A new analysis from IPWatchdog highlights a recurring problem in continuation-in-part (CIP) patent practice: inventors can be forced to argue against their own earlier disclosures. If a priority application is published more than a year before a CIP filing, that publication can be used as prior art against claims containing new matter, even though the inventor never surrendered possession of the original elements. The result, the author says, is that inventors end up fighting themselves before the USPTO.
The proposed solution is to change how effective filing dates are assigned within a single claim. Instead of giving the entire claim one effective filing date, the USPTO would give each claim element the benefit of the parent's filing date if the parent supports that element under 35 U.S.C. § 112(a). That would prevent the parent publication from being cited as prior art against the supported elements, while still allowing the claim as a whole to be examined for enablement, written description, and obviousness.
The author acknowledges this would require Congress to amend Sections 100(i) and 120, and that courts and the USPTO have long refused to split priority dates within a claim. Skeptics argue that a mixed CIP claim is only possessed in its entirety as of the CIP filing date. The author rejects that view, arguing that inventions are only ever "stewarded at instances in time" and that patent applications are snapshots, not complete possessions. No other sources were cited, so the piece reflects only the author's argument.{