This Day in History: Hymen Lipman Patents Pencil with Attached Eraser (1858)

This Day in History:
Hymen Lipman Patents Pencil with Attached Eraser (1858)

In prehistoric times, lumps of colored earth or chalk were used as markers. The so-called lead pencil—a rod of graphite encased in wood—first came into use in the 16th century. However, it was not until the 19th century that the eraser was added—an innovation that earned Hymen Lipman a patent in 1858. In 1862, he sold his patent to Joseph Reckendorfer for $100,000. Why did the US Supreme Court rule in 1875 that Reckendorfer’s patent was invalid? More…: https://play.google.com/store/apps/details?id=com.tfd.mobile.TfdSearch

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