The Nesbit Evans Group Australia Pty Ltd v Impro Ltd [1997] FCA 1092

The Nesbit Evans Group Australia Pty Ltd v Impro Ltd [1997] FCA 1092

The claims of the patent (particularly 6 and 11) require only that the lifting arm radius be functionally comparable to the length of a human thigh bone—precision or identity is not required; an approximate parallelogram action suffices, and the presence of some horizontal force at the knees does not avoid infringement. The appellant's devices fell within the scope of the claims as properly construed. The grounds for invalidity, including ambiguity, fair basing, inutility, insufficient description, and misrepresentation, were not made out on the evidence or on the construction of the patent claims.

Jurisdiction
Australia
Judgment Date
22 October 1997
Procedural Posture
Appeal / Decision on Appeal From a Judge of the Federal Court of Australia
Outcome
Appeal dismissed with costs.
Legal Topics
['infringement of Patent' 'construction of Patent Claims' 'validity of Patent' 'revocation of Patent' 'ambiguity' 'fair Basing' 'inutility' 'false Suggestion or Misrepresentation']
['intellectual Property' 'patents'] ['infringement of Patent' 'construction of Patent Claims' 'validity of Patent' 'revocation of Patent' 'ambiguity' 'fair Basing' 'inutility' 'false Suggestion or Misrepresentation']

Case Brief

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Procedural Posture

Appeal / Decision on Appeal From a Judge of the Federal Court of Australia

Legal Issues

  1. 1 ["Whether the appellant's devices infringed claims 6 and 11 of the subject patent." "How the claims of the patent, specifically the phrases 'parallelogram of forces', 'absence of forward horizontal force', and 'radius comparable to the average length of a human thigh bone', are to be construed." 'Whether the patent claims were invalid or unenforceable due to lack of fair basing, ambiguity, inutility, insufficient description, or misrepresentation.']

Ratio Decidendi

The claims of the patent (particularly 6 and 11) require only that the lifting arm radius be functionally comparable to the length of a human thigh bone—precision or identity is not required; an approximate parallelogram action suffices, and the presence of some horizontal force at the knees does not avoid infringement. The appellant's devices fell within the scope of the claims as properly construed. The grounds for invalidity, including ambiguity, fair basing, inutility, insufficient description, and misrepresentation, were not made out on the evidence or on the construction of the patent claims.

Court Disposition

Appeal dismissed with costs.

Orders

  • ['The appeal be dismissed.' "The appellant pay the respondents' costs of the appeal."]