Lipman... He actually invented the pencil eraser on top of the pencil because people kept making mistakes. How hard it would without making any mistakes.
Edward Nairne first developed the the eraser and it was widely used. However, these rubbers used to go bad after a certain length of time. Hymen Lipman received the first patent for attaching a rubber to the end of a pencil.
It's been more than 150 years since the eraserattached itself to the pencil. We can only assume that hymen-lipmanwas a man who made his fair share of mistakes, but they may have inspired him to stick the eraser on the end of the pencil, making it more convenient to erase the written errors. He got a patent for the development on this date in 1858. Lipman's early version was a pencil with a groove at the top, into which he glued an eraser. He sold his patent in 1862; the US Supreme Court later invalidated it, saying that since combining a pencil with an eraser did not change the function of either item, the pencil-with-eraser could not be patented.
in 1770 the eraser was made
eraser was not invented but discovered by an unknown person
Lipman... He actually invented the pencil eraser on top of the pencil because people kept making mistakes. How hard it would without making any mistakes.
According to Wikipedia, Hyman L Lipman is the man who first put the eraser on the pencil., and got $100,000 for it.
Edward Nairne first developed the the eraser and it was widely used. However, these rubbers used to go bad after a certain length of time. Hymen Lipman received the first patent for attaching a rubber to the end of a pencil.
Hymen Lipman, an American inventor, received the first patent for attaching an eraser to the end of a pencil in 1858. However, this design was later revised by Hyman Lipman and Joseph Reckendorfer in 1875, leading to a legal dispute over the patent rights, which ultimately established the eraser-tipped pencil we use today.
It's been more than 150 years since the eraserattached itself to the pencil. We can only assume that hymen-lipmanwas a man who made his fair share of mistakes, but they may have inspired him to stick the eraser on the end of the pencil, making it more convenient to erase the written errors. He got a patent for the development on this date in 1858. Lipman's early version was a pencil with a groove at the top, into which he glued an eraser. He sold his patent in 1862; the US Supreme Court later invalidated it, saying that since combining a pencil with an eraser did not change the function of either item, the pencil-with-eraser could not be patented.
Hymen L. Lipman is credited with registering the first patent for a pencil with an attached eraser on March 30, 1858. You can find out more about him at the information below.
Eraser
Hymen Lipman made it possible for students to write in pencil and erase mistakes without having to do it with two separate devices when he attached the latter to the former. Now, whomever decided that the typical color for a pencil should be yellow and the eraser pink, is fodder for a follow-up question or two!
The weight of a pencil eraser can vary depending on the type of eraser and its size. On average, a standard pencil eraser weighs around 0.1 to 0.5 grams.
The eraser costs 1.50.
The volume of a typical pencil eraser is approximately 1-2 cubic centimeters.
TrackPoint Source - PC Tech