City Technology Ltd v. Alphasense Ltd [2000] EWHC Patents 56 (25th October, 2000)

City Technology Ltd v. Alphasense Ltd [2000] EWHC Patents 56 (25th October, 2000)

The defendant's device infringes claims 1, 2, 3, 7-11, and 14 of the patent because the arrangement of the wick and separator, even if not a unitary wick, performs the same function as the claimed invention and falls within the fair scope of the claims when purposively construed. The patent is valid as the claimed...

Source-derived case information.

Citation
[2000] EWHC Patents 56
Parties
Claimant: City Technology Limited; Defendant: Alphasense Limited
Jurisdiction
England and Wales
Procedural Posture
Patent Infringement and Revocation Action / High Court Trial Judgment
Outcome
Claimant succeeds in part; patent held valid and infringed in respect of claims 1, 2, 3, 7-11, and 14; not infringed in respect of claim 13.
Legal Topics
Patent Infringement, Patent Validity, Obviousness, Interpretation of Patent Claims
Intellectual Property Law Patent Law Patent Infringement Patent Validity Obviousness Interpretation of Patent Claims

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Summary, issues, holding and outcome

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Parties

City Technology Limited

Claimant

Alphasense Limited

Defendant

Procedural Posture

Patent Infringement and Revocation Action / High Court Trial Judgment

Legal Issues

  1. 1 Whether the defendant's gas sensors infringe claims 1-3, 7-9, and 11-15 of UK Patent No. 2,094,005
  2. 2 Whether the patent is invalid for obviousness or lack of inventive step in light of prior art (US Patent No. 3,755,125 and common general knowledge)
  3. 3 Proper construction of the claims, particularly the meaning of 'wick' and the requirements of claim 13

Ratio Decidendi

The defendant's device infringes claims 1, 2, 3, 7-11, and 14 of the patent because the arrangement of the wick and separator, even if not a unitary wick, performs the same function as the claimed invention and falls within the fair scope of the claims when purposively construed. The patent is valid as the claimed arrangement is not obvious in light of Shaw or common general knowledge; the concept of a wick passing through an opening in a hydrophobic support is a novel and non-obvious solution to the problem addressed.

Court Disposition

Claimant succeeds in part; patent held valid and infringed in respect of claims 1, 2, 3, 7-11, and 14; not infringed in respect of claim 13.

Orders

  • Declaration of infringement of claims 1, 2, 3, 7-11, and 14 by the defendant's device
  • Declaration of validity of claim 1 and all appendant claims