Del Rosario vs. Court of Appeals

A patentee who presents a patent in due form is entitled to a prima facie presumption of its correctness and validity, and a preliminary injunction may issue to restrain alleged infringement if the patentee demonstrates a clear legal right and acts violative thereof, unless the respondent overcomes the presumption with competent evidence.

Roberto L. del Rosario was the holder of two utility model patents (Letters Patent No. UM-5269 and UM-6237) for a sing-along system or karaoke audio equipment. In early 1990, he discovered that Janito Corporation was manufacturing and selling a similar sing-along system under the brand "miyata" or "miyata karaoke." Believing this constituted infringement, del Rosario filed a complaint for patent infringement and sought a writ of preliminary injunction to stop Janito Corporation's activities.

• Nature of the Action: Petitioner Roberto L. del Rosario filed a complaint for patent infringement against private respondent Janito Corporation, alleging that the latter's "miyata" karaoke system infringed his two utility model patents.
• The Patents: Petitioner held Letters Patent No. UM-5269 (issued 2 June 1983) and No. UM-6237 (issued 14 November 1986) for utility models describing a sing-along system or karaoke audio equipment. The terms were extended for five years each.
• Alleged Infringement: Petitioner claimed that private respondent's "miyata" system was substantially similar, if not identical, to his patented models in construction, function, and operation.
• Private Respondent's Defense: Janito Corporation denied infringement and cited several physical and technical differences between its "miyata" equipment and petitioner's first utility model (UM-5269). It also argued that the karaoke system was a universal product known and manufactured long before petitioner's patents.
• Lower Court Proceedings: The RTC granted a temporary restraining order and subsequently a writ of preliminary injunction, finding that petitioner was a patent holder and that private respondent was manufacturing a substantially similar product without authorization.
• Appellate Court Reversal: The Court of Appeals, in a certiorari proceeding, set aside the injunction. It held that the mere manufacture of a karaoke system did not constitute infringement, as the karaoke was a universal product existing before petitioner's patents.

• Scope of Certiorari: Petitioner argued that the Court of Appeals improperly considered questions of fact in a certiorari proceeding, which is limited to issues of jurisdiction or grave abuse of discretion.
• Deference to Trial Court Findings: Petitioner maintained that the appellate court erred in disregarding the factual findings of the trial court, which were based on evidence presented during the injunction hearing.
• Right to Injunctive Relief: Petitioner contended that he had established a clear legal right (his patents) and that private respondent's acts were violative of that right, satisfying the requisites for a preliminary injunction.
• Private Respondent's Lack of Right: Petitioner argued that in the absence of its own patent, private respondent was not entitled to the injunctive relief granted by the Court of Appeals.

• No Infringement: Respondent countered that its "miyata" karaoke system was not substantially identical to petitioner's patented models, citing specific differences in design, components, and circuitry.
• Prior Art and Lack of Novelty: Respondent argued that the karaoke system was a universal product manufactured and marketed worldwide long before petitioner obtained his patents, implying the patents were invalid for lack of novelty.
• Abuse of Discretion: Respondent maintained that the trial court committed grave abuse of discretion in issuing the injunction because petitioner failed to establish a clear and unmistakable right that was being violated.

• Propriety of Certiorari: Whether the Court of Appeals erred in entertaining factual questions in a certiorari proceeding and in overturning the trial court's factual findings.
• Validity of the Preliminary Injunction: Whether the trial court correctly issued the writ of preliminary injunction based on the evidence presented.

• Propriety of Certiorari: The Court of Appeals did not err in reviewing the evidence because the core issue was whether the trial court committed grave abuse of discretion, which necessitated an examination of the factual basis for the injunction. However, the appellate court's conclusion that no prima facie infringement was shown was incorrect.
• Validity of the Preliminary Injunction: The trial court did not commit grave abuse of discretion. The petitioner presented his patents in due form, which created a prima facie presumption of their validity. Private respondent failed to overcome this presumption with competent evidence, as its witness's testimony regarding prior art was uncertain and unsupported. Furthermore, a comparison of the functions and modes of operation showed substantial similarity, establishing a prima facie case of infringement sufficient for the provisional remedy of injunction.

• Prima Facie Validity of a Patent — A patent, when presented in evidence in due form, affords a prima facie presumption of its correctness and validity. The burden of proof shifts to the party challenging the patent to overcome this presumption with competent evidence.
• Requisites for Preliminary Injunction — For a preliminary injunction to issue, two requisites must be satisfied: (1) the existence of the right to be protected, and (2) the acts against which the injunction is directed are violative of that right. The right must be present, clear, and positive.
• Test for Patent Infringement — A patent may be infringed if the essential or substantial features of the patented invention are taken. The alleged infringing device must perform the same function or accomplish the same result by identical or substantially identical means, and the principle or mode of operation must be substantially the same.

• "Where petitioner introduces the patent in evidence, if it is in due form, it affords a prima facie presumption of its correctness and validity. The decision of the Director of Patents in granting the patent is always presumed to be correct, and the burden then shifts to respondent to overcome this presumption by competent evidence." — This passage underscores the evidentiary weight of a patent and the allocation of the burden of proof in infringement cases.
• "It is elementary that a patent may be infringed where the essential or substantial features of the patented invention are taken or appropriated, or the device, machine or other subject matter alleged to infringe is substantially identical with the patented invention." — This articulates the substantive test for determining infringement.

• Araneta v. Gatmaitan, 101 Phil. 328 (1957) — Cited for the general principles governing the issuance of preliminary injunctions.
• Samson v. Tarroza, No. L-20354, 28 July 1969, 28 SCRA 792 — Cited for the principle that a new model of an industrial product, even without the quality of invention but of practical utility, is entitled to a patent for a utility model.
• Philippine Lawyers' Association v. Agrava, 105 Phil. 173 — Cited for the authority of the Director of Patents to decide questions of fact in patent applications.
• Vargas v. F.M. Yaptico and Co., Ltd., 40 Phil. (1919) — Cited for the presumption of correctness attaching to the Director of Patents' decision to grant a patent.

• Section 55, Republic Act No. 165 (The Patent Law) — Provides for the protection of new, original designs and new models of implements or industrial products (utility models) by patents, subject to the same provisions as patents for inventions. The Court applied this to affirm petitioner's entitlement to utility model patents.
• Section 37, Republic Act No. 165 (The Patent Law) — Grants the patentee the exclusive right to make, use, and sell the patented product. The Court relied on this to define the scope of petitioner's exclusive rights and the basis for alleging infringement.

• Justice Teodoro R. Padilla
• Justice Vitug
• Justice Kapunan
• Justice Hermosisima, Jr.