Delhi High Court

Dishonest adoption of phonetically similar pharmaceutical marks precludes prior user defense and warrants permanent injunction

Sanofi Aventis vs Intas Pharmaceuticals Ltd. & Anr

Delhi High CourtJUDGMENT: April 28, 20262 MIN READSOURCE JUDGMENT
THE ORIGINAL LAWLENS SUMMARY
01

Facts

The Plaintiff, a French pharmaceutical company, is the registered proprietor of the trademark PLAVIX (word mark and device) used for an anti-thrombosis drug containing 'Clopidogrel'

Source reference: p.2-3

The marks were registered with effect from 1995 and 1998, with a global launch in 1998 and an Indian launch in 2003

Source reference: p.2

In 2008, the Plaintiff discovered the Defendants were using the mark CLAVIX for an identical preparation and filed a suit for infringement and passing off

Source reference: p.4

The Defendants claimed they bona fidely adopted the mark in 2001, deriving 'CL' from the salt name and 'AVIX' from the therapeutic indication "Atherosclerotic Vascular Incidences"

Source reference: p.5
02

Issues

1. Whether the Plaintiff is the registered proprietor of the mark PLAVIX?

Source reference: p.10 / para. 22

2. Whether the Defendants' use of the mark CLAVIX constitutes infringement and/or passing off?

Source reference: p.11 / para. 28

3. Whether the Defendants are entitled to the defense of prior user under Section 34 of the Trade Marks Act?

Source reference: p.12 / para. 28

4. Whether the suit is barred by delay or laches?

Source reference: p.52 / para. 117
03

Law Applied

Section 29 of the Trade Marks Act, 1999 regarding infringement, where deceptive similarity between marks for identical goods triggers statutory relief

Source reference: p.16

Kaviraj Pandit Durga Dutt Sharma v. Navaratna Pharmaceutical Laboratories, distinguishing that in infringement, added features like packaging differences are immaterial if the essential features are adopted

Source reference: p.17-18

Stricter approach for medicinal products was derived from Cadila Health Care v. Cadila Pharmaceuticals, emphasizing that similarity in medicines can be life-threatening

Source reference: p.21-22

Section 34 of the Act was interpreted via Bodhisattva Charitable Trust v. Mayo Foundation, requiring the defendant's use to pre-date both the plaintiff's registration and user

Source reference: p.38
04

Reasoning

The Court found the marks PLAVIX and CLAVIX to be structurally and phonetically similar, differing by only a single letter

Source reference: p.20

Regarding infringement, the Court noted that since the Plaintiff's registrations dated back to 1995 and 1998, the Defendants' 2001 use did not meet the "prior to registration" requirement of Section 34

Source reference: p.39

The Court deemed the Defendants' adoption dishonest; the explanation for coining the mark was "far-fetched" as the term "Atherosclerotic Vascular Incidences" does not exist in standard medical literature

Source reference: p.30

The Court also highlighted the Defendants’ failure to conduct a trademark search before launching

Source reference: p.34

The claim for passing off failed because the Plaintiff could not prove sufficient "spillover reputation" in India specifically in 2001 (the time of Defendants' launch), applying the territoriality principle from Toyota v. Prius

Source reference: p.44, 51

Delay was excused as the Plaintiff was entitled to wait until the infringement posed a significant commercial threat, and equity does not assist a dishonest adopter

Source reference: p.53-54
05

Holding

The Court held that the Defendants had infringed the Plaintiff’s registered trademark but failed to prove passing off due to lack of established goodwill in 2001

The Court granted a permanent injunction restraining the Defendants from using CLAVIX or any deceptively similar mark

Source reference: p.63

The Court awarded nominal damages of Rs. 20,00,000/- for the injury caused by infringement and the continuous use of the mark during the litigation

Source reference: p.59-60

The Plaintiff was also awarded actual costs of the suit, to be determined by the Taxation Officer

Source reference: p.63-64
Delhi High Court

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Sanofi AventisvsIntas Pharmaceuticals Ltd. & Anr

Delhi High Court · April 28, 2026

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