Phillips Seafood Philippines Corporation vs. Tuna Processors, Inc.

A process patent is not infringed when the accused process omits a core element specified in the patent claims, and the patentee fails to prove that the accused process performs substantially the same function in substantially the same way to achieve substantially the same result. The Court held that Phillips' process, which did not pre-cool filtered smoke to 0–5°C before tuna exposure, was not equivalent to the patented method, as the timing and temperature of cooling materially affect the chemical curing reaction and final product quality.

Phillips Seafood Philippines Corporation (Phillips) is a domestic corporation processing tuna and seafood. Tuna Processors, Inc. (TPI), a foreign corporation, is the successor-in-interest to Kanemitsu Yamaoka, a co-patentee of Philippine Patent No. I-31138 for a "Method for Curing Fish and Meat by Extra Low Temperature Smoking." The patented process involves burning smoking material, filtering the smoke to remove mainly tar, cooling the filtered smoke in a cooling unit to 0–5°C, and then exposing tuna meat to this cooled smoke. TPI alleged that Phillips, after hiring a former employee of a company using the patented process, constructed smoke machines and used an infringing process to cure tuna.

• Nature: This is an administrative patent infringement case initiated by TPI against Phillips for allegedly using its patented tuna-curing process without authorization.
• Patent I-31138: The patent covers a four-step process: (1) burning smoking material at 250–400°C; (2) filtering the smoke to remove mainly tar; (3) cooling the filtered smoke in a cooling unit to 0–5°C while retaining preservative ingredients; and (4) exposing tuna meat to this cooled smoke.
• Phillips' Alleged Process: Phillips' process involved: (1) burning sawdust at 250–400°C; (2) filtering smoke through a series of filters to remove tar, odor, and impurities; (3) storing filtered smoke at ambient temperature in a plastic bladder; (4) injecting the smoke into frozen tuna meat; and (5) refrigerating the injected tuna at -3°C.
• Ocular Inspection: During a BLA ocular inspection, no cooling unit pre-cooling smoke to 0–5°C was found. The inspection noted that tuna meat after smoke injection was at 5°C and was then refrigerated.
• Expert Opinion: A technical expert, Professor Teresita Acevedo, concluded that the two processes were distinct, resulting in different end products due to differences in filtration, smoke temperature, and application method.

• Claim Construction: Phillips argued that the CA erred in interpreting the phrase "to remove mainly tar therefrom" to mean that other impurities like odor could also be removed, thereby broadening the patent's scope.
• No Literal Infringement: Phillips maintained that its process literally omitted the patent's step of cooling filtered smoke in a cooling unit to 0–5°C before application.
• No Equivalents Infringement: Phillips contended that TPI failed to prove its process was equivalent, as the simultaneous cooling of smoke and tuna in its method differed fundamentally from the patent's pre-cooling step, affecting the chemical reaction and final product.

• Literal Infringement: TPI argued that Phillips' process literally infringed because the cooling of the tuna meat after smoke injection achieved the same temperature range (0–5°C) as the patent's pre-cooling step.
• Doctrine of Equivalents: TPI countered that even if not literally identical, Phillips' process was equivalent because both involved burning, filtering, cooling smoke before curing, and curing tuna with cold filtered smoke, performing substantially the same function to achieve the same result.

• Claim Interpretation: Whether the CA correctly interpreted the patent claim phrase "to remove mainly tar therefrom" to allow for the removal of other impurities.
• Patent Infringement: Whether Phillips' process infringed Patent I-31138, either literally or under the doctrine of equivalents.

• Claim Interpretation: The CA's interpretation was correct. The phrase "to remove mainly tar therefrom" indicates the primary objective of filtration is tar removal, but does not preclude the removal of other impurities. The patent specification itself contemplated the use of various filters that could remove other components.
• Patent Infringement: Phillips' process did not infringe. Literally, Phillips omitted the essential step of pre-cooling filtered smoke to 0–5°C before tuna exposure. Under the doctrine of equivalents, TPI failed to prove that Phillips' process—cooling smoke to ambient temperature before injection and then refrigerating the tuna—performed substantially the same function in substantially the same way as the patented pre-cooling step. The timing and temperature of cooling materially affect the rate and nature of the chemical curing reaction, and no evidence showed that Phillips' method retained the same highly preservative and sterilizing effects.

• Claim Construction in Patent Law — The extent of patent protection is determined by the claims, interpreted in light of the description and drawings. Clear claim language binds the patentee and the courts.
• Literal Infringement — Occurs when every element of a patent claim is found in the accused product or process. If any element is missing, there is no literal infringement.
• Doctrine of Equivalents — Infringement may also occur if the accused process, while not literally identical, performs substantially the same function in substantially the same way to achieve substantially the same result as the patented invention. The test is applied element-by-element, not to the invention as a whole.
• Burden of Proof in Process Patent Infringement — The patentee bears the burden of proving infringement. For process patents, a presumption of infringement arises only if the product is new or if the patentee cannot determine the actual process used despite reasonable efforts; otherwise, the burden remains with the patentee.

• "The inventive step of Patent I-31138 is smoking tuna meat at extra low temperatures between 0° and 5°C... The reason for bringing down the temperature further to between 0° and 5°C is... maximum sterilizing and decomposition and discoloration preventing effects are obtainable."
• "Phillips' process does not fall within the scope of Patent I-31138... The elements of cooling the filtered smoke to 0° and 5°C in a cooling unit before applying it to the tuna meat are absent."
• "The doctrine of equivalents must be applied to the individual elements—not to the invention as a whole. This is to avert the possibility of expanding the patent scope beyond the elements of its claim(s)."
• "Absent any evidence that the ambient temperature filtered smoke cools down to between 0° and 5°C before the chemical reaction takes place, and it retains the ingredients which exert the same highly preservative and sterilizing effects, the Court is constrained to rule that the simultaneous cooling of the smoke and the meat is not equivalent to Patent I-31138's pre-cooling of the filtered smoke."

• Godines v. Court of Appeals, 297 Phil. 375 (1993) — Applied the literal infringement test and the doctrine of equivalents (function-means-result test) in a patent case involving agricultural machinery.
• Smith Kline v. Court of Appeals, 456 Phil. 213 (2003) — Emphasized that claims define the scope of protection and applied the doctrine of equivalents, holding that identity of result alone does not constitute infringement unless the means are also substantially the same.
• Gsell v. Yap-Jue, 12 Phil. 519 (1909) — Early application of the doctrine of equivalents (then called mechanical equivalents) in a process patent case.
• Del Rosario v. Court of Appeals, 325 Phil. 424 (1996) — Applied the triple identity test (function, means, result) under the doctrine of equivalents to audio equipment patents.

• Section 76.1, Intellectual Property Code — Defines patent infringement as the making, using, offering for sale, selling, or importing a patented product or process without the patentee's authorization.
• Section 75, Intellectual Property Code — States that the extent of patent protection is determined by the claims, interpreted in light of the description and drawings, and that equivalents of claim elements are to be considered.
• Section 78, Intellectual Property Code — Provides that for process patents, the burden of proving that an identical product was obtained by a different process shifts to the defendant under certain conditions (not applicable here as the product was not new).

• Justice Alfredo Benjamin S. Caguioa (Ponente)
• Justice Ramon Paul L. Hernando
• Justice Henri Jean Paul B. Inting
• Justice Rodil V. Zalameda

N/A — The decision was unanimous.