What are the different types of subject matter combinations in patent classification?
According to MPEP 903.02(b), there are several types of subject matter combinations in patent classification:
- Basic Subject Matter Combined with Feature for Some Additional Purpose: The MPEP states, “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.”
- Basic Subject Matter Combined with Perfecting Feature: “Features may be added to the basic subject matter which do not change the character thereof, but do perfect it for its intended purpose; e.g., an overload release means tends to perfect a stonecrusher by providing means to stop it on overload and thus prevent ruining the machine.”
- Basic Subject Matter: “The combination of features necessary and essential to the fundamental character of the subject matter treated; e.g., a stonecrusher requires a minimum number of features as essential before it can function as such.”
Understanding these combinations is crucial for proper patent classification and searching.
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