What is an S-signature in patent correspondence?

An S-signature is an electronically created signature used in patent correspondence. According to MPEP 502.02:

An S-signature is a signature inserted between forward slash marks, but not a handwritten signature as defined by 37 CFR 1.4(d)(1). An S-signature includes any signature made by electronic or mechanical means, and any other mode of making or applying a signature other than a handwritten signature as provided for in 37 CFR 1.4(d)(1).

S-signatures must meet specific requirements to be considered valid:

• They must be between two forward slash marks
• They can include letters, numbers, and punctuation marks
• They must be personally inserted by the signer
• They must be reasonably specific to the signer

S-signatures provide a convenient way for applicants and practitioners to sign documents electronically while maintaining the legal weight of a handwritten signature.

To learn more:

• S-signature
• electronic signature
• patent correspondence
• USPTO