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In 1862, Lipman sold his lead-pencil and eraser patent for $100,000 to Joseph Reckendorfer, who went to sue the pencil manufacturer Faber for infringement. [2] In 1875, the Supreme Court of the United States ruled against Reckendorfer, declaring the patent invalid because his invention was actually a combination of two already known things with ...
A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" / ˈ l ɛ d /. The lead , often made of graphite , is not bonded to the outer casing, and the user can mechanically extend it as its point is worn away from use.
Invented by Harold Grossman [53] for the Empire Pencil Company in 1967, plastic pencils were subsequently improved upon by Arthur D. Little for Empire from 1969 through the early 1970s; the plastic pencil was commercialised by Empire as the "EPCON" Pencil. These pencils were co-extruded, extruding a plasticised graphite mix within a wood ...
Lead pencil may refer to: Pencil , a writing implement or art medium usually constructed of a narrow, solid pigment core inside a protective casing Mechanical pencil , a pencil with mechanically extendable solid pigment core called a lead
U.S. patent 1,130,741 New and useful Improvements in Lead-Pencils and #1151016, and ... a Mechanical Pencil Pioneer; Inventor Never Got Rewards of Pencil ...
The 3rd-4th-century writing implements from Mtskheta, Georgia.. The original form of "lead pencil" was the leaden stylus used by the ancient Romans, who also used it to write on wood or papyrus by leaving dark streaks where the soft metal rubbed off onto the surface.
Nicolas-Jacques Conté (French pronunciation: [nikɔla ʒak kɔ̃te]; 4 August 1755 – 6 December 1805) was a French inventor of the modern pencil. [1]He was born at Saint-Céneri-près-Sées (now Aunou-sur-Orne) in Normandy and distinguished himself for his mechanical genius, which was of great avail to the French army in Egypt.
Thomas Midgley Jr. (May 18, 1889 – November 2, 1944) was an American mechanical and chemical engineer.He played a major role in developing leaded gasoline (tetraethyl lead) and some of the first chlorofluorocarbons (CFCs), better known in the United States by the brand name Freon; both products were later banned from common use due to their harmful impact on human health and the environment.