What's the difference between Micro, Small, and Large Entities

The difference comes from the size of your company. The requirements for each are:

Micro Entity

• Not named on more than 4 previously filed applications
  
• Gross income on last years tax filing does not exceed $150,162
•  Under no obligation to assign/grant/convey a license/ownership to another entity that does not meet the income requirements.

Small Entity

• A nonprofit organization OR less than 500 employees
• Have not assigned/licensed/conveyed an interest in the invention to a non-small entity

Large Entity

Large entities pay the heights fees at the USPTO. There are no qualification to be a large entity. If you do not qualify as a micro entity or a small entity you are a large entity.