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. 09, 1994
Filed:
Feb. 16, 1993
Applicant:
Inventor:
Norman B Rainer, Richmond, VA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08L / ; C08J / ; C08G / ; B01D / ;
U.S. Cl.
CPC ...
524 30 ; 521 25 ; 521 30 ; 527312 ; 527313 ; 210670 ; 210688 ; 210679 ; 210681 ; 210683 ; 210690 ; 210691 ; 210711 ; 4284735 ; 528341 ; 528342 ;
Abstract
Metal cations absorbed within a hydrogel chelation polymer are insolubilized for safe disposal by treating the polymer with a precipitative anion such as carbonate, aluminate, hydroxide, phosphate, silicate, or sulfide. Further insolubilization of the metal cations may be achieved by subsequent treatment of the polymer with a water-dilutable prepolymer composition such as phenol-formaldehyde resin, then heating to cause cross-linking of the prepolymer. The hydrogel chelation polymer, containing metal sulfide formed by virtue of the insolubilization process, is useful in abstracting from water metals whose sulfides are less soluble than the metal sulfide initially within the polymer.