The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 1990
Filed:
Jun. 22, 1989
Robin Berg, Hudson, WI (US);
John Burwell, Eagan, MN (US);
Xerxes Corporation, Minneapolis, MN (US);
Abstract
A steel rib, designed for affixation to the interior of an underground storage tank, provides improved compression characteristics, with a reduction in cost of preparation and materials. The rib is provided with diametrically opposed vents, which may be formed by cutting a portion of a hollow, rectangular rib, rotating it 90.degree. in a direction orthogonal to the plane of the rib, and reaffixing it, so as to occlude the interior of the rib. When used to reinforce a double-walled tank, the rib allows the strengthening of the outer wall to enhance resistance to penetration and damage frequently incurred in handling, and reduce installation costs.