How should envelopes containing trade secret or proprietary materials be addressed to the USPTO?

Envelopes or containers with trade secret or proprietary materials should be clearly addressed and labeled. The MPEP provides examples of appropriate labels: A. ‘TRADE SECRET MATERIAL NOT OPEN TO PUBLIC. TO BE OPENED ONLY BY EXAMINER OR OTHER AUTHORIZED U.S. PATENT AND TRADEMARK OFFICE EMPLOYEE. DO NOT SCAN’ or B. ‘PROPRIETARY MATERIAL NOT OPEN TO…

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