TQ Delta, LLC v ZYXEL Communications Ltd & Anor

TQ Delta, LLC v ZYXEL Communications Ltd & Anor

The 268 Patent is valid and infringed: the prior art (Alabama) did not render the claims obvious or anticipated, as it did not teach or make obvious the claimed method of specifying which mux data frames contain overhead bits via a parameter. The 430 Patent is invalid for obviousness: once the problem of inconsistent SES reporting due to variable CRC computation periods was perceived (which was obvious from ADSL2/02 and common general knowledge), the claimed normalisation solution was itself obvious. Both patents would be essential to the relevant standards if valid; only the 268 Patent is both valid and infringed.

Parties
Claimant: TQ Delta, LLC; Defendant: ZyXEL Communications Limited; Defendant: ZyXEL; Defendant: ZyXEL Communications A/S
Jurisdiction
England and Wales
Judgment Date
11 March 2019
Procedural Posture
Patent Infringement and Validity Trial / Judgment After Technical Trial on Validity and Infringement
Outcome
268 Patent: Valid and infringed. 430 Patent: Invalid for obviousness. Conditional amendment to 268 Patent not required. If 430 Patent had been valid, it would have been infringed.
Legal Topics
Patent Validity, Patent Infringement, Obviousness, Anticipation, Claim Construction, Technical Contribution, Standard Essential Patents
Intellectual Property Patents Patent Validity Patent Infringement Obviousness Anticipation Claim Construction Technical Contribution +1 more

Case Brief

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Parties

TQ Delta, LLC

Claimant

ZyXEL Communications Limited

Defendant

ZyXEL

Defendant

ZyXEL Communications A/S

Defendant

Procedural Posture

Patent Infringement and Validity Trial / Judgment After Technical Trial on Validity and Infringement

Legal Issues

  1. 1 Whether EP 1 453 268 ('268 Patent') is valid and infringed
  2. 2 Whether EP 1 792 430 ('430 Patent') is valid and infringed
  3. 3 Proper construction of key claim terms ('frame', 'specifies', 'nmax', 'normalising')

Ratio Decidendi

The 268 Patent is valid and infringed: the prior art (Alabama) did not render the claims obvious or anticipated, as it did not teach or make obvious the claimed method of specifying which mux data frames contain overhead bits via a parameter. The 430 Patent is invalid for obviousness: once the problem of inconsistent SES reporting due to variable CRC computation periods was perceived (which was obvious from ADSL2/02 and common general knowledge), the claimed normalisation solution was itself obvious. Both patents would be essential to the relevant standards if valid; only the 268 Patent is both valid and infringed.

Court Disposition

268 Patent: Valid and infringed. 430 Patent: Invalid for obviousness. Conditional amendment to 268 Patent not required. If 430 Patent had been valid, it would have been infringed.

Orders

  • Declaration that EP 1 453 268 is valid and infringed by ZyXEL
  • Declaration that EP 1 792 430 is invalid for obviousness