Patents by Inventor Geoffrey Walsh Meadows

Geoffrey Walsh Meadows 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).

  • Purification of anhydrous hydrogen fluoride
    Patent number: 4083941
    Abstract: A process for preparing very high purity anhydrous hydrogen fluoride by contacting anhydrous hydrogen fluoride with at least 2.3% by weight of persulfuric acid based on the anhydrous hydrogen fluoride or at least 0.7% by weight of hydrogen peroxide based on the anhydrous hydrogen fluoride at ambient temperature and either at least 0.6% by weight of methanol based on the anhydrous hydrogen fluoride or at least one mole of sulfuric acid per mole of hydrogen peroxide at a temperature of from 0.degree. to 75.degree. C and distilling the resulting mixture to recover very high purity anhydrous hydrogen fluoride.
    Type: Grant
    Filed: April 18, 1977
    Date of Patent: April 11, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Madhusudan Dattatraya Jayawant, Geoffrey Walsh Meadows
  • Preparation of hydrogen fluoride with low levels of arsenic, iron and sulfite
    Patent number: 4032621
    Abstract: A process for preparing pure anhydrous hydrogen fluoride with decreased levels of arsenic, iron and sulfite by treating anhydrous hydrogen fluoride sequentially with an oxidizing agent, and then a heavy metal free reducing agent, distilling the resulting mixture and recovering the pure hydrogen fluoride.
    Type: Grant
    Filed: November 24, 1975
    Date of Patent: June 28, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Geoffrey Walsh Meadows