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Silicon Laboratories Inc. v. Cresta Technology Corporation

United States District Court, N.D. California, San Jose Division

February 25, 2015



PAUL S. GREWAL, Magistrate Judge.

A recurring dispute in patent cases is when exactly a patentee can rely on "representative products" when providing infringement contentions. While the Northern District's Local Patent Rules require that every limitation of every asserted claim be charted against every accused product, this court has not been blind to senselessness of repeating identical multi-page chart after multi-page chart when one or more products represent others. And so when a given product is claimed to represent others, the court has permitted non-duplicative charting. But when exactly does one product "represent" another and what obligation does a patentee have in making such a claim? The case at bar shows why something more than just the patentee's saying it is so is required. As set forth below, the court GRANTS Defendant Cresta Technology Corporation's motion to compel supplemental infringement contentions.


This court's patent rules reflect this court's view that-especially in patent cases-due process requires disclosure. By mandating disclosure in a variety of ways, the rules aim to "make the parties more efficient, to streamline the litigation process, and to articulate with specificity the claims and theory of a plaintiff's infringement claims."[1]

As just one example, Patent L.R. 3-1(c) requires a patentee to serve "[a] chart identifying specifically where each limitation of each asserted claim is found within each Accused Instrumentality."[2] While the rules do not "require the disclosure of specific evidence nor do they require a plaintiff to prove its infringement case, ... a patentee must nevertheless disclose what in each accused instrumentality it contends practices each and every limitation of each asserted claim to the extent appropriate information is reasonably available to it."[3] The purpose is to "provide reasonable notice to the defendant why the plaintiff believes it has a reasonable chance of proving infringement.'"[4] A party can rely on representative products to meet its obligations.[5] But "Rule 3-1... requires Plaintiff to articulate how the accused products share the same, or substantially the same, infringing [qualities] with any other product or with the... representative' product[]."[6]

Crestatech makes and sells silicon tuners for televisions and set-top boxes. Plaintiff Silicon Laboratories Inc. accused Crestatech and its tuners of infringing six United States patents. While this is the first suit between the parties involving all six of these patents, the parties are engaged in various cases involving different patents than those that are at issue here, including: (1) Cresta Technology Corporation v. Silicon Laboratories, Inc. et al., Case No. 14-cv-00078 (D. Del. Jan. 21, 2014); (2) Certain Television Sets, Television Receivers, Television Tuners, and Components Thereof, Inv. No. 337-TA-91 (I.T.C. Jan. 28, 2014); (3) Silicon Laboratories, Inc. v. Cresta Technology Corporation, IPR2014-00728 (P.T.A.B. May 5, 2014); (4) Silicon Laboratories, Inc. v. Cresta Technology Corporation, IPR2014-00809 (P.T.A.B. May 23, 2014); and (5) Silicon Laboratories, Inc. v. Cresta Technology Corporation, IPR2014-00881 (P.T.A.B. June 4, 2014).

Last month, Silicon Labs served Crestatech with its Rule 3-1(c) disclosure of asserted claims and infringement contentions, naming Crestatech's "XC5000 silicon tuner" and the "X7/CTC7xx tuner" as Accused Instrumentalities.[7] The XC5000 is not, however, a distinct product. That term refers instead to two distinct Crestatech products-the XC5000ACQ and the XC5000CCQ tuners.[8] Silicon Labs only charted the XC5000ACQ tuner;[9] it did not provide claim charts for either the XC5000CCQ or any product in the accused X7 line.[10]

According to Silicon Labs, Crestatech "has represented in public documents" that the X7 line of products "is reasonably similar in structure and/or operation to the XC5000[ACQ]."[11] Crestatech disputes this and urges that the tuners in fact employ different wireless communication systems.[12] Crestatech goes further, saying that, if anything, publicly available marketing documents clearly highlight the differences between the X7 line and Crestatech's XC5000 products.[13] Crestatech also points out that, similar to the XC5000ACQ, the XC5000CCQ and the X7 products are publicly available, as is relevant information about the products, such as product briefs that would permit Silicon Labs to do a tear-down of each accused product.[14]

Not satisfied with Silicon Labs' disclosures, Crestatech now moves the court for relief in one of two forms: an order striking the contentions altogether or at least an order compelling Silicon Labs to chart each product.


This court has jurisdiction under 28 U.S.C. §§ 1331 and 1338. The parties further consented to the jurisdiction of the undersigned magistrate judge under 28 U.S.C. § 636(c) and Fed.R.Civ.P. 72(a).


Bender is clear that, in order to rely on a claim that one accused product represents another for purposes of Rule 3-1(c), a patentee must do more than state as much. A patentee must state how. [15] Silicon Labs' contentions fail this basic test.

First, Crestatech has not, as Silicon Labs suggests, made sufficient judicial admissions in the parties' ITC proceedings. Silicon Labs is right that in the ITC case it brought, Crestatech agreed to a consent order in that case that bars Crestatech from importing tuners that infringe the asserted claims. Silicon Labs also is right that before that consent order it charged all SC5000 and X7 products with infringement using just the XC5000 charts as representative of all products accused. But even if the consent order could be read as admitting that all accused products infringe in the same way, that case only involved two of the six patents at issue here. Crestatech said nothing about the other four. ...

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