IP Library › Granted Patent US 12,699,080
Granted Patent B2
US 12,699,080 · App. 18/297,731 · Granted Aug 4, 2026

Systems, methods and indicator materials for assessing reduction state in soils

Inventor: Martin C. Rabenhorst (University Park, MD)
Assignee: University of Maryland, College Park
G01N33/24B01L3/5082C01G45/02G01N1/08G01N31/22G01N33/00B01L2200/025B01L2200/12B01L2300/0832B01L2300/123C01P2002/72G01N2001/021
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Quick Facts
Patent No.
US 12,699,080
App. No.
18/297,731
Granted
Aug 4, 2026
Kind
B2
Abstract

The present invention relates an indicator system for assessing a reduction state of unconsolidated material that includes a delivery tube defining an interior chamber, and a substrate disposed within the interior chamber and including a reactive coating thereon. The reactive coating is at least partially removable from the substrate upon exposure to a reducing condition of unconsolidated material over a period of time. An indicator device including a reactive coating comprising a manganese oxide is also disclosed.

Claims (7)

1 . A method of producing a manganese oxide coating, comprising:

reducing a potassium permanganate (KMnO 4 ) solution using sodium (Na) lactate, wherein Na lactate:KMnO 4 molar ratio is greater than about 6.0;

removing excess Na lactate after said reducing step via one or more washing cycles; and

dialyzing said KMnO 4 solution for at least 3 days after said step of removing excess Na lactate.

2 . The method of claim 1 , wherein said manganese oxide coating is stored in a water suspension.

3 . The method of claim 1 , which said reducing comprises a reaction time of less than 120 minutes.

4 . The method of claim 3 , wherein said reducing comprises a reaction time of about 10 minutes to about 120 minutes.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 22, 2026
From: RABENHORST, MARTIN C.
To: UNIVERSITY OF MARYLAND, COLLEGE PARK
Reel/Frame 075034/0224 →
Continuity (4)
Continuation 16340274 · Oct 30, 2017
Provisional Application 62517628 · Jun 9, 2017
Provisional Application 62414853 · Oct 31, 2016
Related Publication 20230314398A1 · Oct 5, 2023
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