What are the requirements for recordation (37 CFR 3)?

Essentially the rules:

(1) specify the minimum information about the transaction that must be submitted;

(2) require submitters to submit this information of a separate cover sheet; and

(3) specify that submissions must be legible and of such quality to permit processing; and

(4) pay the proper recording fee.

The rules permit submission of true copies of assignment-related documents; original documents are not required nor desired.