What is the difference between an assignment and a 37 CFR 3.73(c) statement?

An assignment and a 37 CFR 3.73(c) statement serve different purposes in the patent application process:

• Assignment: This is the actual transfer of ownership rights from the inventor(s) to the assignee.
• 37 CFR 3.73(c) statement: This is a document filed with the USPTO to establish the assignee’s right to take action in a patent application.

As stated in MPEP 325: “The submission of the statement pursuant to 37 CFR 3.73(c) is not required if a 37 CFR 3.73(b) statement has been previously filed in the application or patent prior to September 16, 2012.” This highlights that the 3.73(c) statement is a procedural document for USPTO purposes, while the assignment is the substantive transfer of rights.

For more information on USPTO procedures, visit: USPTO procedures.