Patent anticipation, obviousness, and mechanical equivalents: prior art failed, the prior-use defence failed, and infringement was found.

A prior publication anticipates a patent only if it discloses the whole invention with clear and unmistakable directions enabling the skilled person to practise it; unrelated materials or a mosaic of separate documents are insufficient, so the patent was not anticipated. The invention was not obvious because the decisive inventive feature was the specific arrangement that automatically threaded the calendar rolls, and long-standing failure by others to solve the practical problem supported patentable subject matter. The Canadian prior-use defence failed because the statutory language covered public use anywhere before filing, but the only proved use was by the inventor himself. The respondents' apparatus infringed because redirecting the air jet was only an immaterial mechanical equivalent.

---

---

Issues: (i) Whether the patented device lacked novelty or was anticipated by prior publications and prior patents; (ii) whether the invention was obvious and involved no patentable subject matter; (iii) whether the Canadian statutory defence based on prior public use barred the patent; and (iv) whether the respondents' apparatus infringed the patent.

Issue (i): Whether the patented device lacked novelty or was anticipated by prior publications and prior patents.

Analysis: Anticipation required the earlier specification or publication to disclose the whole invention with clear and unmistakable directions, so that a person faced with the problem would find the claimed solution in it. The alleged anticipations did not do so. They were either unrelated, materially different, or could only be assembled by an impermissible mosaic of separate documents and later knowledge of the patent in suit.

Conclusion: The patent was not anticipated.

Issue (ii): Whether the invention was obvious and involved no patentable subject matter.

Analysis: The decisive feature was not the mere presence of a doctor and an air blast, both of which were old, but the particular arrangement by which the paper was detached from the upper roll and caused to cling to the lower roll so as to thread the calendar rolls automatically. The fact that others had not solved the practical problem for many years supported the presence of invention, and the final adjustment that made the process work was treated as the real inventive step.

Conclusion: The patent involved patentable invention and was not invalid for obviousness or want of subject matter.

Issue (iii): Whether the Canadian statutory defence based on prior public use barred the patent.

Analysis: The relevant statutory language was construed as referring to public use anywhere before the Canadian patent application, not merely public use in Canada. On the facts, the only proved use was by the inventor himself in Maine before filing, which did not defeat the patent. The statutory defence therefore failed.

Conclusion: The statutory defence was not made out.

Issue (iv): Whether the respondents' apparatus infringed the patent.

Analysis: Although the respondents redirected the air jet against the doctor blade rather than directly against the upper roll, the jet ultimately reached the same operative point and achieved the same function in substantially the same way. The variation was only an obvious mechanical equivalent and did not avoid infringement.

Conclusion: The patent was infringed.

Final Conclusion: The patent was upheld as valid and infringed, and the appeal succeeded with appropriate consequential relief to follow in the Canadian court.

Ratio Decidendi: A prior publication anticipates only if it discloses the whole invention with clear directions enabling the skilled person to practice it, and an immaterial mechanical variation that performs the same function in substantially the same way will not avoid infringement.

---