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:
Nov. 22, 1988
Filed:
Dec. 14, 1987
Jose A Lopez, Martinez, CA (US);
Other;
Abstract
A folding ladder of the type made up of a pair of side rails to which rungs are pivoted at opposite ends for folding of the structure from an open mode, in which the rungs are horizontal, to a closed or folded mode in which the rails move lengthwise relative to each other as well as toward each other as the rungs pivot about their respective pivots, parallel-link fashion. The present improvement resides in the design of each rail in semi-circular section in which the open side of the C thus formed faces inwardly toward the open side of the C of the other rail, whereby, in the closed mode, the two rails form a cylindrical shell within which the rungs are housed or confined, leading to a compact package that is easily carried, shipped, etc.