IP Library › Granted Patent US 12,214,236
Granted Patent B2
US 12,214,236 · App. 18/404,027 · Granted Feb 4, 2025

Long-term fire retardant with corrosion inhibitors and methods for making and using same

Inventors: Dennis Hulbert (Corvallis, MT); Robert J. Burnham (Stevensville, MT); Michael S. Schnarr (Roseville, CA); Gerald Geissler (Kailua-Kona, HI); David W. Wilkening (Ronan, MT); Joseph McLellan (Rocklin, CA); Michael White (Roseville, CA)
Assignee: FRS Group, LLC
A62D1/005A62C3/02A62D1/0007A62D1/0035C01F5/40
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Quick Facts
Patent No.
US 12,214,236
App. No.
18/404,027
Granted
Feb 4, 2025
Kind
B2
Abstract

A forest fire retardant composition contains a retardant compound that includes a phosphate salt. The phosphate salt may include diammonium phosphate, diammonium orthophosphate, monoammonium phosphate, monoammonium orthophosphate, monosodium phosphate, disodium phosphate, disodium phosphate hydrate, sodium ammonium phosphate, sodium ammonium phosphate hydrate, sodium tripolyphosphate, trisodium phosphate, or dipotassium phosphate, and combinations thereof. The forest fire retardant composition may include an ammonium source. The composition may be in the form of a dry concentrate, a liquid concentrate, or a final diluted product. The final diluted product is effective in suppressing, retarding, and controlling forest fires while exhibiting corrosion resistance and low toxicity.

Claims (63)

1. A forest fire retardant concentrate, comprising:

a mixture of phosphates comprising:

diammonium phosphate;

monoammonium phosphate; and

at least one of a sodium phosphate salt, a calcium phosphate salt, or a potassium phosphate salt;

a corrosion inhibitor for at least one of steel, brass, aluminum, or magnesium, present in the concentrate in an amount having a weight percent of about 0.1% to about 3.0% relative to total weight of the concentrate; and

a thickening agent, present in the concentrate in an amount having a weight percent of about 0.75% to about 5.0% relative to total weight of the concentrate.

2. The concentrate of claim 1 , wherein the concentrate has a molar ratio of ammoniacal nitrogen to phosphorus (N/P molar ratio) of less than about 1.4.

3. The concentrate of claim 2 , wherein the concentrate has a molar ratio of ammoniacal nitrogen to phosphorus (N/P molar ratio) of less than about 1.3.

4. The concentrate of claim 3 , wherein the concentrate has a molar ratio of ammoniacal nitrogen to phosphorus (N/P molar ratio) of less than about 1.1.

5. The concentrate of claim 1 , wherein the sodium phosphate salt, the calcium phosphate salt, or the potassium phosphate salt comprises at least one of monosodium phosphate, disodium phosphate, disodium phosphate hydrate, sodium ammonium phosphate, sodium ammonium phosphate hydrate, sodium tripolyphosphate, trisodium phosphate, monocalcium phosphate, dicalcium phosphate, tricalcium phosphate, octacalcium phosphate, dicalcium diphosphate, calcium triphosphate, hydroxyapatite, apatite, tetracalcium phosphate, monopotassium phosphate, dipotassium phosphate, or tripotassium phosphate.

6. The concentrate of claim 1 , wherein the corrosion inhibitor comprises at least one of:

an alkyl amine;

one or more azoles; or

disodium molybdate dihydrate.

7. The concentrate of claim 1 , wherein the thickening agent comprises at least one of a polyurethane, a polyvinyl alcohol, an acrylic polymer, a gum, a cellulosic, a sulfonate, a saccharide, a clay, an organosilicone, or a protein.

8. The concentrate of claim 7 , wherein the thickening agent comprises the gum.

9. The concentrate of claim 8 , wherein the gum comprises a polysaccharide gum.

10. The concentrate of claim 1 , further comprising a colorant, present in the concentrate in an amount having a weight percent of about 0.04% to about 6.0% relative to total weight of the concentrate.

11. The concentrate of claim 10 , wherein the colorant comprises an inorganic pigment and an organic pigment.

12. The concentrate of claim 11 , wherein the organic pigment comprises a fluorescent pigment.

13. The concentrate of claim 11 , wherein the inorganic pigment comprises iron oxide.

14. The concentrate of claim 1 , further comprising a buffering agent present in the concentrate in an amount having a weight percent of about 2% to about 58% relative to the total weight of the concentrate.

15. The concentrate of claim 1 , wherein:

the concentrate is a dry concentrate having no more than about 3% by weight of water relative to the total weight of the dry concentrate; and

the mixture of phosphates is present in the dry concentrate in an amount having a weight percent of about 62% to about 99% relative to the total weight of the dry concentrate.

16. The concentrate of claim 1 , wherein:

the concentrate is a liquid concentrate further comprising water; and

the mixture of phosphates is present in the liquid concentrate in an amount having a weight percent of about 30% to about 80% relative to the total weight of the liquid concentrate.

17. A final diluted product formed by diluting the concentrate of claim 1 with water;

wherein:

the final diluted product is intended for use to suppress, retard, or contain forest fires;

the mixture of phosphates is present in the final diluted product in an amount having a weight percent of about 6% to about 28% relative to the total weight of the final diluted product; and

the final diluted product has a pH of about 5.0 to about 7.0.

18. A forest fire retardant concentrate, comprising:

a mixture of phosphates comprising:

at least one ammonium phosphate salt; and

at least one of a sodium phosphate salt, a calcium phosphate salt, or a potassium phosphate salt;

a corrosion inhibitor for at least one of steel, brass, aluminum, or magnesium, present in the concentrate in an amount having a weight percent of about 0.1% to about 3.0% relative to total weight of the concentrate; and

guar gum, present in the concentrate in an amount having a weight percent of about 0.75% to about 5.0% relative to total weight of the concentrate.

19. The concentrate of claim 18 , wherein the at least one ammonium phosphate comprises at least one of diammonium phosphate, diammonium orthophosphate, monoammonium phosphate, monoammonium orthophosphate, or ammonium polyphosphate.

20. The concentrate of claim 18 , wherein the at least one sodium phosphate salt, the calcium phosphate salt, or the potassium phosphate salt comprises at least one of monosodium phosphate, disodium phosphate, disodium phosphate hydrate, sodium ammonium phosphate, sodium ammonium phosphate hydrate, sodium tripolyphosphate, trisodium phosphate, monocalcium phosphate, dicalcium phosphate, tricalcium phosphate, octacalcium phosphate, dicalcium diphosphate, calcium triphosphate, hydroxyapatite, apatite, tetracalcium phosphate, monopotassium phosphate, dipotassium phosphate, or tripotassium phosphate.

21. The concentrate of claim 18 , wherein the corrosion inhibitor comprises at least one of:

an alkyl amine;

one or more azoles; or

disodium molybdate dihydrate.

22. The concentrate of claim 18 , further comprising a colorant, present in the concentrate in an amount having a weight percent of about 0.04% to about 6.0% relative to total weight of the concentrate.

23. The concentrate of claim 22 , wherein the colorant comprises an inorganic pigment and an organic pigment.

24. The concentrate of claim 23 , wherein the organic pigment comprises a fluorescent pigment.

25. The concentrate of claim 23 , wherein the inorganic pigment comprises iron oxide.

26. The concentrate of claim 18 , further comprising a buffering agent present in the concentrate in an amount having a weight percent of about 2% to about 58% relative to the total weight of the concentrate.

27. The concentrate of claim 18 , wherein the concentrate has a molar ratio of ammoniacal nitrogen to phosphorus (N/P molar ratio) of less than about 1.4 or greater than about 1.9.

28. The concentrate of claim 18 , wherein:

the concentrate is a dry concentrate having no more than about 3% by weight of water relative to the total weight of the dry concentrate; and

the mixture of phosphates is present in the dry concentrate in an amount having a weight percent of about 60% to about 99.5% relative to the total weight of the dry concentrate.

29. The concentrate of claim 18 , wherein:

the concentrate is a liquid concentrate further comprising water; and

the mixture of phosphates is present in the liquid concentrate in an amount having a weight percent of about 30% to about 80% relative to the total weight of the liquid concentrate.

30. A final diluted product formed by diluting the concentrate of claim 18 with water;

wherein:

the final diluted product is intended for use to suppress, retard, or contain forest fires;

the mixture of phosphates is present in the final diluted product in an amount having a weight percent of about 4% to about 30% relative to the total weight of the final diluted product; and

the final diluted product has a pH of about 5.0 to about 7.0.

Assignments (6)
SECURITY INTEREST Recorded Jan 2, 2026
From: PERIMETER SOLUTIONS LP
To: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, AS NOTES COLLATERAL AGENT
Reel/Frame 073353/0552 →
NOTES PATENT SECURITY AGREEMENT Recorded Jan 2, 2026
From: PERIMETER SOLUTIONS LP
To: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, AS NOTES COLLATERAL AGENT
Reel/Frame 074174/0258 →
PATENT SECURITY AGREEMENT Recorded Dec 19, 2025
From: PERIMETER SOLUTIONS LP
To: MORGAN STANLEY SENIOR FUNDING, INC., AS ADMINISTRATIVE AGENT
Reel/Frame 074007/0465 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 2, 2025
From: FORTRESS NORTH AMERICA, LLC; FRS GROUP LLC; COMPASS MINERALS AMERICA INC.
To: PERIMETER SOLUTIONS, LP
Reel/Frame 072791/0298 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 11, 2024
From: HULBERT, DENNIS; BURNHAM, ROBERT J.; SCHNARR, MICHAEL S.; GEISSLER, GERALD; MCLELLAN, JOSEPH; WHITE, MICHAEL
To: FRS GROUP, LLC
Reel/Frame 066101/0295 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 11, 2024
From: WILKENING, DAVID W.
To: FRS GROUP, LLC
Reel/Frame 066101/0318 →
Continuity (7)
Continuation 18299525 · Apr 12, 2023
Continuation 18060946 · Dec 1, 2022
Continuation 17821060 · Aug 19, 2022
Continuation 17552196 · Dec 15, 2021
Provisional Application 63140657 · Jan 22, 2021
Provisional Application 63125693 · Dec 15, 2020
Related Publication 20240139573A1 · May 2, 2024
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