To determine the earliest effective filing date of a US patent application: Can the filing date of an abandoned US patent application be the effective filing date? Example US 9,220,781 B2 (application no 14/799,211): [https://patentcenter.uspto.gov/#!/applications/14799211/continuity][1]

Filing or 371 (c) date 07/14/2015

14/799,211 is a Continuation of 14/558,182 12/1/2014 Patented 9,114,166

14/558,182 is a Continuation of 14/453,490 8/5/2014 Patented 8,916,158

14/453,490 is a Continuation of 14/322,581 7/1/2014 Patented 8,911,741

14/322,581 is a Continuation of 14/091,938 11/26/2013 Patented 8,795,670

14/091,938 is a Continuation of 13/471,820 5/14/2012 Patented 8,932,591

13/471,820 is a Continuation of 10/525,292 10/26/2005 - 8,216,583

10/525,292 is a National Stage Entry of PCT/IB2003/004502 8/14/2003 - - -

PCT/IB2003/004502 is a Continuation of 10/222,140 8/15/2002 Abandoned -

Is 8/15/2002 of US patent application 10/222,140 the effective filing date?


As long as there is continuity of applications with overlapping pendency the outcome of the applications doesn't matter.

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  • It seems you've used the phrase "doesn't matter" twice in the same sentence. Perhaps you could edit for clarity? – Eric S Nov 13 at 20:27
  • Despite the list of continuations the 371 (c) date is 07-14-2015. Should I assume the patent is in force for 20 years from that date? – Eric S Nov 14 at 18:39
  • No - 20 years from the PCT filing date. From USPTO "A patent granted on an international application filed on or after June 8, 1995 and which enters the national stage under 35 U.S.C. 371 will have a term which ends twenty years from the filing date of the international application. A continuation or a continuation-in-part application claiming benefit under 35 U.S.C. 365(c) of an international application filed under 35 U.S.C. 363 designating the United States will have a term which ends twenty years from the filing date of the parent international application. " – George White Nov 14 at 20:04

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