Patents by Inventor Patrick Calas

Patrick Calas 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 for peptide synthesis starting from N- (N'-nitrosocarbamoyl) amino acids
    Patent number: 5777076
    Abstract: A method for peptide synthesis using an N-?N'-nitroso-(R')carbamoyl!amino acid as the starting compound. The compound is separated into N.sub.2, R'OH and N-carboxyanhydride of formula (II). ##STR1## The compound (II) together with an amino acid or peptide with at least one free .alpha.-amino function is introduced into a reactive medium to obtain a dipeptide or a higher peptide than the added peptide.
    Type: Grant
    Filed: May 19, 1997
    Date of Patent: July 7, 1998
    Assignee: Universite Montpellier II Sciences et Techniques du Languedoc
    Inventors: Auguste Commeyras, Helene Collet, Louis Mion, Sylvie Benefice, Patrick Calas, Henri Choukroun, Jacques Taillades, Catherine Bied
  • Functionalization of iodopolyfuorgalkanes by electrochemical reduction
    Patent number: 4830715
    Abstract: The invention relates to the preparation of functionalized derivatives from iodopolyfluoroalkanes by electrochemical reduction. This reduction is carried out in a formamide or substituted formamide solvent which may contain up to 70% (by volume) water, on a carbon cathode; for certain embodiments sulfur dioxide may also be present. This method of preparing perfluoroalkanecarboxylic acids R.sub.F COOH or perfluoroalkanesulphinic acids, R.sub.F SO.sub.2 H and alcohols of the R.sub.F C.sub.2 H.sub.4 OH type, also makes it possible to prepare new fluorinated compounds of formulae: I--(CF.sub.2).sub.p-1 --COOH and HO.sub.2 S--(CF.sub.2).sub.p-1 --COOH, in which p is an even-numbered integer which may range from 4 to 12.
    Type: Grant
    Filed: April 14, 1987
    Date of Patent: May 16, 1989
    Assignee: Atochem
    Inventors: Sylvie Benefice-Malouet, Hubert Blancou, Patrick Calas, Auguste Commeyras
  • Process for the preparation of true acetylene hydrocarbons having a perfluorinated chain
    Patent number: 4451682
    Abstract: Process for the preparation of true acetylene hydrocarbons with a perfluoro chain, characterized by dehydroiodination with an alkali metal hydroxde in an alcoholic medium of the iodohydrin ##STR1## wherein R.sub.F is a straight or branched perfluoroalkyl chain C.sub.n F.sub.2n+1 -- where n is 1 to 20, and R and R' are identical or different alkyl radicals, followed by distillation, in the presence of solid alkali metal hydroxide, of the resulting acetylenic alcohol obtained to produce a true acetylene hydrocarbon of the formula R.sub.F --C.tbd.CH. The acetylene hydrocarbons are useful for forming compounds having the ability to carry gases such as oxygen for biological purposes.
    Type: Grant
    Filed: December 2, 1982
    Date of Patent: May 29, 1984
    Assignee: PCUK Produits Chimiques Ugine Kuhlmann
    Inventors: Patrick Calas, Patrice Moreau, Auguste Commeyras
  • Process for the addition of iodoperfluoroalkanes onto ethylenic or acetylenic compounds by electrocatalysis
    Patent number: 4394225
    Abstract: The process for the addition of iodoperfluoroalkanes of the formula CF.sub.3 (CF.sub.2).sub.n I, in which n is an integer from 1 to 19, onto ethylenic or acetylenic compounds, by electrocatalysis of the mixture of reactants.
    Type: Grant
    Filed: June 29, 1981
    Date of Patent: July 19, 1983
    Assignee: Produits Chimiques Ugine Kuhlmann
    Inventors: Auguste Commeyras, Patrick Calas