J. K. Smit & Sons, Inc. v. McClintock

J. K. Smit & Sons, Inc. v. McClintock

The Court held that the essential feature of the respondent's patent was the use of air suction to retain diamonds in their seats during the pouring/forming of the molten metal to prevent 'floating', and that appellant's process does not employ suction at that stage but instead uses temporary adhesive and...

Source-derived case information.

Citation
[1940] SCR 279
Parties
Plaintiff/appellant: J. K. Smit & Sons, Inc.; Defendant/respondent: Richard S. McClintock
Court
Supreme Court of Canada
Jurisdiction
Canada
Judgment Date
22 December 1939
Procedural Posture
Patent Infringement / Declaratory Judgment / Appeal to Supreme Court of Canada From Exchequer Court (final Disposition)
Outcome
Appeal allowed; declaration granted that appellant's machine and its sale or use in Canada does not infringe respondent's patent; costs to appellant throughout.
Legal Topics
Infringement, Claim Construction, Doctrine of Equivalents, Prior Art, Specification Interpretation, Declaratory Relief
Source Language
english
Intellectual Property Patent Law Infringement Claim Construction Doctrine of Equivalents Prior Art Specification Interpretation Declaratory Relief

Source-derived case record

Summary, issues, holding and outcome

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Parties

J. K. Smit & Sons, Inc.

Plaintiff/appellant

Richard S. McClintock

Defendant/respondent

Procedural Posture

Patent Infringement / Declaratory Judgment / Appeal to Supreme Court of Canada From Exchequer Court (final Disposition)

Legal Issues

  1. 1 Whether appellant's centrifugal casting process and pre-anchoring adhesive/suction steps infringe respondent's patent
  2. 2 Proper construction of the respondent's specification and claims (what is essential to the invention)
  3. 3 Whether appellant's steps are equivalents or take the 'pith and marrow' of the patent

Ratio Decidendi

The Court held that the essential feature of the respondent's patent was the use of air suction to retain diamonds in their seats during the pouring/forming of the molten metal to prevent 'floating', and that appellant's process does not employ suction at that stage but instead uses temporary adhesive and centrifugal force; suction during arranging was prior art and not patentable; the claims, properly construed, do not cover appellant's process, so there is no infringement.

Court Disposition

Appeal allowed; declaration granted that appellant's machine and its sale or use in Canada does not infringe respondent's patent; costs to appellant throughout.

Orders

  • Appeal allowed
  • Declaration granted as prayed that appellant's machine and its sale or use in Canada does not constitute infringement of respondent's patent