US 11,883,703 B2
Long-term fire retardant with magnesium sulfate and corrosion inhibitors and methods for making and using same
Dennis Hulbert, Corvallis, MT (US); Robert J. Burnham, Stevensville, MT (US); Michael S. Schnarr, Roseville, CA (US); Gerald Geissler, Kailua-Kona, HI (US); David W. Wilkening, Ronan, MT (US); and Joseph McLellan, Rocklin, CA (US)
Assigned to FRS Group, LLC, Rocklin, CA (US)
Filed by FRS Group, LLC, Rocklin, CA (US)
Filed on Mar. 10, 2023, as Appl. No. 18/182,198.
Application 18/182,198 is a continuation of application No. 17/845,569, filed on Jun. 21, 2022, granted, now 11,602,658.
Application 17/845,569 is a continuation of application No. 17/458,002, filed on Aug. 26, 2021, granted, now 11,395,934, issued on Jul. 26, 2022.
Claims priority of provisional application 63/140,657, filed on Jan. 22, 2021.
Claims priority of provisional application 63/125,693, filed on Dec. 15, 2020.
Prior Publication US 2023/0211199 A1, Jul. 6, 2023
Int. Cl. A62D 1/00 (2006.01); A62C 3/02 (2006.01); C01F 5/40 (2006.01)
CPC A62D 1/005 (2013.01) [A62C 3/02 (2013.01); A62D 1/0007 (2013.01); A62D 1/0035 (2013.01); C01F 5/40 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of combating a forest fire, the method comprising:
depositing, via aerial or ground-based application, a forest fire retardant composition comprising:
a retardant compound comprising Kieserite (MgSO4(H2O)1),Dipotassium Sulfate (K2SO4), Hexahydrite (MgSO4(H2O)6), and Epsomite (MgSO4(H2O)7);
a corrosion inhibitor for at least one of iron, brass, aluminum, or magnesium present in the composition in an amount having a weight percent of about 0.2% to about 6.0% relative to the weight of the retardant compound in the composition;
a thickening agent, present in the composition in an amount having a weight percent of about 1.5% to about 6.5% relative to the weight of the retardant compound in the composition;
a colorant, present in the composition in an amount having a weight percent of about 0.4% to about 3.5% relative to the weight of the retardant compound in the composition; and
water;
wherein the step of depositing comprises at least one of (a) a direct attack on the forest fire or (b) an indirect attack before the forest fire.