MPEP § 501 — MPEP § 501
Current through: 2022-07-01

501-Filing Papers With the U.S. Patent and Trademark Office 
 
 

 
 
 
 
 
 
 
 

 

 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 

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 Chapter 0500 

 Section 501 
 

 
 
 
 
 
 501 Filing Papers With the U.S. Patent and Trademark Office [R-01.2024]

 
 37 CFR 1.1 Addresses for non-trademark correspondence with the United States Patent and
 Trademark Office. 

 
 (a) In general. Except for correspondence submitted via the U.S.
 Patent and Trademark Office (USPTO) patent electronic filing system in accordance
 with § 1.6(a)(4), all correspondence intended for the USPTO must be addressed to
 either “Director of the United States Patent and Trademark Office, P.O. Box 1450,
 Alexandria, Virginia 22313-1450” or to specific areas within the Office provided
 in this section. When appropriate, correspondence should also be marked for the
 attention of a particular office or individual.
 
 (1) Patent correspondence. 
 (i) In general. All correspondence concerning patent
 matters processed by organizations reporting to the Commissioner for
 Patents should be addressed to: Commissioner for Patents, P.O. Box
 1450, Alexandria, Virginia 22313-1450.
 

 (ii) Patent Trial and Appeal Board. See
 § 41.10 or §
 42.6 of this title. Notices of appeal, appeal
 briefs, reply briefs, requests for oral hearing, as well as all other
 correspondence in an application or a patent involved in an appeal to
 the Board for which an address is not otherwise specified, should be
 addressed as set out in paragraph (a)(1)(i) of this section.
 

 
 

 (2) [Reserved]

 (3) Office of General Counsel correspondence. — 
 
 (i) Litigation and service. Correspondence relating to pending litigation or otherwise
 within the scope of part 104 of this title shall be addressed as
 provided in § 104.2 .
 

 (ii) Disciplinary proceedings. Correspondence to counsel for the Director of the Office of
 Enrollment and Discipline relating to disciplinary proceedings pending
 before a Hearing Officer or the Director shall be mailed to: Mail Stop
 8, Office of the Solicitor, United States Patent and Trademark Office,
 P.O. Box 1450, Alexandria, Virginia 22313-1450.
 

 (iii) Solicitor, in general. Correspondence to the Office of the Solicitor not otherwise
 provided for shall be addressed to: Mail Stop 8, Office of the
 Solicitor, United States Patent and Trademark Office, P.O. Box 1450,
 Alexandria, Virginia 22313-1450.
 

 (iv) General Counsel. Correspondence to the Office of
 the General Counsel not otherwise provided for, including
 correspondence to the General Counsel relating to disciplinary
 proceedings, shall be addressed to: General Counsel, United States
 Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia
 22313-1450.
 

 (v) Improper correspondence. Correspondence improperly
 addressed to a Post Office Box specified in paragraphs (a)(3)(i) and
 (a)(3)(ii) of this section will not be filed elsewhere in the United
 States Patent and Trademark Office, and may be returned.
 

 
 

 (4) Office of Public Records correspondence. 
 (i) Assignments. All patent-related documents submitted
 by mail to be recorded by Assignment Services Division, except for
 documents filed together with a new application, should be addressed
 to: Mail Stop Assignment Recordation Services, Director of the United
 States Patent and Trademark Office, P.O. Box 1450, Alexandria,
 Virginia 22313-1450. See §
 3.27 .
 

 (ii) Documents. All requests for certified or
 uncertified copies of patent documents should be addressed to: Mail
 Stop Document Services, Director of the United States Patent and
 Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.
 

 
 

 (5) Office of Enrollment and Discipline correspondence. All
 correspondence directed to the Office of Enrollment and Discipline
 concerning enrollment, registration, and investigation matters should be
 addressed to Mail Stop OED, Director of the United States Patent and
 Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.
 

 
 

 (b) Patent Cooperation Treaty. Letters and other communications relating to international applications
 during the international stage and prior to the assignment of a national serial
 number should be additionally marked “Mail Stop PCT.”
 

 (c) For reexamination or supplemental examination
 proceedings. 
 (1) All correspondence concerning ex parte 
 reexamination, other than correspondence to the Office of the General
 Counsel pursuant to § 1.1(a)(3) and
 §
 102.04 of this chapter, should be additionally marked
 “Mail Stop Ex Parte Reexam.”
 

 (2) All correspondence concerning inter
 partes reexamination, other than correspondence to the Office
 of the General Counsel pursuant to § 1.1(a)(3) and
 §
 102.4 of this chapter, should be additionally marked
 ‘‘Mail Stop Inter Partes Reexam.’’ 
 

 (3) Requests for supplemental examination
 (original and corrected request papers) and any other paper filed in a
 supplemental examination proceeding, should be additionally marked ‘‘Mail
 Stop Supplemental Examination.’’ 
 

 (4) All correspondence concerning a reexamination
 proceeding ordered as a result of a supplemental reexamination proceeding,
 other than correspondence to the Office of the General Counsel pursuant to
 §
 1.1(a)(3) and § 102.4 of this chapter
 should be additionally marked “Mail Stop Ex Parte 
 Reexam.”
 

 
 

 (d) Payments of maintenance fees. Payments of patent maintenance fees
 that are not submitted electronically and correspondence related to maintenance
 fees may be addressed to: Mail Stop Maintenance Fee, Director of the United States
 Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.
 

 (e) Patent term extension. All applications for extension of patent
 term under 35 U.S.C. 156 and any communications relating thereto
 intended for the United States Patent and Trademark Office should be additionally
 marked “Mail Stop Hatch-Waxman PTE.” When appropriate, the communication should
 also be marked to the attention of a particular individual, as where a decision
 has been rendered.
 

 (f) [Reserved]

 
 

 
 37 CFR 1.4 Nature of correspondence and signature requirements. 

 
 (a) Correspondence with the Patent and Trademark Office comprises:
 
 (1) Correspondence relating to services and facilities of the
 Office, such as general inquiries, requests for publications supplied by the
 Office, orders for printed copies of patents, orders for copies of records,
 transmission of assignments for recording, and the like, and
 

 (2) Correspondence in and relating to a particular application or other
 proceeding in the Office. See particularly the rules relating
 to the filing, processing, or other proceedings of national applications in
 subpart B of this part; of international applications in subpart C of this
 part; of ex parte reexaminations of patents in subpart D
 of this part; of supplemental examination of patents in subpart E of this
 part; of extension of patent term in subpart F of this part; of
 inter partes reexaminations of patents in subpart H of
 this part; of international design applications in subpart I of this part;
 and of the Patent Trial and Appeal Board in parts 41 and 42 of this
 chapter.
 

 
 

 (b) Since each file must be complete in itself, a separate copy of
 every paper to be filed in a patent, patent file, or other proceeding must be
 furnished for each file to which the paper pertains, even though the contents of
 the papers filed in two or more files may be identical. The filing of duplicate
 copies of correspondence in the file of an application, patent, or other
 proceeding should be avoided, except in situations in which the Office requires
 the filing of duplicate copies. The Office may dispose of duplicate copies of
 correspondence in the file of an application, patent, or other proceeding.
 

 (c) Since different matters may be considered by different branches or
 sections of the Office, each distinct subject, inquiry or order must be contained
 in a separate paper to avoid confusion and delay in answering papers dealing with
 different subjects. Subjects provided for on a single Office or World Intellectual
 Property Organization form may be contained in a single paper.
 

 (d)
 
 (1) Handwritten signature. A design patent practitioner must
 indicate their design patent practitioner status by placing the word
 “design” (in any format) adjacent to their handwritten signature. Each piece
 of correspondence, except as provided in paragraphs (d)(2) through (4), (e)
 and (f) of this section, filed in an application, patent file, or other
 proceeding in the Office that requires a person’s signature, must:
 
 (i) Be an original, that is, have an original handwritten
 signature personally signed, in permanent dark ink or its equivalent,
 by that person; or
 

 (ii) Be a direct or indirect copy, such as a photocopy or
 facsimile transmission ( § 1.6(d) ), of an
 original. In the event that a copy of the original is filed, the
 original should be retained as evidence of authenticity. If a question
 of authenticity arises, the Office may require submission of the
 original.
 

 
 

 (2) S-signature. An S-signature is a signature inserted
 between forward slash marks, but not a handwritten signature as defined by
 paragraph (d)(1) of this section. 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 paragraph
 (d)(1) of this section. Correspondence being filed in the Office in paper,
 by facsimile transmission as provided in § 1.6(d) , or via the
 USPTO patent electronic filing system as an attachment as provided in
 §
 1.6(a)(4) , for a patent application, patent, or a
 reexamination or supplemental examination proceeding may be S-signature
 signed instead of being personally signed (i.e., with a handwritten
 signature) as provided for in paragraph (d)(1) of this section. The
 requirements for an S-signature under this paragraph (d)(2) of this section
 are as follows. 
 
 (i) The S-signature must consist only of letters, or
 Arabic numerals, or both, with appropriate spaces and commas, periods,
 apostrophes, or hyphens for punctuation, and the person signing the
 correspondence must insert his or her own S-signature with a first
 single forward slash mark before, and a second single forward slash
 mark after, the S-signature ( e.g., /Dr. James T.
 Jones, Jr./); and
 

 (ii) A patent practitioner ( §
 1.32(a)(1) ), signing pursuant to
 §
 1.33(b)(1) or (2) , must supply their registration number
 either as part of the S-signature or immediately below or adjacent to
 the S-signature. The hash (#) character may only be used as part of
 the S-signature when appearing before a practitioner’s registration
 number; otherwise, the hash character may not be used in an
 S-signature. A design patent practitioner must additionally indicate
 their design patent practitioner status by placing the word “design”
 (in any format) adjacent to the last forward slash of their
 S-signature.
 

 (iii) The signer’s name must be:
 
 (A) Presented in printed or typed form preferably
 immediately below or adjacent the S-signature, and
 

 (B) Reasonably specific enough so that the identity
 of the signer can be readily recognized.
 

 
 

 
 

 (3) Electronically submitted correspondence. Correspondence
 permitted via the USPTO patent electronic filing system may be signed by a
 graphic representation of a handwritten signature as provided for in
 paragraph (d)(1) of this section or a graphic representation of an
 S-signature as provided for in paragraph (d)(2) of this section when it is
 submitted via the USPTO patent electronic filing system.
 

 (4) Certifications—
 
 (i) Certification as to the paper presented.
 The presentation to the Office (whether by signing, filing,
 submitting, or later advocating) of any paper by a party, whether a
 practitioner or non-practitioner, constitutes a certification under
 §
 11.18(b) of this subchapter. Violations of
 §
 11.18(b)(2) of this subchapter by a party,
 whether a practitioner or non-practitioner, may result in the
 imposition of sanctions under § 11.18(c) of this
 subchapter. Any practitioner violating §
 11.18(b) of this subchapter may also be subject
 to disciplinary action. See § 11.18(d) of this
 subchapter.
 

 (ii) Certifications as to the signature. The person
 inserting a signature under paragraph (d)(2) or (d)(3) of this section
 in a document submitted to the Office certifies that the inserted
 signature appearing in the document is his or her own signature. A
 person submitting a document signed by another under paragraph (d)(2)
 or (d)(3) of this section is obligated to have a reasonable basis to
 believe that the person whose signature is present on the document was
 actually inserted by that person, and should retain evidence of
 authenticity of the signature. Violations of the certification as to
 the signature of another or a person’s own signature as set forth in
 this paragraph may result in the imposition of sanctions under
 §
 11.18(c) and (d) of this chapter.
 

 
 

 (5) Forms. The Office provides forms for the public to use in
 certain situations to assist in the filing of correspondence for a certain
 purpose and to meet certain requirements for patent applications and
 proceedings. Use of the forms for purposes for which they were not designed
 is prohibited. No changes to certification statements on the Office forms
 (e.g., oath or declaration forms, terminal disclaimer forms, petition forms,
 and nonpublication request forms) may be made. The existing text of a form,
 other than a certification statement, may be modified, deleted, or added to,
 if all text identifying the form as an Office form is removed. The
 presentation to the Office (whether by signing, filing, submitting, or later
 advocating) of any Office form with text identifying the form as an Office
 form by a party, whether a practitioner or non-practitioner, constitutes a
 certification under § 11.18(b) of this
 chapter that the existing text and any certification statements on the form
 have not been altered other than permitted by EFS-Web customization.
 

 
 

 (e) [Reserved]

 (f) When a document that is required by statute to be certified must
 be filed, a copy, including a photocopy or facsimile transmission, of the
 certification is not acceptable.
 

 (g) An applicant who has not made of record a registered attorney or
 agent may be required to state whether assistance was received in the preparation
 or prosecution of the patent application, for which any compensation or
 consideration was given or charged, and if so, to disclose the name or names of
 the person or persons providing such assistance. Assistance includes the
 preparation for the applicant of the specification and amendments or other papers
 to be filed in the Patent and Trademark Office, as well as other assistance in
 such matters, but does not include merely making drawings by draftsmen or
 stenographic services in typing papers.
 

 (h) Ratification/confirmation/evidence of authenticity: The Office
 may require ratification, confirmation (which includes submission of a duplicate
 document but with a proper signature), or evidence of authenticity of a signature,
 such as when the Office has reasonable doubt as to the authenticity (veracity) of
 the signature, e.g., where there are variations of a signature,
 or where the signature and the typed or printed name, do not clearly identify the
 person signing.
 

 
 

 
 37 CFR 2.190 Addresses for trademark correspondence with the
 United States Patent and Trademark Office. 

 
 (a) Paper trademark documents. In
 general, trademark documents to be delivered by the USPS must be addressed to:
 Commissioner for Trademarks, P.O. Box 1451, Alexandria, VA 22313-1451.
 Trademark-related documents to be delivered by hand, private courier, or other
 delivery service may be delivered during the hours the Office is open to receive
 correspondence to the Trademark Assistance Center, James Madison Building—East
 Wing, Concourse Level, 600 Dulany Street, Alexandria, Virginia 22314. 
 

 (b) Electronic trademark
 documents. Trademark documents filed electronically must be submitted
 through TEAS. Documents that relate to proceedings before the Trademark Trial and
 Appeal Board must be filed electronically with the Board through ESTTA.
 

 (c) Trademark assignment
 documents. Requests to record documents in the Assignment Recordation
 Branch may be filed electronically through ETAS. Paper documents and cover sheets
 to be recorded in the Assignment Recordation Branch should be addressed as
 designated in § 3.27 of this chapter.
 

 (d) Requests for certified copies of trademark
 documents. Paper requests for certified copies of trademark documents
 must be addressed to: Mail Stop Document Services, Director of the United States
 Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.
 

 (e) Certain documents relating to international
 applications and registrations. International applications under §
 7.11, subsequent designations under § 7.21, responses to notices of irregularity
 under § 7.14, requests to record changes in the International Register under §
 7.23 and § 7.24, requests to note replacements under § 7.28, requests for
 transformation under § 7.31 of this chapter, and petitions to the Director to
 review an action of the Office's Madrid Processing Unit must be addressed to:
 Madrid Processing Unit, 600 Dulany Street, Alexandria, VA 22314-5796.
 

 
 
 I. GENERAL MAILING ADDRESSES The U.S. Patent and Trademark Office (Office) has three separate general
 mailing addresses. The addresses are as follows:
 

 A. For Patent Applications and Patent-Related Papers Correspondence in patent-related matters under the direction of the
 Commissioner for Patents should be addressed to:
 

 Commissioner for Patents
P.O. Box 1450
Alexandria, Virginia 22313-1450

 Such correspondence includes: patent applications, replies to notices
 of informality, requests for extension of time, notices of appeal to the Patent Trial
 and Appeal Board (the Board), briefs in support of an appeal to the Board, requests
 for oral hearing before the Board, applications for extensions of term of patent,
 requests for reexamination, requests for supplemental examination, statutory
 disclaimers, certificates of correction, petitions to the Commissioner for Patents,
 submission of information disclosure statements, petitions to revive abandoned patent
 applications, and other correspondence related to patent applications and patents
 which is processed by organizations reporting to the Commissioner for Patents.
 

 Certain patent-related correspondence requires immediate Office
 attention. Examples are:
 

 
 (A) Petitions for express abandonment to avoid publication under
 37 CFR
 1.138(c) ;
 

 (B) Petitions to withdraw an application from issue under
 37 CFR
 1.313(c) ; 
 

 (C) Petitions to defer issuance of patent under
 37 CFR
 1.314 ;
 

 (D) Request for expedited examination of a design application
 (rocket docket); and
 

 (E) Certain papers required by the Office of Data Management.

 
 Applicants are encouraged to transmit these types of correspondence
 by the USPTO patent electronic filing system (see MPEP § 502.05 ).
 Where permitted, patent-related correspondence that requires immediate Office
 attention may also be submitted to the appropriate area of the Office for processing
 by facsimile transmission (see MPEP § 502.01 , subsections I.B and
 II) or hand-carried (see MPEP § 502 ), subsection III).
 

 B. For Trademark Applications and Trademark-Related Papers All trademark-related documents filed on paper, except documents sent
 to the Assignment Recordation Branch for recordation; requests for copies of
 trademark documents; and certain documents filed under the Madrid Protocol as
 specified in 37 CFR 2.190(e), should be addressed to: 
 

 Commissioner for Trademarks
P.O. Box 1451
Alexandria, VA 22313-1451.

 See 37 CFR 2.190 (reproduced before subsection I, above) for the
 addresses for filing trademark correspondence with the USPTO on paper and
 electronically. 
 

 C. For Other Correspondence Patent and trademark documents sent to the Assignment Recordation
 Branch for recordation (Mail Stop Assignment Recordation Services), requests for
 certified or uncertified copies of patent and trademark documents (Mail Stop Patent
 and Trademark Copy Fulfillment Branch), and for correspondence for which an address
 is not otherwise specified in 37 CFR 1.1 or 2.190, should be
 addressed to:
 

 Director of the United States Patent and Trademark
 Office
P.O. Box 1450
Alexandria, VA 22313-1450

 It is preferred that requests for certified or
 uncertified copies of patent and trademark documents be made online through the
 Certified Copy Center storefront at www.uspto.gov/CertifiedCopyCenter . 
 

 II. SEPARATE MAILING ADDRESSES FOR CERTAIN CORRESPONDENCE The Office has separate mailing addresses for certain
 correspondence:
 

 
 (A) Certain court-related correspondence (e.g., summons and complaint)
 being delivered to the Office via the U.S. Postal Service (USPS) must be
 addressed:
 

 
 General Counsel
United States Patent and Trademark
 Office
P.O. Box 1450
Alexandria, VA 22313-1450

 
 (B) Correspondence directed to the Office of Enrollment and Discipline
 (OED) Director relating to disciplinary proceedings pending before a Hearing
 Officer or the Director must be addressed:
 

 
 Mail Stop 8
Office of the Solicitor
United States Patent and Trademark
 Office
P.O. Box 1450
Alexandria, Virginia 22313-1450

 
 (C) Maintenance fee payments not electronically submitted over the
 Internet and correspondence related to maintenance fees may be addressed to:
 

 
 Mail Stop Maintenance Fee
Director of the United States Patent and Trademark
 Office
P.O. Box 1450
Alexandria, VA 22313-1450

 
 (D) A payment to replenish a deposit account may be addressed to:

 
 Mail Stop Deposit Accounts
Director of the United States Patent and Trademark
 Office
P.O. Box 1450
 Alexandria, VA 22313-1450

 Persons filing correspondence with the Office should check the rules of
 practice, the Official Gazette, or the USPTO website (www.uspto.gov) to determine the
 appropriate mailing address for such correspondence.
 

 III. HAND-DELIVERY OF PAPERS Patent-related papers may be hand-carried to the Office in Alexandria,
 VA. Correspondence cannot be hand-carried to the Regional Offices. If the correspondence
 is hand-carried to the Office, with limited exceptions (see MPEP § 502 , subsection
 III) it must be delivered to:
 

 United States Patent and Trademark
 Office
Customer Service Window
Knox Building
501 Dulany Street
Alexandria, VA 22314

 Trademark-related papers may be filed at the “walk-up” window located in
 the Trademark Assistance Center, Madison East, Concourse Level, Room C55, 600 Dulany
 Street, Alexandria, VA 22314.
 

 As provided in 37 CFR 1.4(c) , matters that are to
 be considered by different branches or sections of the USPTO must be contained in
 separate papers. The following form paragraph may be used to notify the applicant of
 this requirement when the applicant has filed a single paper containing distinct
 subjects, inquiries, or orders.
 

 ¶ 5.01.01 Separate Paper Required

 The [1] submitted
 [2] should have been submitted as a separate paper as required by
 37 CFR
 1.4(c) . The paper has been entered. However, all future correspondence
 must comply with 37 CFR
 1.4 .
 

 Examiner Note:
 
 1. In bracket 1, indicate the item
 required to be separately submitted, such as an affidavit, petition, or other
 appropriate document.
 

 2. If the applicant is a
 pro se inventor, include a copy of the rule.
 
 
 

 Those who correspond with the USPTO are strongly encouraged
 not to include correspondence which will have to be directed
 to different areas (e.g., Patents and Trademarks) of the Office in a single envelope.
 Including multiple papers in a single envelope increases the likelihood that one or more
 of the papers will be delayed before reaching the appropriate area. Placing the papers
 in separately addressed envelopes will reduce the number of actions being performed by
 the USPTO unnecessarily or inappropriately.
 

 Pursuant to 37 CFR 1.1 , non-trademark
 correspondence intended for the USPTO must be mailed to P.O. Box 1450, Alexandria, VA
 22313-1450, except as otherwise provided. Except for certain mail addressed incorrectly
 to the Office of the General Counsel (see 37 CFR 1.1(a)(3)(v) ), there will be
 no penalty for addressing a document to the wrong area within the Office, as long as one
 of the approved addresses is used. Use of the specific addresses listed within
 37 CFR
 1.1 is strongly encouraged because it will facilitate the process
 both for the Office and the filer. Accordingly, a new application incorrectly addressed
 to the Director will be treated the same as if the application was addressed to the
 specific Commissioner.
 

 All mailed communications are received by the Incoming-Mail Section of
 the Office of Patent Application Processing (OPAP), which opens and processes all
 official mail.
 

 Special mail stops have been established to allow the forwarding of
 particular types of correspondence to appropriate areas of the Office as quickly as
 possible. A list of these mail stops is published weekly in the Official
 Gazette. Only the specified type of document for a particular mail stop
 should be placed in an envelope addressed to that mail stop.
 

 If any documents other than the specified type identified for each
 department are addressed to that department, they will be significantly delayed in
 reaching the appropriate area for which they were intended.
 

 [top] 

 

 

 
 

 
 

 

 

 

 
 
 
 501-Filing Papers With the U.S. Patent and Trademark Office 

 502-Depositing Correspondence 
 502.01-Correspondence Transmitted by Facsimile 

 502.02-Correspondence Signature Requirements 

 502.03-Communications via Internet Electronic Mail (email) 

 502.04-Duplicate Copies of Correspondence 

 502.05-Correspondence Transmitted by EFS-Web 

 
 

 503-Application Number and Filing Receipt 

 504-Assignment of Application for Examination 

 505-Date of Receipt Stamp 

 506-Completeness of Original Application 
 506.01-[Reserved] 

 506.02-Review of Refusal To Accord Filing Date 

 
 

 507-Drawing Review in the Office of Patent Application Processing 

 508-Distribution 
 508.01-[Reserved] 

 508.02-Papers Received After Patenting or Abandonment 

 508.03-[Reserved] 

 508.04-Unlocatable Patent or Application Files 

 
 

 509-Payment of Fees 
 509.01-Deposit Accounts 

 509.02-Small Entity Status — Definitions 

 509.03-Claiming Small Entity Status 
 509.03(a)-Duty to Investigate Entitlement to Claim Small Entity Status 

 509.03(b)-Change or Correction of Status 

 
 

 509.04-Micro Entity Status — Definitions 
 509.04(a)-Gross Income Basis for Micro Entity Status 

 509.04(b) -Institution of Higher Education Basis for Micro Entity Status 

 509.04(c) -Parties Who Can Sign the Micro Entity Certification 

 509.04(d) -Continued Obligation to Determine Micro Entity Qualification 

 509.04(e) -Notification of Loss of Entitlement to Micro Entity Status 

 509.04(f) -Correcting Errors in Micro Entity Status 

 
 

 
 

 510-U.S. Patent and Trademark Office Business Hours 

 511-Postal Service Interruptions and Emergencies 

 512-Certificate of Mailing or Transmission 

 513-Deposit as Priority Mail Express® with U.S. Postal Service 

 

 

 
 

 
 
 

 
 

 

 
 
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 Last Modified: 
 
 03/09/2026 20:49:43