You are using an outdated browser and your browsing experience will not be optimal. Please update to the latest version of Microsoft Edge, Google Chrome or Mozilla Firefox. Install Microsoft Edge

August 27, 2014

Registering Common Characters as Trademarks

Informed Counsel

In Thailand, the requirements for trademark registration are specified in Section 7 of the Trademark Act. One requirement, subject to certain exceptions, stipulates that marks must possess the element of “distinctiveness,” in that they must be distinguishable from the marks of other parties in the eyes of the general public (this quality is also referred to as “inherent distinctiveness”). The second paragraph of this provision states the essential elements that constitute such distinctiveness.

The second paragraph of Section 7 does not, however, explicitly provide for any restrictions on the registration of marks that consist of individual Roman letters, Arabic numerals, mathematical symbols, scientific symbols, or abbreviations. This has led to uncertainty as to whether or not those elements are deemed distinctive.

In practice, the Department of Intellectual Property (DIP) either: (i) orders such elements in marks to be disclaimed; or (ii) rejects an application for a mark consisting of such elements entirely. This approach is justified on the basis that the elements are common terms, generic, or words having general meaning.

In view of this, many applicants will disclaim such elements in their marks ahead of time to allow for the registration process to continue unhindered. An applicant whose whole mark contains such generic content runs the risk of its mark being considered unregistrable by the DIP.

In such cases, some trademark owners have challenged the decision of the DIP by initiating legal proceedings with the Central Intellectual Property and International Trade Court (IP&IT Court). The following case studies provide insight into how the Thai courts assess trademark distinctiveness in such cases.

~H2O+

In 2001, H2O Plus L.P., a well-known U.S. manufacturer of cosmetics and other body-care products, filed applications for its house brand ~H2O+, among other things, for services in Class 35 that cover business management for retail stores.

The Registrar and the Board of Trademarks, under the authority of the DIP, considered the mark ~H2O+ to be nondistinctive based on the use and inclusion of common Roman letters, Arabic numerals, and mathematical symbols in the mark. The DIP deemed the mark to be unregistrable and ordered its rejection.

H2O Plus appealed the decisions reached by the Registrar and the Board of Trademarks to the IP&IT Court, contending that the mark was neither descriptive of the services (another requirement for word marks being that they must not directly refer to the character or quality of the goods or services) nor nondistinctive, as had been claimed by the DIP.

Upon consideration, the IP&IT Court found that the mark ~H2O+ referred to the chemical formula for water and did not make a direct reference to the character or quality of the retail services in Class 35. The Court, therefore, considered the DIP’s order to be unlawful and allowed the mark ~H2O+ to be registered for the services in Class 35. The Court’s judgment was affirmed by the Supreme Court in 2007, which provided that, given the services covered by the mark, ~H2O+ was an inherently distinctive mark, because the mark made no direct reference to the character or quality of the services.

4°C

A recent Supreme Court judgment, issued in 2014, mirrors the same principle followed by the IP&IT Court and Supreme Court in the H2O Plus case.

In 2005, ASTY Inc., a Japanese company, filed applications to register the mark 4°C for products in Classes 14, 18, and 25 in Thailand. The Registrar and the Board of Trademarks rejected the applications, considering the mark 4°C to be nondistinctive due to the use and inclusion of common mathematical symbols and the common abbreviations for degrees Celsius. ASTY Inc. appealed the decision to the IP&IT Court.

The IP&IT Court declared that fanciful marks, arbitrary marks, or suggestive marks are considered to possess the element of distinctiveness. The provisions of the Trademark Act do not stipulate that a generic word or a word having general meaning cannot be distinctive. The IP&IT Court therefore accepted the registration of the mark 4°C.

The DIP, as the defendant, appealed the IP&IT Court’s judgment to the Supreme Court. In 2014, the Supreme Court ruled that the plaintiff’s trademark 4°C was distinctive under Section 7 of the Trademark Act. The Supreme Court further elaborated that “a distinctive trademark” is one which enables the public or users to distinguish the goods with which the trademark is used from other goods.

The Supreme Court also held that the provisions of the Trademark Act do not stipulate that a generic word or a word having general meaning cannot be distinctive. Although the plaintiff’s trademark 4°C was composed of the number “4,” the symbol “°,” and the letter “C” as an abbreviation of degrees Celsius, the combination of which refer to the general meaning of “4 degrees Celsius,” the trademark had no direct reference to the character or quality of goods specified under the applications; for instance, metalware used on a dining table (International Class 14), briefcases (International Class 18), and bathing suits (International Class 25). Hence, the plaintiff’s trademark 4°C was inherently distinctive, and thus registrable.

Flexible View by the Courts

These two judgments evidence the fact that the courts have a broader, more flexible view in considering the distinctiveness of trademarks. Individual Roman letters, Arabic numerals, mathematical symbols, scientific symbols, abbreviations, or any combination of these elements may be accepted for registration and considered distinctive, as long as they do not directly reference the character or quality of the goods or services specified in the applications.

RELATED INSIGHTS​ 

June 10, 2026
In March 2026, the Intellectual Property Office of Vietnam (IP Office) issued a decision refusing a trademark application after considering an opposition based primarily on copyright grounds. The outcome is noteworthy because the foreign brand owner had neither trademark registrations nor applications in Vietnam at the time the opposition was filed, and the IP Office has historically applied a stringent approach to oppositions relying on copyright. The Opposition Maurten is a well-known Swedish sports nutrition brand recognized globally for its innovative hydrogel technology, which is designed to help endurance athletes fuel more effectively without gastrointestinal discomfort. The brand’s distinctive logo is characterized by clean lines and a bold black-and-white color scheme, and has long been associated with the company’s performance products. The brand’s logo is displayed above. An identical mark was filed for registration by a Vietnamese trademark squatter. In 2023, a Vietnamese individual filed an application for registration of an identical mark (Application No. 4-2023-38668), a practice commonly observed in Vietnam as trademark squatting. The brand owner engaged Tilleke & Gibbins to assist with strategy and filing an opposition to the mark. At the time, Maurten had no trademark rights or meaningful use in Vietnam, and global marketing data showed only modest figures without any local presence. Thus, to convince the IP Office to refuse the squatter’s application, instead of relying on trademark rights or use evidence, the opposition strategy centered on the copyright protection of the logo itself, as copyright arises automatically in Vietnam upon creation of the work and does not require registration. (It is worth noting, however, that the IP Office has traditionally been cautious in accepting copyright as a basis for refusing trademark applications.) On September 24, 2024, an opposition was filed on three main grounds: confusing similarity, copyright infringement of the artistic work,
June 10, 2026
For multinational franchisors operating in Thailand, a key risk after franchise termination is that former outlets may continue operating in ways that could easily mislead consumers into believing they remain within the authorized network. To justify such operations, former franchisees often argue that the termination was invalid or ineffective. As a result, these cases are often treated as contractual disputes, making it difficult for franchisors to obtain injunctive relief before a final judgment confirms that the termination was lawful. Franchisors face significant commercial and reputational harm during lengthy proceedings, including consumer confusion, disruption to franchise restructuring, and damage to brand reputation and customer trust. In an encouraging development, the Thai court in a 2025 case responded to the problem of unauthorized post-termination franchise operations by granting interim relief, recognizing broader brand and consumer harm, and awarding substantial damages, highlighting a successful litigation strategy of framing the dispute not merely as a contractual termination issue but as trademark infringement causing ongoing commercial injury. The Subway Case From December 2024 to mid-2025, an unauthorized “Subway®” franchise operation in Thailand attracted substantial public and media attention. Reports and online discussions about unauthorized Subway® stores circulated widely after complaints arose about food quality and customer experience at certain outlets that were allegedly operating after their franchise rights had expired. Because these stores continued to use Subway® trademarks, trade dress, and overall commercial appearance, many consumers were unable to distinguish them from authorized operations, resulting in reputational risks and customer confusion that affected the franchisor’s brand and franchise system in Thailand. Subway treated this matter with the utmost seriousness and moved promptly to protect its brand, franchise system, and customers. It filed a civil action with the IP&IT Court seeking a permanent injunction and damages. During the proceedings, the court granted a preliminary injunction
May 25, 2026
Thailand published new rules on May 1, 2026, establishing clear procedures for how the Anti-Money Laundering Office (AMLO) handles digital assets seized during criminal and money laundering investigations. Taking effect the following day, the Regulation of the Anti-Money Laundering Board on the Custody and Management of Seized or Frozen Assets (No. 3) B.E. 2569 applies to digital asset businesses, cryptocurrency holders, and anyone subject to asset seizure under Thailand’s anti-money laundering laws. For the first time, authorities now have a detailed roadmap for transferring seized digital property from private or foreign control into secure state custody. Digital asset businesses holding customer assets under investigation must be prepared to comply with these rules compelling repatriation of such assets in enforcement actions. Expanded Definition of Digital Assets The regulation defines digital assets to include not only those covered by Thailand’s existing digital asset business law but also any other property that can be stored using the same methods as digital assets. This broad formulation means the custody rules will apply to emerging blockchain-based assets and tokenized property that may not yet fall within the statutory definition of a digital asset business, giving authorities flexibility as the technology evolves. Mandatory Transfer to Domestic Custody When digital assets are held with service providers outside Thailand, AMLO will first attempt to transfer them to an account the office maintains with a licensed domestic digital asset business operator. If the domestic operator does not support that particular asset, the office will instead move the assets to its own cold wallet (offline, internet-isolated storage system). If neither option is feasible, the seizing official will report the situation to the Anti-Money Laundering Committee for alternative instructions. A similar hierarchy governs assets held in an accused party’s private wallet or by any third party that is not a
May 22, 2026
Intellectual property specialists from Tilleke & Gibbins in Vietnam have contributed an updated Intellectual Property Transactions in Vietnam overview for Thomson Reuters Practical Law, an online publication that provides comprehensive legal guides for jurisdictions worldwide. The Vietnam overview was authored by Linh Thi Mai Nguyen, Thanh Phuong Vu, Chi Lan Dang, Son Thai Hoang, and Duc Anh Tran. The chapter provides a high-level examination of key aspects of IP transactions law in Vietnam, including IP assignment and licensing, research and development collaborations, IP in mergers and acquisitions (M&A), lending and taking security over intellectual property rights, settlement agreements, employee- and consultant-created IP, competition law, taxation, and non-tariff trade barriers. Key topics covered in the chapter include: IP assignment: Basis and formalities for assignments of patents, utility models, trade marks, copyright, design rights, trade secrets, confidential information, and domain names in Vietnam. IP licensing: Scope, formalities, and recordal requirements for licensing patents, trade marks, copyright, design rights, and trade secrets. Research and development collaborations: Treatment of improvements, derivatives, and joint ownership of IP, including exploitation and enforcement issues. IP aspects of M&A and security: Due diligence, warranties, transfer formalities, and taking security over intellectual property rights. Practical Law, a legal reference resource from Thomson Reuters, publishes a range of guides for hundreds of jurisdictions and practice areas. The Intellectual Property Transactions Global Guide is a valuable resource for legal practitioners seeking comparative insight into transactional IP issues across multiple jurisdictions. To view the latest version of the Intellectual Property Transactions in Vietnam overview, please visit the Practical Law website and enroll in the free Practical Law trial to gain full access.