Zoho Corporation v. Sentius International, LLC

Background

Zoho Corporation brought a declaratory judgment action seeking a ruling that it did not infringe Sentius International, LLC’s patents. Sentius counterclaimed against Zoho Corporation and Zoho Corporation Pvt. Ltd. for infringement of U.S. Patent Nos. RE43,633, referred to as the ’633 Patent, and 7,672,985, referred to as the ’985 Patent.

The ’633 Patent concerns linking displayed multimedia or textual material to reference information. Its system divides source material into words or other pieces, records the pieces’ starting and ending positions in a lookup table, links them to external references, and uses a user’s selection to identify and display the corresponding reference material.

Sentius asserted independent claims 17, 18, 62, 101, and 146. Zoho moved for partial summary judgment, arguing that the ’633 Patent was invalid under 35 U.S.C. § 112 for lack of written description. The challenged limitation required determining a beginning-position address of textual source material stored in an electronic database.

Relevant claim construction

The court had construed “beginning position address of [a] textual source material” to mean “the address at which [a] textual source material starts in an electronic database.” The parties had agreed that “database” meant “a data structure for accepting, storing and providing, on demand, data for at least one user.” They also agreed that the method-claim steps had to be performed in the order recited, and the court construed “offset” as “a value from a beginning point.”

The court explained that Sentius had changed the claim language during patent prosecution to emphasize that the address was on an electronic database, rather than merely a relative position within text. The court therefore rejected an interpretation that treated the textual source material and the electronic database as the same thing.

Written-description standard

The written-description requirement asks whether the patent’s specification—the patent’s disclosure—clearly conveys to a person of ordinary skill in the field that the inventor possessed the claimed subject matter as of the filing date. The specification must describe the invention sufficiently; it is not enough that the claimed feature would be obvious, possible, or enabled based on the disclosure.

Written-description analysis is generally a fact question, but summary judgment may be appropriate when the patent specification itself does not disclose the required limitation. Patent invalidity must ordinarily be shown by clear and convincing evidence.

Court’s analysis

The court identified two questions: where the specification described textual source material stored in an electronic database, and where it described determining the address at which that material started in the database.

First, the court examined disclosures concerning a text file, a visual editor, and a “wordified database.” It concluded that the text file was an input used to create the database, not the database itself. The wordified database also could not satisfy the limitation because the agreed claim order required determining the beginning address before cutting the source material into pieces, while the wordified database was created through that cutting process.

The court rejected Sentius’s expert testimony and inventor declaration as insufficient to establish written description. The court noted that the expert described an electronic document becoming a database, while the claims required textual source material stored in an electronic database. The inventor’s declaration likewise referred to an electronic document and did not use or explain the claimed electronic-database limitation. The court found that Zoho’s expert’s opinion that the specification did not show possession of the limitation was unrebutted.

Second, the court considered whether the specification described determining the address where the source material began in the database. Disclosures stating that an index located words or phrases in source material did not identify the beginning address of the source material itself. Nor did descriptions of indexing words by an offset from the beginning of the text disclose an address at which the text began in an electronic database.

The court also rejected Sentius’s argument that the database address was inherently disclosed. Inherent disclosure applies only when a feature is necessarily present, not when it is merely possible or likely. Because the court had construed “offset” broadly as a value from any beginning point, an offset did not necessarily require determining the beginning address in an electronic database.

Disposition

The court held that the ’720 Patent’s original specification, which was substantively identical to the ’633 Patent’s specification for this issue, lacked written description for the limitation involving textual source material stored in an electronic database. It therefore granted Zoho’s motion for summary judgment of invalidity for lack of written description of the asserted claims of the ’633 Patent and terminated Docket Number 81.