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, 1994
Filed:
Apr. 27, 1992
Gordon W Fenn, Dundee, MI (US);
Frontier, Inc., Ann Arbor, MI (US);
Abstract
The heat exchange structure comprises a series of tubes arranged in a circular pattern extending between upper and lower manifolds. Water flows from the upper manifold through these tubes to the lower manifold. Annular fins are stacked on these tubes. A larger tube is arranged concentric with each of the smaller diameter water-carrying tubes and hot gaseous products of combustion flow through these larger tubes in counterflow to the water flow through the water tubes. The fins have through-holes allowing the hot gases to pass through the stacks of fins. The combustion chamber is located centrally just above the lower manifold. Ambient air is introduced via perforations in the side wall of the casing near the upper manifold and flows downwardly past the heat exchange structure for recuperative effect before reaching the combustion chamber.