Patents by Inventor Walter Rath

Walter Rath 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).

  • Moisture-curing, hot-melt polyurethane adhesive compositions
    Patent number: 5266606
    Abstract: A moisture-curing hot-melt polyurethane adhesive foam comprising isocyanate-terminated polyurethane prepolymers based on polyester or polyether and having a melting point of 40.degree. to 60.degree. C. or a glass transition point above room temperature, melted together, optionally with a nucleating agent and/or a surfactant, treated with an inert gas under pressure and released in ambient pressure is allowed to cure as a foam whereby a cure rate is achieved of at least ten times that of the composition when not foamed; extremely rapid cure rates are achieved and thick bond lines are readily obtained.
    Type: Grant
    Filed: March 29, 1993
    Date of Patent: November 30, 1993
    Assignee: Bostik, Inc.
    Inventors: Heinz G. Gilch, Walter Rath, Karsten Seitz
  • Moisture-curing, polyurethane hot-melt compositions
    Patent number: 5173538
    Abstract: A quick-setting, moisture-curing hot-melt polyurethane composition having a first polyether-based polyurethane prepolymer having a Tg above room temperature and a second polyurethane prepolymer with a Tg below room temperature, the first prepolymer being prepared from a low molecular weight polyether; preferably the second prepolymer is also polyether based and prepared from a high molecular weight polyether.
    Type: Grant
    Filed: October 17, 1989
    Date of Patent: December 22, 1992
    Assignee: Bostik, Inc.
    Inventors: Heinz G. Gilch, Walter Rath
  • Moisture-curing polyurethane-based hot-melt compositions
    Patent number: 5091444
    Abstract: A moisture-curing hot-melt composition comprising at least one isocyanate-terminated polyurethane prepolymer has improved sag-resistance while retaining high extrudability and is characterised in that the composition includes 1-17 wt %, preferably 3-6 wt %, of hydrophobic, siloxane-coated, fumed silica.Especially effective polyurethane hot-melt adhesive compositions are prepared containing 4-5 wt % of the hydrophobic, siloxane-coated fumed silica.
    Type: Grant
    Filed: February 12, 1990
    Date of Patent: February 25, 1992
    Assignee: Bostik, Inc.
    Inventors: Herbert Bauer, Heinz G. Gilch, Walter Rath, Use Schumann
  • Arrangement for testing thick-walled specimens by the ultrasonic pulse-echo method
    Patent number: 3942361
    Abstract: In an ultrasonic pulse-echo test arrangement which is particularly suited for testing heavy-walled workpieces, a plurality of transducer probes are used. Two or more transmitting transducer probes are arranged so that each probe transmits its sound beam to a respective test zone, the zones being staggered relative to each other across the thickness of the workpiece. A defect in a respective zone reflects energy to a predetermined location at the rear wall of the workpiece, such location being common to all defect responsive reflected signals. A receiving transducer probe is disposed for receiving all of the defect responsive signals reflected from the stated location.
    Type: Grant
    Filed: November 21, 1973
    Date of Patent: March 9, 1976
    Assignee: Krautkramer-Branson, Incorporated
    Inventors: Walter Rath, Rudolf Worschech