Patent Marking Notice
The statutory practice of marking patented articles to give constructive notice of patent rights, which controls how far back damages can be recovered.
Patent marking allows a patentee to give the public constructive notice of its patent rights by marking patented articles with the patent number, or since the America Invents Act, with a web address that lists the applicable patents (virtual marking). Marking is not mandatory, but it has significant consequences for damages.
If a patentee fails to mark its patented products, or marks incompletely, damages are generally limited to the period after the infringer received actual notice, such as through a specific accusation of infringement, rather than running from the date infringement actually began. Method claims, which cover no tangible article to mark, are typically not subject to this marking requirement at all. False marking of unpatented or expired products carries its own separate risks.
In a simulation, marking compliance functions as a gating variable on the damages-window dial: a user can toggle marking status and see how much of the infringement period even counts toward the damages calculation before the base royalty or lost-profits figures are applied.
How it actually shows up
Patentees periodically audit their marking practices, especially after product changes or new patent issuances, to preserve the full damages period available to them. Litigators investigating a marking failure raise it as a threshold, damages-limiting defense that can significantly shrink exposure even where infringement itself is not seriously disputed.
- What happens if a patentee never marks its products?
- Damages are generally limited to the period after the infringer received actual notice of the specific patent and infringement, rather than the full period infringement actually occurred.
- What is virtual marking?
- Marking a product with a web address that lists the patents covering it, instead of physically stamping individual patent numbers on the product itself, a practice authorized by the America Invents Act.
- Does the marking requirement apply to method claims?
- Generally no, since there is no tangible article to mark; the marking statute is understood to apply to patented tangible items rather than pure process or method claims.
This page is an educational explainer, not legal advice, and creates no attorney–client relationship. Juricratic is a simulation engine: every probability-like figure is a dial you set, not a calibrated prediction. Verify every rule, deadline, and figure against the authorities and orders that govern your matter.
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