Patents by Inventor Hans U. Schutt

Hans U. Schutt 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).

  • Reducing stress corrosion cracking in treating gases with alkanol amines
    Patent number: 4959177
    Abstract: Stress corrosion cracking of metal weldments in the presence of an aqueous alkanol amine solution is reduced by the use of a stress corrosion inhibiting amount of a sulfiding agent selected from elemental sulfur or a sulfide ion yielding compound.
    Type: Grant
    Filed: August 16, 1989
    Date of Patent: September 25, 1990
    Assignee: Shell Oil Company
    Inventor: Hans U. Schutt
  • Method of abating corrosion in crude oil distillation units
    Patent number: 4855035
    Abstract: A process for abating corrosion caused by ammonium bisulfate in a crude column overhead transfer line operated at a temperature above the nominal aqueous dew point and in contact with a crude oil feed stream containing sulfur oxides, ammonia and a hydrochloric acid neutralizing amine, which process comprises maintaining a chloride level in said crude oil feed stream sufficient to provide a mole ratio of ammonium chloride to ammonium bisulfate of greater than about 20 in said crude column overhead transfer line.
    Type: Grant
    Filed: September 14, 1988
    Date of Patent: August 8, 1989
    Assignee: Shell Oil Company
    Inventor: Hans U. Schutt
  • Recovering oil by injecting ammoniated and nitrited seawater
    Patent number: 4620595
    Abstract: An improved floodwater for oil recovery comprises seawater which is free of undesirable proportions of bacteria, solids and oxygen, has a pH at least near, but not more than, about 9.5, and contains a minor amount of ammonium and nitrite ions and, optionally, surfactant, effective for increasing its capability of displacing oil.
    Type: Grant
    Filed: August 22, 1985
    Date of Patent: November 4, 1986
    Assignee: Shell Offshore Inc.
    Inventor: Hans U. Schutt