B. V. D. Company v. Canadian Celanese Ltd.

B. V. D. Company v. Canadian Celanese Ltd.

The patent was held invalid because the Canadian claims were drafted in unambiguous broad language that omitted the essential limitation (that the thermoplastic cellulose derivative be present as yarns/filaments/fibres woven into a fabric) found throughout the specification; the court will not read that limitation into the clear claims, and as written the claims were anticipated by prior art (notably Van Heusen) and therefore invalid.

Citation
[1937] SCR 221
Parties
Plaintiff Appellant: B. V. D. Company, Limited; Defendant Respondent: Canadian Celanese Limited
Court
Supreme Court of Canada
Jurisdiction
Canada
Judgment Date
19 March 1937
Procedural Posture
Patent Infringement / Appeal to the Supreme Court of Canada From the Exchequer Court of Canada
Outcome
Appeal allowed; respondent's patent declared invalid
Legal Topics
Validity, Anticipation, Claims Construction, Prior Art, Specification, Infringement
Source Language
English
Intellectual Property Patent Law Validity Anticipation Claims Construction Prior Art Specification Infringement

Case Brief

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Parties

B. V. D. Company, Limited

Plaintiff Appellant

Canadian Celanese Limited

Defendant Respondent

Procedural Posture

Patent Infringement / Appeal to the Supreme Court of Canada From the Exchequer Court of Canada

Legal Issues

  1. 1 Whether the Canadian Dreyfus patent claims are invalid for being over-broad by omitting an essential limitation (thermoplastic cellulose derivative in the form of yarns/filaments/fibres)
  2. 2 Whether prior art (notably Van Heusen and certain British patents) anticipates the claims as written
  3. 3 Whether the courts can narrow claims by importing limitations from the specification

Ratio Decidendi

The patent was held invalid because the Canadian claims were drafted in unambiguous broad language that omitted the essential limitation (that the thermoplastic cellulose derivative be present as yarns/filaments/fibres woven into a fabric) found throughout the specification; the court will not read that limitation into the clear claims, and as written the claims were anticipated by prior art (notably Van Heusen) and therefore invalid.

Court Disposition

Appeal allowed; respondent's patent declared invalid

Orders

  • Judgment of the Exchequer Court of Canada varied
  • Patent no. 265,960 declared invalid