Sullivan & Cromwell LLP Logo Sullivan & Cromwell LLP Logo
  • Lawyers
  • Practices
  • Insights
  • About
  • Careers
  • Alumni
  • Twitter icon
  • LinkedIn icon
  •  icon
  • Podcasts icon
© 2026 Sullivan & Cromwell LLP
    • Home
    • Lawyers
    • Practices
    • Insights
    • About
    • Careers
    • Alumni
    Home /  About /  News and Events /  Client Highlights
    Client Highlights

    S&C Prevails for Perfect Day in Patent Dispute

    • Our Lawyers
    • Related Practices
    July 16, 2024

    Perfect Day, an innovator in developing sustainable protein products using precision fermentation, prevailed in a third-party requested reexamination of one of its cornerstone patents before the U.S. Patent and Trademark Office. Perfect Day’s flagship product, the world’s first precision-fermented milk protein, is used in animal-free dairy products, including ice cream, cream cheese and baked goods.

    The S&C team overcame the patent examiner’s initial rejection of all claims of the patent and convinced the examiner to allow those claims in March 2024. The team submitted a lengthy and detailed response to the examiner’s initial rejection, successfully explaining in detail the patent’s innovations and why they provided substantial improvements over prior work in the field.

    The S&C team representing Perfect Day included Andrei Iancu, Stephen Elliott and Brittany Bruns.

    Read More
    Stay Updated

    Subscribe to stay current on S&C Insights.

    Our Lawyers

    Our Lawyers

    Andrei Iancu Headshot Photo
    Andrei Iancu
    Los Angeles
    +1-310-712-6600
    Email
    vCard
    Stephen J. Elliott Headshot Photo
    Stephen J. Elliott
    New York
    +1-212-558-7446
    Email
    vCard
    Read More

    Related Practices

    • Intellectual Property & Technology Litigation
    • Litigation
    Sullivan & Cromwell LLP Logo Sullivan & Cromwell LLP Logo
    • Twitter icon
    • LinkedIn icon
    • RSS Feed icon
    • Podcasts icon
    • Contact Us
    • Cookies
    • Privacy & Disclaimers
    • Attorney Advertising
    © 2026 Sullivan & Cromwell LLP