Omega ./. Tudor et al.: The aftermath of Baselworld 2015

Case No. O2015_008 ¦ Main hearing of 30 January 2018

Omega logo

The main hearing in this matter took place earlier today.

See this Blog here for a brief review of the subject-matter at stake, based on the court’s detailed announcement of the hearing.

  1. Background of the case

Infringement of Omega‘s  EP 1 837 719 B1 is at stake; see EPO Register and Swissreg for further bibliographic details.

The single independent claim 1 reads as follows:

Balance for a timepiece movement including a felloe (3), arms (4) connecting the felloe (3) to the balance staff and inertia blocks (11) for adjusting the unbalance and regulating the moment of inertia, characterized in that the felloe (3) includes studs (7) directed inwards, a threaded hole (9) into which said inertia blocks (11) are screwed from the inside, passing through said felloe (3) and said studs (7).

This is best understood with Fig. 1 of the patent at hand:

Fig. 1 of the patent in suit

The attacked embodiments are Tudor‘s calibres MT5621 and MT5612; infringement under the Doctrine of Equivalents is alleged. The current versions of the calibres are shown below:

Interestingly, the balance wheels looked a little different when the calibre had been introduced back in 2015 at Baselworld; see here. Do you notice the different balance wheel in the top right of the calibre?

Former promotional material re Tudor’s calibre MT5621

We have found a perspective picture of the old MT5612 balance wheel on the internet here; a similar picture had been shown in the hearing.

When digging a bit deeper, we came across a report in a watch Blog suggesting that the change of the balance wheel had apparently been implemented in view of Omega’s intervention at Baselworld 2015. Indeed, that would be a perfect fit with the case number of the present matter referring back to 2015.

Tudor logo

Now, about three years later, the case surfaces again. Defendants Tudor and Detech deny infringement under the DoE and countersued for invalidity in view of DE 864 827US 759,914US 2,958,997, ROLEX calibres and the common general knowledge of the skilled person.

  1. Learnings from the hearing

Based on what  can be concluded from the pleadings, plaintiff is on the defensive. The expert opinion of the judge-rapporteur had apparently held that the claimed subject-matter (to the extent invoked) was novel, but not inventive. However, the judge-rapporteur had not yet assessed infringement in his expert opinion.

UPDATE Feb 1, 2018:

The first version of this post indicated that the expert opinion of the judge-rapporteur had already addressed infringement. I have been informed by plaintiff’s counsel that this is not the case. Accordingly, this has been corrected in the above. /MW

Most of the discussion was about fulfilment the feature

[…] inertia blocks (11) are screwed into a threaded hole (9) from the inside […].

Evidently, the parties disagree on whether or not this feature is fulfilled in the attacked embodiment(s). Is it sufficient for infringement to be ruled out if the inertia blocks are screwed into the threaded hole from the outside? It remains to bee seen whether fixation from the outside might constitute infringement under the DoE. In particular, plaintiff argued that there was no indication whatsoever in the patent in suit that the direction of fixation was of any relevance. Guess which way the wind is blowing: Pemetrexed.

The final judgment needs to be awaited, to fully understand how the inertia blocks in the attacked embodiments are actually fixed.

The value in dispute is CHF 1M. The parties did not enter into settlement discussions today.

Reported by Jolanda MINDER and Martin WILMING


Case No. O2015_008 ¦ Main hearing of 30 January 2018

Omega S.A.


  1. Montres Tudor S.A.
  2. Detech S.A.


  • Dr. Mark SCHWEIZER
  • Dr. Tobias BREMI
  • Frank SCHNYDER
  • Dr. Philippe DUCOR
  • Christoph MÜLLER

Court Clerk:


Representative(s) of Plaintiff:

Representative(s) of Defendants:


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