Jay Wallace Lathrop (Bangor, Maine, 6 September 1927 - Asheville, North Carolina, 9 October 2022) was an American engineer and inventor of

photolithography Photolithography (also known as optical lithography) is a process used in the manufacturing of integrated circuits. It involves using light to transfer a pattern onto a substrate, typically a silicon wafer. The process begins with a photosensiti ...

. Born in 1927 in

Bangor, Maine Bangor ( ) is a city in and the county seat of Penobscot County, Maine, United States. The city proper has a population of 31,753, making it the state's List of municipalities in Maine, third-most populous city, behind Portland, Maine, Portland ...

, Lathrop studied physics in the

University of Maine The University of Maine (UMaine) is a Public university, public Land-grant university, land-grant research university in Orono, Maine, United States. It was established in 1865 as the land-grant college of Maine and is the Flagship universitie ...

, and

Massachusetts Institute of Technology The Massachusetts Institute of Technology (MIT) is a Private university, private research university in Cambridge, Massachusetts, United States. Established in 1861, MIT has played a significant role in the development of many areas of moder ...

, where he get his BS, MS, and PhD. When he worked as an engineer for the US Army's Diamond Ordnance Fuze Laboratories in the 1950s, he needed to devise a "new

proximity fuze A Proximity Fuse (also VT fuse or "variable time fuze") is a fuse that detonates an explosive device automatically when it approaches within a certain distance of its target. Proximity fuses are designed for elusive military targets such as air ...

to go inside a

mortar shell A mortar today is usually a simple, lightweight, man-portable, muzzle-loaded cannon, consisting of a smooth-bore (although some models use a rifled barrel) metal tube fixed to a base plate (to spread out the recoil) with a lightweight bipod m ...

only a couple of inches in diameter". The

transistor A transistor is a semiconductor device used to Electronic amplifier, amplify or electronic switch, switch electrical signals and electric power, power. It is one of the basic building blocks of modern electronics. It is composed of semicondu ...

s that existed at that time were too large, and Lathrop tried to miniaturise them. Lathrop, together with Jim Nall, used

photoresist A photoresist (also known simply as a resist) is a light-sensitive material used in several processes, such as photolithography and photoengraving, to form a patterned coating on a surface. This process is crucial in the electronics industry. T ...

from

Eastman Kodak The Eastman Kodak Company, referred to simply as Kodak (), is an American public company that produces various products related to its historic basis in film photography. The company is headquartered in Rochester, New York, and is incorporated i ...

to create a mask on a

germanium Germanium is a chemical element; it has Symbol (chemistry), symbol Ge and atomic number 32. It is lustrous, hard-brittle, grayish-white and similar in appearance to silicon. It is a metalloid or a nonmetal in the carbon group that is chemically ...

, thus inventing

. They were awarded with $25,000 by the army for their invention in 1958; Lathrop bought "a new station wagon" with this money. Lathrop worked for seven years at the Diamond Ordnance Fuze Lab; he then found a job at

Texas Instruments Texas Instruments Incorporated (TI) is an American multinational semiconductor company headquartered in Dallas, Texas. It is one of the top 10 semiconductor companies worldwide based on sales volume. The company's focus is on developing analog ...

in Dallas, where he spent ten years and became Director of Advanced Technology for the Semiconductor Division; he worked there with

Jack Kilby Jack St. Clair Kilby (November 8, 1923 – June 20, 2005) was an American electrical engineer who took part, along with Robert Noyce of Fairchild Semiconductor, in the realization of the first integrated circuit while working at Texas Instrumen ...

. In 1968 he became a professor at

Clemson University Clemson University () is a Public university, public Land-grant university, land-grant research university near Clemson, South Carolina, United States. - The blue-shaded pattern denotes university property. This shows Clemson University is ''out ...

. Lathrop died on October 9, 2022, at

Asheville, North Carolina Asheville ( ) is a city in Buncombe County, North Carolina, United States. Located at the confluence of the French Broad River, French Broad and Swannanoa River, Swannanoa rivers, it is the county seat of Buncombe County. It is the most populou ...

, and donated his body to the

Medical University of South Carolina The Medical University of South Carolina (MUSC) is a public medical school in Charleston, South Carolina. It opened in 1824 as a small private college aimed at training physicians and has since established hospitals and medical facilities acros ...

References

Further reading