comment is stripped before output, but it is one typo away from an HTML comment that is not, so served templates carry no private paths at all. */}}
Continuation Drafter
Continuation practice · Tier D

An infringed patent can still be unenforceable

Personalized Media v. Apple

Laches is not about elapsed time alone. It is about a delay a court will call unreasonable, plus prejudice traceable to it, and a deliberate strategy is what makes delay look unreasonable.

How to read the ledger below. Each numbered point carries the kind of evidence behind it. ESTABLISHED is stated in the authority's own text, with a locator. IMPLEMENTED is the rule as the authority actually applied it. OBSERVED is carried by a source outside this one. ASSUMED is the drafter's inference, flagged as such and not the authority speaking. Quotations are checked against a cached copy of the primary source by script.

In one paragraph

The Federal Circuit affirmed the district court in Personalized Media Communications v. Apple on 20 January 2023 and held that a patent a jury had already found infringed was unenforceable for prosecution laches, because the patentee delayed unreasonably and inexcusably under the totality of the circumstances as part of a business driven prosecution strategy, and because Apple suffered prejudice traceable to that delay. Laches has 2 elements and the court reviewed the finding only for abuse of discretion, so the decision sets no safe interval.

Reader summary

A jury found Apple's FairPlay technology infringed. The patent was then held unenforceable anyway, on prosecution laches, after a bench trial. That sequence is the point of the record: laches operates on the right to enforce, not on validity, and it can take away a win already obtained.

The court states the test in two elements. The delay must be unreasonable and inexcusable under the totality of the circumstances, and the accused infringer must have suffered prejudice attributable to that delay. Both are required.

What made the delay unreasonable here was not its length in the abstract but that it was strategic. The court describes a business-driven prosecution strategy, and reads the parties' consolidation agreement in that light. The prejudice was underscored by the fact that the accused technology, developed during the interval, was found to infringe.

The patentee's own framing of its appeal is worth noting, because it shows how the argument runs in practice: it said its conduct looked nothing like Hyatt or the handful of other cases finding laches. The court disagreed. That is a fact-bound comparison, and the pair record google-v-sonos is the case where a comparable argument succeeded.

Why this matters when you are drafting

Enforceability is a separate exposure from validity, and it survives a jury win. Claim 3. A family can be valid, infringed, and unenforceable. Any assessment of continuation risk that stops at validity is incomplete.

The finding attaches to strategy, not to the calendar. Claim 5 is the operative point. A long family is not by itself the problem; a long family whose length is explained by a business-driven plan to capture later-developed technology is. What a file history reveals about why claims were pursued when they were is therefore part of the risk.

Prejudice needs a link, and intervening development supplies it. Claim 6. The clearest prejudice case is an accused technology built during the delay, which is precisely the shape of a continuation asserted against a product that emerged after the parent issued.

Do not read a safe interval out of this case. Claim 8. It is abuse-of-discretion review of an equitable finding. The pair record google-v-sonos shows the same doctrine producing the opposite result, and the difference is the facts, not the passage of years.

What the authority establishes

  1. [ESTABLISHED, the two-element test] "Prosecution laches requires proving two elements: (1) the patentee's delay in prosecution must be unreasonable and inexcusable under the totality of circumstances and (2) the accused infringer must have suffered prejudice attributable to the delay." (P. 9.)
  1. [ESTABLISHED, the disposition] "Because the district court did not abuse its discretion in finding the patent unenforceable, we affirm." (P. 2.) Review is for abuse of discretion, which is why this record states an outcome rather than a threshold.
  1. [ESTABLISHED, the posture that makes this record matter] The district court "found the '091 patent unenforceable based on prosecution laches" after a bench trial on remaining issues. (P. 3.) Enforceability was decided separately from, and after, infringement.
  1. [ESTABLISHED, the standard as the district court applied it] Relying on Hyatt, "the court determined that laches required a challenger to prove that the applicant's delay was unreasonable and inexcusable under the totality of the circumstances and that there was prejudice attributable to the delay". (P. 3.)
  1. [ESTABLISHED, what made the delay unreasonable] "The court explained that the Consolidation Agreement had to be understood in the context of PMC's business-driven, unreasonable prosecution strategy." (P. 5.) Strategy, not duration, is what the finding rests on.
  1. [ESTABLISHED, how prejudice was established] "This scheme contributed to the prejudice, which was underscored by the fact that a jury found that Apple's FairPlay technology infringed the '091 patent." (P. 9.) Intervening development of the accused technology is what links delay to harm.
  1. [ESTABLISHED, the argument that failed, and it is the natural one] "PMC argues legal error because its 'conduct looks nothing like Hyatt or the handful of other cases that have found prosecution laches.'" (P. 10.) Distinguishing the small set of laches cases is the standard move; here it did not work.
  1. [IMPLEMENTED, laches is an equitable, fact-bound determination reviewed deferentially] Claims 2 and 4 together mean this opinion affirms a discretionary call rather than setting a rule about how long is too long. A practitioner cannot derive a safe interval from it.
  1. [ASSUMED, drafter's inference, flagged as such] The doctrine bites hardest exactly where continuation practice is most valuable: keeping an application pending while a market develops. The opinion does not frame it as a tension with continuation strategy; this follows from claims 5 and 6, where the strategy and the intervening development are what supply both elements.

Quotations, verified against the source

All from the Federal Circuit's opinion. Page locators computed from the docket stamp.

  • "Because the district court did not abuse its discretion in finding the patent unenforceable, we affirm." (P. 2.)
  • "found the '091 patent unenforceable based on prosecution laches" (P. 3.)
  • "the court determined that laches required a challenger to prove that the applicant's delay was unreasonable and inexcusable under the totality of the circumstances and that there was prejudice attributable to the delay" (P. 3.)
  • "The court explained that the Consolidation Agreement had to be understood in the context of PMC's business-driven, unreasonable prosecution strategy." (P. 5.)
  • "Prosecution laches requires proving two elements: (1) the patentee's delay in prosecution must be unreasonable and inexcusable under the totality of circumstances and (2) the accused infringer must have suffered prejudice attributable to the delay." (P. 9.)
  • "This scheme contributed to the prejudice, which was underscored by the fact that a jury found that Apple's FairPlay technology infringed the '091 patent." (P. 9.)
  • "conduct looks nothing like Hyatt or the handful of other cases that have found prosecution laches." (P. 10.)

Tensions and open questions

No threshold is stated and none can be derived. Claims 2 and 8. The opinion reviews for abuse of discretion, so it tells a practitioner that this delay was unreasonable on these facts, not what delay would be.

"Business-driven" is doing heavy lifting without definition. Claim 5 treats commercial motivation as aggravating. Almost all prosecution is commercially motivated, so where ordinary strategy becomes unreasonable strategy is unresolved here.

The relationship to the fee structure is not addressed. Tier D also carries the continuing application fees, which impose a monetary cost on long pendency. Whether paying those surcharges bears on the reasonableness of delay is not something this opinion considers.

What this record does and does not cover

The prosecution-laches analysis, its two elements and the prejudice discussion were read end to end, because they are the reason this record exists.

What was NOT read closely, and is therefore outside what this record can support: the technical subject matter, the infringement and claim-construction analysis, and the detail of the Consolidation Agreement. This record says nothing about why the jury found infringement, only that it did and that the finding bore on prejudice. Hyatt is known here only through this opinion's use of it, and has its own record.

Currency

This record was verified against its primary source on 2026-08-15. That is a fidelity check: the quotations, locators and attribution are accurate to that source. Whether the authority has since been narrowed, distinguished, abrogated or reversed has not been checked here. Confirm it still stands before relying on it.