Legal Definitions - alpha subclass

An alpha subclass is a classification used in U.S. patent law that has an alphabetic suffix. This suffix is added to the end of a patent classification to further specify the subject matter of the patent. For example, the classification "G06F" refers to patents related to computer technology, while the alpha subclass "G06F 3/00" refers specifically to input devices for computers.

Another example of an alpha subclass is "A61K 31/00" which refers to patents related to medicinal preparations. The alpha subclass "A61K 31/045" specifies patents related to preparations containing organic compounds.

These examples illustrate how alpha subclasses provide more specific information about the subject matter of a patent. This can be helpful for patent examiners and those searching for patents in a particular field.