foams. The heat-curable resins further facilitate the preparation of low observable structures.
    Type: Grant
    Filed: September 10, 1990
    Date of Patent: July 28, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Jack D. Boyd, Hermann Sitt, Hong-Son Ryang, Theodore F. Biermann
  • Structures exhibiting improved transmission of ultrahigh frequency electromagnetic radiation and structural materials which allow their construction
    Patent number: 4956393
    Abstract: Radomes having increased transparency and reduced reflectivity and refractivity to radar waves may be prepared or repaired utilizing heat-curable resin-containing structural materials in which the heat-curable resin contains greater than about 70 weight percent of cyanate functional monomers. The structural materials take the form of matrix resin impregnated prepegs and composites, film adhesives, paste adhesives, syntactic foams, and expandable foams, and may be used to prepare numerous useful structural features including honeycomb materials and leading edge radomes containing syntactic foams.
    Type: Grant
    Filed: August 29, 1988
    Date of Patent: September 11, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Jack D. Boyd, Hermann Sitt, Hong-Son Ryang, Theodore F. Biermann