ALEXANDRIA, Va., June 17 -- United States Patent no. 12,313,543, issued on May 27, was assigned to PlantDoc LLC (Portland, Ore.).
"Indicator for soil moisture content" was invented by Austin Peters (Portland, Ore.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Devices are provided for indicating a moisture content of a substance such as soil. In an example, a device for indicating a moisture content of soil includes a stem configured to be inserted into the soil and an indicator coupled to the stem and configured to visually indicate the moisture content of the soil, the stem and the indicator each comprised of an absorbent material and at least the indicator including hydrochromic ink on the absorbent mater...