Patents by Inventor Stephen Roggendorff

Stephen Roggendorff 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).

  • Methods of manufacturing large tubular columns
    Patent number: 4371108
    Abstract: The invention relates to a method of manufacturing large tubular columns, for example, for use as the legs of off-shore well-drilling apparatus. Each column is manufactured by initially fitting stiffening ring segments to a plurality of shell segments and then welding the shell segments together to form a column section. After additional ring segments have been fitted across the joints between the shell segments, a series of tubular sections are welded together to form the column.
    Type: Grant
    Filed: September 19, 1980
    Date of Patent: February 1, 1983
    Inventors: Stephen Roggendorff, Cuthbert J. Walker