Patents by Inventor Jean P. Schirmann

Jean P. Schirmann 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).

  • Adiabatic Hydrofluorination of hydrochlorofluorocarbons
    Patent number: 5600038
    Abstract: Process for adiabatically hydrofluorinating hydrochlorocarbons and hydrochlorofluorocarbons in the gaseous phase in the presence of a catalyst that is active at the initial reaction temperature and remains highly selective at the maximum reaction temperature, e.g., a Cr catalyst. The molar ratio of HF to starting compound is at least about 2.5:1. The initial reaction temperature is selected such that the HF in the feed is partially associated but not completely (HF).sub.6. The catalyst may be unsupported or supported.
    Type: Grant
    Filed: March 24, 1995
    Date of Patent: February 4, 1997
    Assignee: Elf Atochem North America, Inc.
    Inventors: John A. Wismer, Maher Y. Elsheikh, Michael S. Bolmer, Jean P. Schirmann
  • Process for the preparation of concentrated solutions of hydrazine hydrate
    Patent number: 4725421
    Abstract: A continuous method for the preparation of concentrated aqueous solutions of hydrazine hydrate from ketazines which are slightly soluble in water, by hydrolysis and distillation under pressure using a distillation column. The column is fed with the ketazine or ketazines and water wherein the water/azine molar ratio ranges between 5 and 7.75.
    Type: Grant
    Filed: July 26, 1985
    Date of Patent: February 16, 1988
    Assignee: Atochem
    Inventors: Jean P. Schirmann, Jean Combroux, Serge Y. Delavarenne
  • Preparation of concentrated aqueous solution of hydrazine hydrate
    Patent number: 4724133
    Abstract: A continuous method for the preparation of concentrated aqueous solutions of hydrazine hydrate from concentrated aqueous solutions of acetone azine by a hydrolysis reaction and distillation under pressure in a column. The concentration of the aqueous solution of acetone azine is such that the water/azine molar ratio ranges between 3 and 7.
    Type: Grant
    Filed: July 26, 1985
    Date of Patent: February 9, 1988
    Assignee: Atochem
    Inventors: Jean P. Schirmann, Jean Combroux, Serge Y. Delavarenne