Patents by Inventor Arthur L. Larsen

Arthur L. Larsen 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).

  • Process for inhibiting corrosion in oil production fluids
    Patent number: 5135668
    Abstract: A process for inhibiting corrosion in oil production fluids resides in adding to the oil production fluids an effective amount of betaine or ampholyte of the formulas 1 or 2 ##STR1## wherein R.sup.1 is C.sub.10 -C.sub.20 -alkyl or C.sub.10 -C.sub.20 -alkenyl, preferably C.sub.14 -C.sub.18 -aklyl or C.sub.14 -C.sub.18 -alkenyl and R.sup.2 and R.sup.3 are C.sub.1 -C.sub.4 -alkyl, preferably methyl.
    Type: Grant
    Filed: February 8, 1991
    Date of Patent: August 4, 1992
    Assignee: Scandinavian Oilfield Chemicals A/S
    Inventor: Arthur L. Larsen
  • Method and a composition for inhibiting corrosion
    Patent number: 4238349
    Abstract: Corrosion of metals in contact with liquid systems is reduced by adding to the system a small amount of a hydrazine salt of an amido carboxylic acid containing at least one hydrophobic group. The hydrazine salt of the amido carboxylic acid is preferably used in combination with an ether amine or a quaternary ammonium compound. The hydrazine salt gives a substantial reduction of both general and localized corrosion and is particularly useful for preventing corrosion in different areas of oil recovery and in petroleum industry.
    Type: Grant
    Filed: November 9, 1978
    Date of Patent: December 9, 1980
    Assignee: Malaco AG
    Inventors: Arthur L. Larsen, Soren J. Marklund, Jan Rosenblom
  • Method and a composition for inhibiting corrosion
    Patent number: 4238348
    Abstract: Corrosion of metals in contact with liquid systems is reduced by adding to the system a small amount of a carboxylic acid containing an organic hydrophobic group in combination with a sulfite or bisulfite of an amine. Preferred carboxylic acids and preferred sulfites are amino and amido carboxylic acids and preferred sulfites are those of ether amines. Combinations of the two types of compounds are particularly useful for preventing corrosion in different areas of oil recovery and in petroleum industry.
    Type: Grant
    Filed: November 9, 1978
    Date of Patent: December 9, 1980
    Assignee: Malaco AG
    Inventors: Arthur L. Larsen, Soren J. Marklund, Jan Rosenblom
  • Method and a composition for inhibiting corrosion
    Patent number: 4238350
    Abstract: Corrosion of metals in contact with liquid systems is reduced by adding to the system a small amount of an amino carboxylic acid containing at least one hydrophobic group in combination with another nitrogen containing compound. The other compound is preferably an ether amine or a quaternary ammonium compound which also contain hydrophobic groups. The combination of substances is particularly useful for preventing corrosion in different areas of oil recovery and in petroleum industry.
    Type: Grant
    Filed: November 9, 1978
    Date of Patent: December 9, 1980
    Assignee: Malaco AG
    Inventors: Arthur L. Larsen, Soren J. Marklund, Jan Rosenblom