Patents by Inventor Rudolf E. Svadlenak

Rudolf E. Svadlenak 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).

  • Non-halogenated aqueous cleaning systems
    Patent number: 5221362
    Abstract: Non-halogenated aqueous degreasing compositions-useful for removing inks and cleaning printed circuit boards comprising a three-component mixture of (1) an organic acid consisting essentially of an alkanoic acid, preferably a hydroxy-substituted alkanoic acid, (2) a straight chain alkanol having at least four carbon atoms or an alkyl ester derived from an unsubstituted or substituted alkanoic acid and a straight chain alkanol having at least four carbon atoms and (3) water.
    Type: Grant
    Filed: August 23, 1991
    Date of Patent: June 22, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Earnest W. Porta, James M. Ridgway, Jr., Rudolf E. Svadlenak
  • Process for the isolation of alkyl glyoxylate
    Patent number: 5217582
    Abstract: A process is provided for separating high purity alkyl glycolate from a gaseous reaction mixture resulting from the catalyzed gas phase oxidation of alkyl glycolate. A hot solvent which is immiscible with water but selectively dissolves alkyl glycolate and alkyl glyoxylate is brought in contact with the gaseous reaction mixture, and water and alcohol vapors are removed from the hot solvent. The alkyl glyoxylate is removed from the solution by a first distillation and the alkyl glycolate and solvent are then separated in a second distillation.
    Type: Grant
    Filed: February 7, 1992
    Date of Patent: June 8, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George E. Heinsohn, John F. Kook, John R. Kosak, Rudolf E. Svadlenak
  • Stabilization of choline and its derivatives against discoloration
    Patent number: 5209858
    Abstract: The stabilization of aqueous or alkanolic solutions of choline and derivative of choline against discoloration on aging by the addition of an unsubstituted hydroxylamine salt to the choline solutions at levels of less than 1 percent.
    Type: Grant
    Filed: February 6, 1991
    Date of Patent: May 11, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George E. Heinsohn, Rudolf E. Svadlenak
  • Process for the purification of aldehydes
    Patent number: 4952291
    Abstract: An aldehyde in a mixture containing hemiacetals and hydrates of the aldehyde is purified by treating the mixture with an effective amount of microwave radiation to decompose the hemiacetals and hydrates. Liberated water and/or alcohol is immediately removed with an adsorbent.
    Type: Grant
    Filed: December 6, 1989
    Date of Patent: August 28, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Neville E. Drysdale, Frederick W. Mader, Rudolf E. Svadlenak