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Infosint, S.A. v. Lundbeck

June 26, 2009


The opinion of the court was delivered by: Lewis A. Kaplan, District Judge.


Plaintiff charges defendants with infringing its patent on a process for the synthesis of a chemical compound used in the manufacture of certain pharmaceuticals by selling in the United States the antidepressant drug citalopram, which defendants allegedly made in part by using plaintiff's patented process. The matter is before the Court on defendants' motion for summary judgment dismissing the complaint.


Plaintiff Infosint, S.A. ("Infosint") owns U.S. Patent 6,458,973 (the "'973 patent"), which claims an improved process for making the compound 5-carboxyphthalide, an intermediate product in the synthesis of citalopram. Citalopram is a well-known antidepressant marketed in the United States under the names Celexa and Lexapro.*fn1

Defendants, H. Lundbeck A/S and subsidiary Lundbeck, Inc. (collectively "Lundbeck"), as well as Forest Laboratories, Inc., and Forest Pharmaceuticals, Inc. (collectively "Forest"), manufacture, market, and sell citalopram.*fn2 Lundbeck, a Danish corporation, and its suppliers manufacture the 5-carboxyphthalide used in Lundbeck's production of citalopram at seven facilities located outside of the United States.*fn3

Defendants originally moved for summary judgment dismissing the complaint on the ground that none of the manufacturing processes used at any of the facilities that produce 5-carboxyphthalide for Lundbeck infringes plaintiff's '973 patent. As a result of this Court's claim construction decision,*fn4 however, defendants have narrowed the scope of their motion and now seek in substance partial summary judgment dismissing only the claim of infringement based on the use by defendants of the 5-carboxyphthalide manufactured at the Blue Circle Corporation only.*fn5


A. Legal Standard

Summary judgment is appropriate if there is no genuine issue of material fact and the moving party is entitled to judgment as a matter of law.*fn6 The Court must view the facts in the light most favorable to the nonmoving party*fn7 and the moving party has the burden of demonstrating the absence of a genuine issue of material fact.*fn8 Where the burden of proof at trial would fall on the nonmoving party, however, it ordinarily is sufficient for the movant to point to a lack of evidence on an essential element of the nonmovant's claim.*fn9 In that event, the nonmoving party must come forward with admissible evidence*fn10 sufficient to raise a genuine issue of fact for trial or suffer an adverse judgment.*fn11

B. Analysis

A patentee may demonstrate infringement of its patent claim by either or both of two means. To prevail on a claim of literal infringement, the patentee must prove that the accused process contains each limitation found in the asserted claim.*fn12 If the accused process lacks even a single claim limitation, there is no literal infringement as a matter of law.*fn13 Alternatively, a process that does not literally infringe upon the express terms of a patent claim may nonetheless be found to infringe under the doctrine of equivalents if there is no substantial difference between the limitations of the claim and the accused process.*fn14 The "all limitations" rule applies also under the doctrine of equivalents. Thus, an accused process infringes only "if it contains each limitation of the claim, either literally or by an equivalent."*fn15

Defendants argue that the Blue Circle process does not infringe claim 24*fn16 of the '973 patent because that process is run below 110§ C at all times, whereas the claim is limited to reactions "heating the mixture at 120-145§ C."*fn17 The only evidence they cite for that proposition is a one-page document marked Exhibit LL.*fn18

Exhibit LL purports to be a photocopy of a letter from the Blue Circle Corporation. It is printed on corporate letterhead, dated October 12, 2007, and addressed to "whom it may concern" at H. Lundbeck A/S in Denmark. In place of the author's name and title, the signature block reads only, "Authorised Signatory." The signature itself is illegible.*fn19

The body of the letter reads in its entirety: "This declaration confirms that all batches of 5-Carboxyphthalide shipped to H. Lundbeck A/S or subsidiaries were manufactured by Blue Circle at wholly or partially ...

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