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

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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.

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Class 37 - Excavating

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287 Subclasses


Subclasses list

Definition

This class relates to the broad art of digging, moving, and handling material. This class includes method or apparatus for the removal of a tree, stone, soil, or snow from an in situ location, either on the earth"s surface or beneath a body of water.

GENERAL NOTE: Wherever the drawings in this class (37) are associated with the definitions, they are merely used to illustrate the basic concept encompassed by the definition of that subclass and should not be construed as limiting the scope of the subject matter covered by that subclass.

Lines with other classes and within this class

The classes in References to Other Classes, below, contain art relating to this class, but special in application. Hence patents properly classifiable in those classes would be excluded from this class (37).
 
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