filing date

出願日。明細書がUSPTOに受理された日。クレームが含まれていることは必須条件ではない（35 U.S.C. 111(a)(4)、111(b)(4)）。

35 U.S.C. 111(a)(4)
FILING DATE.
The filing date of an application shall be the date on which a specification, with or without claims, is received in the United States Patent and Trademark Office.

35 U.S.C. 111(b)(4)
FILING DATE.
The filing date of a provisional application shall be the date on which a specification, with or without claims, is received in the United States Patent and Trademark Office.