Patents by Inventor Franz Specht

Franz Specht 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).

  • Method of reprocessing cured polysulfide and/or mercaptan elastomers
    Patent number: 5371111
    Abstract: The method of reprocessing cured polysulfide and polymercaptan elastomers includes reacting an 0.5 to 400 percent-by-weight portion of a polysulfide and/or polymercaptan elastomer with at least one liquid di- or polymercapto compound, with a plasticizer and with a filling material and with an binding agent to form a polysulfide sealing material-base component. Then a polysulfide sealing material curing agent is added to the polysulfide sealing material-base component to form the reprocessed cured polysulfide sealing material with a Shore-A-Hardeness>40 and a tensile strength>1 MPa.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: December 6, 1994
    Assignee: Metallgesellschaft Aktiengesellschaft
    Inventors: Gerfried Unger, Ralph-Josef Hecktor, Reiner Theobald, Franz Specht