G.R. No. 214148 , February 6, 2023
PHILLIPS SEAFOOD PHILIPPINES CORPORATION, PETITIONER, VS. TUNA PROCESSORS, INC., RESPONDENT.

FACTS

Tuna Processors, Inc. (TPI), as successor-in-interest to patentee Kanemitsu Yamaoka, filed an administrative complaint for patent infringement against Phillips Seafood Philippines Corporation (Phillips) before the Intellectual Property Office’s Bureau of Legal Affairs (BLA). TPI alleged that Phillips infringed Philippine Patent No. I-31138, entitled “Method for Curing Fish and Meat by Extra Low Temperature Smoking.” The independent claim of the patent involves a process with four key steps: (1) burning smoking material at 250°C to 400°C; (2) passing smoke through a filter to remove mainly tar; (3) cooling the filtered smoke in a cooling unit to between 0° and 5°C; and (4) smoking the tuna meat by exposure to the smoke cooled to between 0° and 5°C. TPI claimed Phillips used this process after hiring a former employee of TPI’s licensee.
Phillips denied infringement, arguing its process differed materially. Phillips’ process involved: (1) burning sawdust at 250° to 400°C; (2) passing smoke through a series of filters to remove tar, odor, and impurities; (3) storing filtered smoke in a plastic bladder at ambient temperature; (4) injecting the smoke into raw tuna meat; and (5) placing the injected tuna into a refrigeration unit set at -3°C. Phillips emphasized it did not use a cooling unit to cool the smoke to 0°-5°C before injection, and the smoking occurred as the meat was refrigerated after injection.
The BLA initially issued a temporary restraining order and a writ of preliminary injunction against Phillips, based partly on a witness’s testimony about a cooling unit. However, an ocular inspection found no such cooling unit. Ultimately, the BLA dismissed the complaint, finding no literal infringement (as Phillips’ process lacked elements of the patent claims) and no infringement under the doctrine of equivalents, as the processes did not perform substantially the same function in substantially the same way to achieve the same result.
TPI appealed to the Office of the Director General (ODG). The ODG sought a technical expert’s opinion, which found the processes and end products different. The ODG affirmed the BLA’s dismissal. TPI then appealed to the Court of Appeals (CA), which reversed the ODG. The CA applied the doctrine of equivalents, finding that Phillips’ process, by injecting ambient temperature smoke into meat that is then refrigerated to 0°-5°C, performed the same function, used substantially the same means, and achieved the same result as the patented process. Phillips elevated the case to the Supreme Court via a Petition for Review on Certiorari.

ISSUE

Whether the Court of Appeals erred in reversing the Intellectual Property Office’s findings and in holding Phillips liable for patent infringement under the doctrine of equivalents.

RULING

Yes, the Court of Appeals erred. The Supreme Court reversed the CA’s decision and reinstated the dismissal of the patent infringement complaint.
The Supreme Court held that Phillips’ process did not infringe Patent I-31138, either literally or under the doctrine of equivalents. The protection of a patent is limited to the claims contained therein. A side-by-side comparison shows Phillips’ process omits essential elements of the patented claim: it does not cool the filtered smoke in a cooling unit to between 0° and 5°C (Step 3), and it does not smoke the tuna meat by exposure to smoke already cooled to that temperature (Step 4). Instead, Phillips injects ambient temperature smoke and then chills the meat.
For the doctrine of equivalents to apply, the accused process must perform substantially the same function, in substantially the same way, to achieve substantially the same result. The Court found this test was not met. The function (the purpose served) of the patented cooling step is to deliberately condition the smoke itself to a specific low temperature range before contact with the meat. Phillips’ process has no equivalent step; its refrigeration step functions to chill the meat after smoke injection. The means (the method or device used) are substantially different: a cooling unit for smoke versus a refrigeration unit for meat. The result is also different. The patent aims to cure meat by exposure to pre-cooled smoke, which imparts a specific flavor and preservation effect from the conditioned smoke. Phillips’ process results in meat injected with ambient smoke then chilled, a different curing method yielding a different product character. The Court emphasized that the omission of an element of a patent claim precludes a finding of equivalence if that element plays a substantial role in the invention. The cooling of the smoke before smoking was a material part of Yamaoka’s invention. Therefore, Phillips did not infringe the patent.