600 Parts, Form, and Content of Application

no claim needed to establish a filing date now

As far as I understand, right now no claim is required to establish a filing date. But search around "at least one claim" on chapter 600, you still get a few such old descriptions.

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MPEP Edition 9 - March 2014

100 Secrecy, Access, National Security, and Foreign Filing

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200 Types, Cross-Noting, and Status of Application

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300 Ownership and Assignment

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400 Representative of Applicant or Owner

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500 Receipt and Handling of Mail and Papers

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600 Parts, Form, and Content of Application

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700 Examination of Applications

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800 Restriction in Applications Filed Under 35 U.S.C. 111; Double Patenting

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900 Prior Art, Classification, and Search

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1000 Matters Decided by Various U.S. Patent and Trademark Office Officials

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1100 Statutory Invention Registration (SIR); Pre-Grant Publication (PGPub) and Preissuance Submissions

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1200 Appeal

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1300 Allowance and Issue

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1400 Correction of Patents

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1500 Design Patents

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1600 Plant Patents

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1700 Miscellaneous

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1800 Patent Cooperation Treaty

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1900 Protest

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2000 Duty of Disclosure

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2100 Patentability

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2200 Citation of Prior Art and Ex Parte Reexamination of Patents

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2300 Interference Proceedings

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2400 Biotechnology

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2500 Maintenance Fees

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2600 Optional Inter Partes Reexamination

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2700 Patent Terms and Extensions

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2800 Supplemental Examination

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MPEP Other

Appendix T Patent Coorperation Treaty

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MISCELLANEOUS - Appendices and Other

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