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:
Apr. 12, 1988
Filed:
Nov. 28, 1986
Applicant:
Inventors:
Mark J O'Hara, Mt. Prospect, IL (US);
Marion R Surgi, Evanston, IL (US);
Assignee:
Wheelabrator Environmental Systems Inc., Hampton, NH (US);
Primary Examiner:
Int. Cl.
CPC ...
F23J / ; E01C / ; C01G / ; C22B / ;
U.S. Cl.
CPC ...
423659 ; 110344 ; 75 25 ; 210912 ; 210901 ; 404129 ; 423 92 ; 423101 ;
Abstract
Solid residues arising from the burning of solid wastes have lead and cadmium sufficiently insolubilized to pass the EPA toxicity test only where the pH in the EPA test is between 7.5 and 12.0. Addition of water soluble phosphate, especially phosphoric acid, increases the immobilization of lead and cadmium so as to make such residues in compliance with the toxicity tests over a substantially broader pH range.