A Blog About Intellectual Property Litigation and the District of Delaware


Entries for tag: Marking

It Depends

Nathan R. Hoeschen, Jan. 22, 2026
Marking

It's usually easy to spot a dependent claim. They will immediately go to the first person they know at a party and follow them around for the whole evening. They text too much. They may boil your pet rabbit.

They also usually begin with something like "the compound of claim one, wherein the R1 group is cocktail sauce or raspberry jam"

Would you believe we already had this image saved for some reason?
Would you believe we already had this image saved for some reason? AI-Generated, displayed with permission

But what do you make of a claim like this?

A method of performing an assay that monitors cell-substrate impedance, comprising: providing the system of claim 1;
introducing cells into at least one well of said system;
monitoring cell-substrate impedance of said at …
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Patent Marking: Better Watch Those Burdens of Proof, or You'll Lose Your Pre-Suit Damages

Andrew E. Russell, Sept. 30, 2022
Summary Judgment Pre-Suit Damages

Here's an AI-generated patentee dealing with the burden of proof on marking.
Here's an AI-generated patentee dealing with the burden of proof on marking. AI-Generated, displayed with permission

My co-blogger Nate wrote yesterday about Magistrate Judge Hall's discussion of prior art estoppel in Innovative Memory Systems Inc. v. Micron Technology Inc., No. 14-1480-RGA (D. Del. Sept. 29, 2022). That was actually just one issue the Court dealt with in a lengthy R&R and Order on a summary judgment and Daubert. I wanted to post about one of the other issues Judge Hall addressed in that opinion: patent marking.

Marking is an important and sometimes underrated issue. It's not uncommon, in patent cases, for the bulk of the damages to have accrued in the years prior to the plaintiff filing suit. These "pre-suit" damages can be at risk, though, if the patentee sold products that practice the patent and failed to mark them under 35 U.S.C. § 287(a). Here is how Judge Hall explained it in Innovative Memory:

[W]hen a plaintiff makes or sells a product practicing its patent, the plaintiff can only recover pre-suit damages from an infringer if (1) the patentee marked its product in the manner specified in § 287(a) or (2) the patentee notified the infringer of its infringement. Even if a plaintiff patentee doesn’t make or sell anything, it cannot recover pre-suit damages (absent providing notice) if a prior owner of the patent failed to mark its products covered by the patent.

One interesting thing about marking, ...

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The Intersection of Marking and Pleading

Nathan R. Hoeschen, June 10, 2021
FRCP 12 FRCP 12(c)

It's fairly common for plaintiffs in Delaware to plead infringement by alleging that the defendant infringes "at least claim x," of the relevant patent—leaving the question of what other claims might be asserted until later in the case.

In line with the Federal Circuit decision in Disc Disease Sols. Inc. v. VGH Sols., Inc., 888 F.3d 1256, 1260 (Fed. Cir. 2018), many of our Delaware judges have explicitly endorsed this practice. See, e.g. Promos Techs., Inc. v. Samsung Elecs. Co., Civil Action No. 18-307-RGA, 2018 U.S. Dist. LEXIS 186276, at *6 (D. Del. Oct. 31, 2018) ("Plaintiff does provide details of at least one claim allegedly infringed under each asserted patent. Therefore, Plaintiff's identification of infringed …

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Judge Connolly Sets Out His Views on Expediting "Silver Bullet" Motions, Including Indefiniteness

Andrew E. Russell, Nov. 6, 2020
Marking Early SJ

Wolf
Wolf in the Forest, Philipp Pilz, Unsplash

I don't have the full transcript, but based on quotes set out in a letter filed by the parties, Judge Connolly recently set forth his thoughts on the kinds of issues he is willing to address early in the case:

Now, what I try to do when I think there's kind of a silver bullet, I move it to the top of the pile. That's what I do on indefiniteness.

According to the letter, Judge Connolly was prepared to stay the case and expedite summary judgment briefing on indefiniteness if it was case dispositive. Defendant declined that offer in a letter after the hearing.

Judge Connolly also suggested that he …

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