GUIDANCE FOR USERS | USPTO

As a general rule, design and development services directly related to tangible items or visual displays, such as machinery and graphic arts, are in Class 42. On the other hand, design and development of intangibles is classified according to the nature of the intangible. For example, design of intangibles in the nature of advertising, insurance policies or educational curriculum is in Classes 35, 36 and 41, respectively.

via GUIDANCE FOR USERS | USPTO.

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