Patents by Inventor Robert E. A. Dear

Robert E. A. Dear 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).

  • Patent number: 4171415
    Abstract: This invention relates to novel acrylates, methacrylates, fumarates, maleates, citraconates, mesaconates, itaconates, and aconitates of the following structure: ##STR1## where R.sup.1, R.sup.2 are each C.sub.n H.sub.2.sbsb.n, where n is 1 to 12 and may be straight chain or branched;R.sup.3 is hydrogen or C.sub.n H.sub.2.sbsb.n+1, where n is 1 to 12 and may be straight chain or branched;R.sup.4, r.sup.5 and R.sup.6 are hydrogen, methyl, ##STR2## PROVIDED THAT AT LEAST ONE OF R.sup.4, R.sup.5, and R.sup.6 is hydrogen or methyl;R.sub.f is C.sub.p F.sub.2p+1 or C.sub.p F.sub.2p+1 OC.sub.q F.sub.2q, where p is 3 to 18 (preferably 6 to 12), q is 2 to 8, and the perfluoroalkyl constituent may be branched or straight chain.Addition polymers made from the above unsaturated esters are particularly useful for treating fabrics to make the fabric oil and water repellent.
    Type: Grant
    Filed: August 31, 1977
    Date of Patent: October 16, 1979
    Assignee: Ciba-Geigy Corporation
    Inventors: Eduard K. Kleiner, Robert E. A. Dear
  • Patent number: 4158672
    Abstract: Polyfluoroalkylthio alcohols and esters thereof are disclosed with utility as intermediates for the synthesis of fluorochemicals with low free surface energies having oil and water repellent properties. The novel alcohols and esters are obtained by a free radical catalyzed addition of polyfluoroalkylthiols to acetylenic alcohols or esters thereof. The alcohols are employed in preparation of fluorine containing polyurethanes which are useful as finishes to provide oil and water repellency to textiles and as additives to plastics to provide mold release and other desirable properties.
    Type: Grant
    Filed: December 23, 1977
    Date of Patent: June 19, 1979
    Assignee: Ciba-Geigy Corporation
    Inventors: Robert E. A. Dear, Neal O. Brace