Sudarshan Chemical Industries Ltd v Clariant Produkte (Deutschland) GmbH

Sudarshan Chemical Industries Ltd v Clariant Produkte (Deutschland) GmbH

The Court of Appeal held that claims 6-8 of the 338 patent, and all proposed amendments, were invalid for obviousness over the 517 patent, as the prior art disclosed the beta polymorph in wet cake form and it was obvious to use it for pigmenting polymers. The proposed amendments (claims 12, 13, disclaimer) were either obvious or not allowable for adding matter or ambiguity. Clariant's threats were actionable as they extended to Sudarshan's customers and Clariant had reason to suspect invalidity based on knowledge within the company.

Parties
Claimant/respondent: Sudarshan Chemical Industries Ltd; Defendant/appellant: Clariant Produkte (Deutschland) GmbH
Jurisdiction
England and Wales
Judgment Date
30 July 2013
Procedural Posture
Civil Appeal (patents) / Appeal From High Court (patents Court) to Court of Appeal
Outcome
Appeal dismissed. Judgment of the High Court upheld.
Legal Topics
Patent Validity, Obviousness, Groundless Threats, Patent Amendment, Product/process Claims, Added Matter, Disclaimer in Patent Claims
Intellectual Property Law Patent Law Patent Validity Obviousness Groundless Threats Patent Amendment Product/process Claims Added Matter +1 more

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Parties

Sudarshan Chemical Industries Ltd

Claimant/respondent

Clariant Produkte (Deutschland) GmbH

Defendant/appellant

Procedural Posture

Civil Appeal (patents) / Appeal From High Court (patents Court) to Court of Appeal

Legal Issues

  1. 1 Whether claims 6-8 of EP 1 170 338 are invalid for obviousness over prior art (US 5,047,517)
  2. 2 Whether proposed amendments (claims 6-13, disclaimer) are allowable under patent law
  3. 3 Whether Clariant made actionable groundless threats under s.70 of the Patents Act 1977

Ratio Decidendi

The Court of Appeal held that claims 6-8 of the 338 patent, and all proposed amendments, were invalid for obviousness over the 517 patent, as the prior art disclosed the beta polymorph in wet cake form and it was obvious to use it for pigmenting polymers. The proposed amendments (claims 12, 13, disclaimer) were either obvious or not allowable for adding matter or ambiguity. Clariant's threats were actionable as they extended to Sudarshan's customers and Clariant had reason to suspect invalidity based on knowledge within the company.

Court Disposition

Appeal dismissed. Judgment of the High Court upheld.

Orders

  • Patent EP 1 170 338 declared invalid as to claims 6-8 and all proposed amendments.
  • Relief for groundless threats granted to Sudarshan.