When the Coca-Cola Company fought — and ultimately won — its battle to register the Contour Bottle as a three-dimensional trademark in Japan, the court and examiners drew on an earlier precedent: the Yakult bottle case.
That small, distinctive plastic container — narrow at the top, rounded at the bottom — is one of the earliest and most significant three-dimensional trademark registrations in Japanese history. Today I’m looking at how it got there, what it means legally, and why it matters for understanding how product shapes can become legally protected assets.
What Is the Yakult Bottle?
Yakult is a probiotic drink developed in 1935 by microbiologist Dr. Minoru Shirota, who spent years cultivating a strain of lactic acid bacteria — now known as Lactobacillus casei Shirota — capable of surviving the journey through the human digestive system. His goal was to improve gut health at a population level.
The current Yakult bottle holds 65ml and has a highly recognizable silhouette: a rounded, bulging lower body tapering into a narrow neck. This shape has remained essentially unchanged since the 1960s. Today, Yakult sells in over 40 countries, with approximately 10 million bottles consumed daily in Japan alone.
📋 Reference: Yakult Honsha: Corporate History
Registering a Shape as a Trademark
Japan introduced its three-dimensional trademark system in 1997 as part of a major revision to the Trademark Act. Yakult Honsha filed for registration shortly after the system launched — a sign of how seriously the company had been thinking about protecting this asset.
The core legal framework is Article 3 of Japan’s Trademark Act, which requires that a mark have “distinctiveness” — the ability to identify the commercial origin of goods in the minds of consumers. Article 3(2) provides a second pathway: even shapes that aren’t inherently distinctive can be registered if they have acquired distinctiveness through extensive use in the market.
Article 4(1)(18) adds an important limitation: shapes that are “indispensable for securing the function” of a product cannot be registered. The Yakult bottle’s shape serves no special functional purpose that a standard bottle couldn’t also serve — its unusual silhouette is a design choice, not a functional requirement. This cleared the first hurdle.
For acquired distinctiveness under Article 3(2), Yakult assembled three categories of evidence:
1. Long-term, consistent use: The same basic shape had been in continuous commercial use for over 30 years by the time of filing. Stability matters — frequent redesigns would undermine the argument that consumers associate the shape with a single source.
2. Consumer recognition data: Survey evidence showing that consumers who saw the bottle shape alone — without any text or logo — identified it as Yakult at high rates.
3. Market exclusivity: No competing products in the probiotic drink category used a substantially similar container shape, reinforcing that the silhouette had become uniquely associated with Yakult.
The Japan Patent Office accepted these arguments, and the bottle was registered as a three-dimensional trademark.
📋 Japan Trademark Registration No.: 4103433 (J-PlatPat)
Why This Case Became a Legal Precedent
The Yakult decision established a template for how acquired distinctiveness arguments should be structured in Japan. When Coca-Cola later sought to register the Contour Bottle, both parties and the court referenced the Yakult framework — the three-part evidence structure of usage history, consumer surveys, and market exclusivity.
This is how IP law often works: individual cases build a body of doctrine that shapes how future disputes are decided. The Yakult case answered the question “what does it take to prove a shape has become a brand?” in concrete, evidentiary terms.
Enforcing the Trademark
Holding a registered three-dimensional trademark gives Yakult the right to challenge competitors who use confusingly similar container shapes for similar products. Reports of cease-and-desist actions against producers of similar-looking containers in various markets have emerged over the years.
The scope of protection is narrow: it applies to this specific shape, for this category of goods, where consumer confusion is plausible. A bottle that vaguely resembles the Yakult silhouette but is used for an unrelated product in a clearly different context would likely fall outside the protected zone.
Comparing Japan’s Small Club of 3D Trademarks
The bar for three-dimensional trademark registration in Japan is genuinely high. Notable registrations include:
Kikkoman tabletop soy sauce dispenser (Reg. No. 4672571): Designed by Kenji Ekuan in 1961, this octagonal bottle is in MoMA’s permanent collection and holds 3D trademark registration in Japan.
Coca-Cola Contour Bottle (Reg. No. 4991338): Registered after the 2008 IP High Court reversal of the JPO’s rejection — a case that explicitly referenced Yakult in its reasoning.
Tricolor ribbon candy: A ribbon-shaped hard candy with a distinctive three-color pattern, registered by its producer as a 3D trademark.
What these examples share is not just distinctive design but proven consumer recognition — built through decades of consistent commercial presence, not just creative ambition.
When a Design Outlives Its Patent — The Long Game of Brand Protection
What I find most instructive about the Yakult case is what it tells us about the relationship between design rights and trademark rights over time.
Design patents (industrial design rights) expire — in Japan, 25 years from filing. Once that clock runs out, the design enters the public domain and competitors can legally copy it. But trademark rights, as long as they are renewed and the mark remains in active commercial use, can theoretically last forever.
Yakult almost certainly held design rights on its bottle shape at some point. Those rights have long since expired. But the three-dimensional trademark — built on 30-plus years of consumer recognition — is still active. The company converted a time-limited protection into a permanent one, through the simple mechanism of consistent use and strategic filing.
Dr. Shirota probably didn’t design that bottle thinking about long-term IP strategy. But the shape stuck, the brand grew, and the law eventually caught up to recognize what consumers had long known: that bottle meant Yakult.
Sources
- J-PlatPat (Japan Patent Information Platform)
- Yakult Honsha: Corporate History
- Japan Patent Office: Overview of the Trademark System
This article is for informational and entertainment purposes only and does not constitute legal advice. For specific IP questions, please consult a qualified patent attorney or trademark attorney.
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