Chemistry: fertilizers – Processes and products – Inorganic material
Reexamination Certificate
2010-02-22
2010-06-15
Langel, Wayne (Department: 1793)
Chemistry: fertilizers
Processes and products
Inorganic material
C071S063000, C071S064070, C071S903000
Reexamination Certificate
active
07736412
ABSTRACT:
Improved gypsum fertilizer compositions are provided by coating of naturally-occurring or synthesized gypsum with low pH maleic-itaconic copolymers. The preferred copolymers are aqueous dispersions of acid or partial salt maleic-itaconic copolymers, and are applied by spraying or other means onto the surface of gypsum and allowed to dry. The copolymer coatings increase the solubility of sulfate and Ca ions from the gypsum, allowing accelerated plant availability and uptake of such nutrients.
REFERENCES:
patent: 2616849 (1952-11-01), Giammaria
patent: 4083835 (1978-04-01), Pohlemann et al.
patent: 4471100 (1984-09-01), Tsubakimoto et al.
patent: 4929690 (1990-05-01), Goertz et al.
patent: 5047078 (1991-09-01), Gill
patent: 5688907 (1997-11-01), Wood et al.
patent: 5997602 (1999-12-01), Aijala
patent: 6139596 (2000-10-01), Barth et al.
patent: 6187074 (2001-02-01), von Locquenhien et al.
patent: 6287359 (2001-09-01), Erhardt et al.
patent: 6309439 (2001-10-01), von Locquenghien et al.
patent: 6312493 (2001-11-01), Eltink et al.
patent: 6413292 (2002-07-01), v. Locquengh et al.
patent: 6488734 (2002-12-01), Barth et al.
patent: 6515090 (2003-02-01), Sanders et al.
patent: 6653428 (2003-11-01), Klein et al.
patent: 6706837 (2004-03-01), Sanders et al.
patent: 6930139 (2005-08-01), Sanders et al.
patent: 7317062 (2008-01-01), Pritschins et al.
patent: 7686863 (2010-03-01), Sanders
patent: 2001/0029762 (2001-10-01), Steele et al.
patent: 2005/0115290 (2005-06-01), Sanders et al.
patent: 2007/0027281 (2007-02-01), Michl et al.
patent: 2008/0173053 (2008-07-01), Sanders et al.
patent: 2009/0163365 (2009-06-01), Bentlage et al.
patent: 2009/0270257 (2009-10-01), Pursell et al.
patent: 4132620 (1993-04-01), None
patent: 54050027 (1979-04-01), None
patent: 54077294 (1979-06-01), None
patent: 61282301 (1986-12-01), None
Newly Developed Itaconic Acid Copolymers for Gypsum and Calcium Carbonate Scale Control; Shakkthivel et al.; Journal of Applied Polymer Science; 2007; vol. 103, Issue 5, pp. 3206-3213.
Water Soluble Polymers. Ix. N-(2-chloroethyl)-sulfonamides of Styrene-maleic Acid and Styrene-itaconic Acid Copolymers; Machida et al.; Sen'i Gakkaishi (1966), 22(6), 269-73.
In-situ Polymerization of Maleic Acid and Itaconic Acid on Cotton: MALDI/TOF Mass Spectroscopy and Light-Scattering Study; Charles Q. Yang.; Yun Lu; Textile Research Journal, vol. 70, No. 4, 359-62 (2000).
Hovey & Williams, LLP
Langel Wayne
Specialty Fertilizer Products, LLC
LandOfFree
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