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. 28, 1992
Filed:
Feb. 13, 1991
Thomas C Shutt, Denver, CO (US);
Vista Ferrous Sulfate, Ltd., Denver, CO (US);
Abstract
A pelletized ferrous sulfate monohydrate (FeSO.sub.4 .multidot.H.sub.2 O) product and method for the manufacture thereof. Hard, spherical ferrous sulfate monohydrate pellets are manufactured by combining ferrous sulfate monohydrate powder with an aqueous solution of ammonium sulfate (NH.sub.4).sub.2 SO.sub.4 having a preferred concentration of about 1-40% by weight ammonium sulfate. Mixture of these components occurs in a conventional pelletizing apparatus (e.g. a disc pelletizer) which produces individual pellets from the components. The pellets are then heated in order to remove excess water therefrom. The foregoing process enables durable pellets to be made without substantial hydration of the ferrous sulfate monohydrate. The pellets are spherical, have a size of about -6+20 U.S. standard mesh, and have not less than about 25% by weight soluble Fe.