Kimberly-Clark Worldwide, Inc. (“Kimberly-Clark) filed a patent infringement action against First Quality Baby Products, LLC (“First Quality”) over a variety of patents relating to disposable absorbent products, such as diapers and incontinence products, including U.S. Patent No. 5,147,343 (the “Kellenberger Patent”), which relates to an absorbent composite or core for use in disposable absorbent products. As explained by the district court, “[t]he absorbent core consists of a matrix of fibers with superabsorbant polymer (“SAP”) dispersed between the pores of the matrix. An SAP is a chemical compound capable of absorbing ten or more times its own weight in fluid-a useful property for products designed to absorb and retain fluids.”
As one of its defenses, First Quality argued that the Kellenberger Patent was invalid for obviousness. Defendants had previously moved for summary judgment on the of obviousness and had argued in support of that motion that the only feature distinguishing the Kellenberger Patent from the prior art was its use of a new SAP in the absorbent core to replace an older, less effective SAP. “In short, Defendants argued that Plaintiff simply took a new SAP (invented by a third party) and included it in a preexisting diaper design, and that it was obvious to do so. By memorandum issued July 8, 2013, the court denied Defendants’ motion after finding genuine disputes of material fact as to whether it would have been obvious to substitute the new SAP.”
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