The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 30, 2007
Filed:
Jun. 27, 2005
Fu Ching Lee, Los Angeles, CA (US);
Fu Ching Lee, Los Angeles, CA (US);
Other;
Abstract
A capacitive soil moisture sensor that is easy to install, does not require complex calibration, can sense moisture at a particular depth, can accommodate soils of different composition, does not alter soil densities, provides fast response to changes in moisture and provides stable long term use. The sensor comprising of a body () onto which is attached a plurality of first electrode () and a plurality of second electrode (). A plurality of protective layer () of low dielectric constant material is applied over the electrodes and against the body () to provide a physical barrier to prevent a conduction path from the first electrode () to the second electrode () and to provide protection against physical damage. The first and second electrodes (), (), once inserted into the soil, forms a capacitor with the soil as the dielectric. A change in soil moisture causes the capacitance of the sensor to change.