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Rebecca “Becky” Schroeder (born 1962) is an American inventor and one of the youngest females to be granted a U.S. patent at the age of 12. [1] At the age of 10, she conceived the idea of a luminescent backing sheet that would enable writing in the dark.
William B. Purvis (12 August 1838 – 10 August 1914) [1] was an African-American inventor and businessman who received multiple patents in the late 19th-century. His inventions included improvements on paper bags, an updated fountain pen design, improvement to the hand stamp, and a close-conduit electric railway system.
By the nineteenth century, writing slates were used around the world in nearly every school and were a central part of the slate industry. At the dawn of the twentieth century, writing slates were the primary tool in the classroom for students. In the 1930s (or later) writing slates began to be replaced by more modern methods. [5]
In 1993, Ashok Gadgil invented a lightweight, easy-to-use and economical device that used UV light to purify water. It could process four gallons per minute at a cost of 5 cents for every thousand ...
Zuccato's system involved writing on a sheet of varnished paper with caustic ink, which ate through the varnish and paper fibers, leaving holes where the writing had been. This sheet – which had now become a stencil – was placed on a blank sheet of paper, and ink rolled over it so that the ink oozed through the holes, creating a duplicate ...
Bette Nesmith Graham (March 23, 1924 – May 12, 1980) was an American typist, commercial artist, and the inventor of the correction fluid Liquid Paper.Born as Bette Clair McMurry [1], she married Warren Nesmith at the age of 19 and became the mother of the musician and producer Michael Nesmith, who later became the guitarist of The Monkees.
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