Law.com Subscribers SAVE 30%

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

The New 'Material Effect' Test

By Otis Littlefield
October 02, 2003

In Bayer AG v. Schein Pharm., Inc., 301 F.3d 1306 (Fed. Cir. 2002), the Federal Circuit articulated a new 'material effect' test for the best mode requirement. The court affirmed the validity of a patent covering the antibiotic drug ciprofloxacin on the grounds that it properly claimed priority to a parent application that satisfied the best mode requirement. With the priority date of the parent application, the patent was not invalidated under section 102(d) by an earlier filed foreign patent. The three-judge panel agreed that the parent application met the best mode requirement; however, the panel disagreed as to why the best mode requirement was satisfied. The majority reviewed the prior case law and found 'that the best mode of making and using the invention need be disclosed if it materially affects the properties of the claimed invention.' Id. at 1319-1320. Judge Radar concurred in the result, but strenuously objected to the creation of this additional criterion.

Majority Opinion

This premium content is locked for Entertainment Law & Finance subscribers only

  • Stay current on the latest information, rulings, regulations, and trends
  • Includes practical, must-have information on copyrights, royalties, AI, and more
  • Tap into expert guidance from top entertainment lawyers and experts

For enterprise-wide or corporate acess, please contact Customer Service at [email protected] or 877-256-2473

Read These Next
New York's Latest Cybersecurity Commitment Image

On Aug. 9, 2023, Gov. Kathy Hochul introduced New York's inaugural comprehensive cybersecurity strategy. In sum, the plan aims to update government networks, bolster county-level digital defenses, and regulate critical infrastructure.

Law Firms are Reducing Redundant Real Estate by Bringing Support Services Back to the Office Image

A trend analysis of the benefits and challenges of bringing back administrative, word processing and billing services to law offices.

Bit Parts Image

Summary Judgment Denied Defendant in Declaratory Action by Producer of To Kill a Mockingbird Broadway Play Seeking Amateur Theatrical Rights

The Bankruptcy Hotline Image

Recent cases of importance to your practice.

How AI Has Affected PR Image

When we consider how the use of AI affects legal PR and communications, we have to look at it as an industrywide global phenomenon. A recent online conference provided an overview of the latest AI trends in public relations, and specifically, the impact of AI on communications. Here are some of the key points and takeaways from several of the speakers, who provided current best practices, tips, concerns and case studies.