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With patents, the class or classification is based on what type of invention you are patenting. Classes are defined by the U.S. Patent Classification System or USPC. A subclass is as the name suggests a narrower definition (subclass) within a class. Each class or subclass has a number assigned to it.
With trademarks, the class or classification means what kind (class) of goods or services offered are being represented by a certain trademark. Trademark classification is based on International Trade Codes. Each class has a number assigned to it.