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Be Wary of What You Ask for: The Dangers of Improper Claim Drafting

By Paul A. Ragusa and Lisa Tyner

Some inventions are easily characterized as a pure process, machine, manufacture, or composition of matter and lend themselves to a single independent claim and a simple set of dependent claims. Many inventions, however, involve two or more of the statutory categories of subject matter, and require several independent claims, often creatively drafted, with mapped sets of dependent claims for complete coverage. Can a claim that straddles the line between the statutory categories of subject matter or that does not technically distinguish the invention from other claims be found invalid as an improperly drafted claim?

In a pair of recent decisions, the U.S. Court of Appeals for the Federal Circuit ('Federal Circuit') has emphasized the importance of drafting claims that meet all of the statutory requirements, including the more technical requirements set forth in 35 U.S.C. '112. In IPXL Holdings, LLC v. Amazon.com, Inc., 430 F.3d 1377 (Fed. Cir. 2005), the court held that a claim was indefinite under 35 U.S.C. '112, second paragraph, and therefore invalid, because it attempted to cover both an apparatus and method for using the apparatus. In Pfizer Inc. v. Ranbaxy Laboratories Ltd., 457 F.3d 1284 (Fed. Cir. 2006), the court focused on the requirement of the fourth paragraph of 35 U.S.C. '112, that a claim in dependent form must specify a further limitation of the subject matter claimed, and struck a dependent claim which failed to do so. These two cases are discussed in detail below.

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