What are the different combinations and subcombinations considered in USPC classification?

The USPC classification system considers various combinations and subcombinations for each type of subject matter. These include:

1. Basic Subject Matter Combined with Feature for Some Additional Purpose: This refers to features added to the basic subject matter that expand its scope beyond the class definition.
2. Basic Subject Matter Combined with Perfecting Feature: These are features that enhance the basic subject matter for its intended purpose without changing its fundamental character.
3. Basic Subject Matter: The essential combination of features necessary for the fundamental character of the subject matter.
4. Subcombinations Specialized to Basic Subject Matter: These are components specifically designed for use with the basic subject matter.
5. Subcombinations of General Utility: Components that have utility across different types of subject matter and are often classified in general classes.

The MPEP provides examples for each of these categories, such as:

“Basic Subject Matter Combined with Feature for Some Additional Purpose. The added purpose is in excess of the scope of the subject matter for the class, as defined in the class definition; e.g., adding a sifter to a stone crusher which gives the added function of separating the crushed stone.”

Understanding these combinations and subcombinations is crucial for accurate patent classification and effective prior art searching.

To learn more:

• USPC
• Patent Classification
• Combinations
• Subcombinations
• Basic Subject Matter