TQ Delta, LLC v ZYXEL Communications Ltd & Anor

TQ Delta, LLC v ZYXEL Communications Ltd & Anor

The 268 Patent is valid and infringed because Alabama did not disclose or render obvious the claimed method of specifying which mux data frames contain overhead bits via a parameter; the 430 Patent is invalid as its claimed normalisation method was obvious in light of the ADSL2/02 standard, which made the problem apparent to the skilled person and the solution was routine.

Parties
Claimant: TQ Delta, LLC; Defendant: ZyXEL Communications Limited; Defendant: ZyXEL Communications A/S
Jurisdiction
England and Wales
Judgment Date
11 March 2019
Procedural Posture
Patent Infringement and Validity / Judgment After Technical Trial
Outcome
268 Patent valid and infringed; 430 Patent invalid for obviousness
Legal Topics
Patent Validity, Patent Infringement, Obviousness, Anticipation, Claim Construction, Telecommunications Standards
Intellectual Property Patents Patent Validity Patent Infringement Obviousness Anticipation Claim Construction Telecommunications Standards

Case Brief

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Parties

TQ Delta, LLC

Claimant

ZyXEL Communications Limited

Defendant

ZyXEL Communications A/S

Defendant

Procedural Posture

Patent Infringement and Validity / Judgment After Technical Trial

Legal Issues

  1. 1 Whether the 268 Patent is valid and infringed
  2. 2 Whether the 430 Patent is valid and infringed
  3. 3 Proper construction of claims in the 268 and 430 Patents

Ratio Decidendi

The 268 Patent is valid and infringed because Alabama did not disclose or render obvious the claimed method of specifying which mux data frames contain overhead bits via a parameter; the 430 Patent is invalid as its claimed normalisation method was obvious in light of the ADSL2/02 standard, which made the problem apparent to the skilled person and the solution was routine.

Court Disposition

268 Patent valid and infringed; 430 Patent invalid for obviousness

Orders

  • Declaration that the 268 Patent is valid and infringed by ZyXEL
  • Declaration that the 430 Patent is invalid for obviousness