Patents by Inventor Johannes Adrianus Cornelis Van Ooyen

Johannes Adrianus Cornelis Van Ooyen 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).

  • Well servicing fluids
    Patent number: 6017856
    Abstract: The invention relates to an aqueous well servicing fluid comprising in solution a potassium formate characterized in that said solution contains in addition potassium citrate. The potassium citrate, which can be added as a solid to a potassium formate solution, enhances the density of said fluid and minimizes any risk of caking which may be experienced if solid potassium formate is used.
    Type: Grant
    Filed: December 4, 1998
    Date of Patent: January 25, 2000
    Assignee: Verdugt B.V.
    Inventor: Johannes Adrianus Cornelis Van Ooyen