Location History:
- Lemon Grove, CA (US) (1981 - 1982)
- Desert Hot Springs, CA (US) (1986)
- Forest Grove, OR (US) (1983 - 1990)
- Sweet Home, OK (US) (2014)
- Sweet Home, OR (US) (2001 - 2019)
Company Filing History:
8 out of 32 
7 out of 832,843 Years Active: 1981-2019
Title: Innovations in Metal Detection: The Contributions of John L. Earle
Introduction
John L. Earle, an accomplished inventor based in Sweet Home, Oregon, has made significant strides in the field of metal detection, holding an impressive portfolio of 15 patents. His innovative solutions have redefined the functionality and effectiveness of metal detectors, addressing various challenges faced by users in diverse environments.
Latest Patents
Among Earle's latest innovations is the groundbreaking patent for a ground eliminating metal detector. This invention utilizes rapid high current in a transmit coil, allowing for remanent ground response detection when the coil is at zero current. The method involves alternating between high voltage and low voltage to maintain stable current in the transmit coil, followed by zero current periods. This sequence enables the detection of combined ground remanence and target eddy current signals, optimizing accuracy in signal processing.
Another notable patent relates to an auto nulling induction balance metal detector. This device comprises a large primary transmit coil, a small primary feedback bucking coil, and two receive coils, with a variable resistance device linking them. The configuration allows for the effective summation of signals, addressing the complexities of stray coupled signals during metal detection. Earle's inventions demonstrate a meticulous approach to enhancing metal detection technology, making it more efficient and reliable.
Career Highlights
Throughout his career, Earle has been associated with White's Electronics, Inc., where he applied his innovative thinking to improve metal detection systems. His expertise in this area has led to a significant impact on the industry, driving advancements that are widely utilized today.
Collaborations
Earle's journey in innovation has been enriched by collaborations with distinguished individuals, including Eric Foster and Carl Moreland. Their combined efforts have played a crucial role in refining the concepts and technologies behind the metal detection devices Earle has developed.
Conclusion
John L. Earle's contributions to the field of metal detection are a testament to his ingenuity and dedication as an inventor. With 15 patents to his name, his latest innovations continue to push the boundaries of technology, offering enhanced solutions that cater to the evolving needs of metal detection. The impact of his work is felt not just in the industry but also in the broader scope of innovation, inspiring future generations of inventors.