Inventor

John F. Kennedy

Document Type

Patent

Patent Number

US Patent 4,790,355

Patent agency

United States Patent and Trademark Office

Publication Date

12-13-1988

Assignee

University of Iowa Research Foundation (Iowa City, IA, US)

Application Number

07/029,522

Date Filed

1987-03-23

Total Pages

7 pages

Abstract

A vertical dropshaft having internal helicoidal ramps for dissipating the energy of liquid passing through the dropshaft and for exhausting air entrained by the falling liquid up the center of the dropshaft.

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URL

https://ir.uiowa.edu/patents/61