U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.

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Class 409 - Gear cutting, milling, or planing

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354 Subclasses


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Definition

This class is the home for a patent directed to the method of or a machine for penetrating material without substantially reshaping the flow of such material by means of a solid tool whose edge defines a line of cut, where in the device is intended to: (a) form a product from a workpiece, which product includes protuberances intended to interfit with pockets in a cooperating member, generally for the transmission of motive force from one of the members to the other; (b) cut by a rotating cutter that forms a shaped surface on the workpiece; or (c) cut by a cutter that reciprocates relative to a workpiece and forms a shaped surface on the workpiece).

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