Patents by Inventor Thomas A. Lindquist

Thomas A. Lindquist 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).

  • Method for making steel/concrete tanks
    Patent number: 4931235
    Abstract: A method for making a steel/concrete tank is provided. A steel interior tank is pressurized during or after pouring of a concrete outer tank around a steel inner tank. Pressurization is commenced before the concrete has set, and is maintained until substantial setting of the concrete. The resulting structure is less susceptible than previous structures to cracking of the exterior concrete upon pressure-testing of the structure for leaks.
    Type: Grant
    Filed: March 6, 1989
    Date of Patent: June 5, 1990
    Assignee: Convault, Inc.
    Inventors: Thomas A. Lindquist, Ralph Bambacigno