Law.com Subscribers SAVE 30%

Call 855-808-4530 or email [email protected] to receive your discount on a new subscription.

Foreseeability as a Bar to Proof of Patent Infringement

BY Tim L. Burgess
May 01, 2003

The doctrine of equivalents is a rule of equity adopted more than 150 years ago by the U.S. Supreme Court. Prosecution history estoppel is a rule of equity that controls access to the doctrine. In May 2002, the Court was called upon to revisit the doctrine and the estoppel rule in Festo Corp. v. Shoketsu Kinzoku Kogyo Kabushiki Co. Ltd. Ultimately the Court reaffirmed the doctrine and expanded the estoppel rule, but not without inciting heated debate over the Court's rationale ' especially since it included a new and controversial foreseeability test in its analysis for estoppel.

Under the doctrine, where an element of a product or process accused of patent infringement is not literally described by the express terms of a patent claim limitation, the element nevertheless may be found to infringe if there is equivalence between the element of the accused product or process and the claim limitation of the patented invention.

There is equivalence if the allegedly infringing element of the accused product performs substantially the same function in substantially the same way to obtain substantially the same result. That is, there is equivalence if the not- literally-infringing element is only insubstantially different from the original element.

Read These Next
Yachts, Jets, Horses & Hooch: Specialized Commercial Leasing Models Image

Defining commercial real estate asset class is essentially a property explaining how it identifies — not necessarily what its original intention was or what others think it ought to be. This article discusses, from a general issue-spot and contextual analysis perspective, how lawyers ought to think about specialized leasing formats and the regulatory backdrops that may inform what the documentation needs to contain for compliance purposes.

Hyperlinked Documents: The Latest e-Discovery Challenge Image

As courts and discovery experts debate whether hyperlinked content should be treated the same as traditional attachments, legal practitioners are grappling with the technical and legal complexities of collecting, analyzing and reviewing these documents in real-world cases.

Identifying Your Practice's Differentiator Image

How to Convey Your Merits In a Way That Earns Trust, Clients and Distinctions Just as no two individuals have the exact same face, no two lawyers practice in their respective fields or serve clients in the exact same way. Think of this as a "Unique Value Proposition." Internal consideration about what you uniquely bring to your clients, colleagues, firm and industry can provide untold benefits for your law practice.

Risks and Ad Fraud Protection In Digital Advertising Image

The ever-evolving digital marketing landscape, coupled with the industry-wide adoption of programmatic advertising, poses a significant threat to the effectiveness and integrity of digital advertising campaigns. This article explores various risks to digital advertising from pixel stuffing and ad stacking to domain spoofing and bots. It will also explore what should be done to ensure ad fraud protection and improve effectiveness.

Turning Business Development Plans Into Reality Image

This article offers practical insights and best practices to navigate the path from roadmap to rainmaking, ensuring your business development efforts are not just sporadic bursts of activity, but an integrated part of your daily success.