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. 10, 1993
Filed:
May. 10, 1991
Applicant:
Inventor:
Ekart Schaarschmidt, Alfeld/Leine, DE;
Assignee:
Kunkel-Wagner GmbH & Co. KG, Alfeld/Leine, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F26B / ;
U.S. Cl.
CPC ...
34 13 ; 34 20 ; 34 26 ;
Abstract
Although an elevated process temperature is used for reprocessing used sands having high clay-like portions, the upper limit thereof is fixed such that chamottization of the sand and combustion of organic binder components do not occur. The air-gas mixture is circulated in a drier and a mechanical reprocessing step arranged downstream thereof and heated to process temperature by utilizing thermal energy obtained by branching off and burning part of the air-gas mixture from the circulation.