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Myths About Avoiding Prosecution History Estoppel

By Robert Buergi
January 28, 2005

In the recent Federal Circuit case Honeywell, Int'l. Inc. v. Hamilton Sundstrand Corp., 370 F.3d 1131 (Fed. Cir. 2004) (en banc), the court held that a presumption of prosecution history estoppel arises when a patent applicant cancels an independent claim and rewrites its first dependent claim in independent form. Since then, patent attorneys and industry watchdogs have repeatedly misinterpreted the cause of this estoppel. Worse, many have advocated the dangerous strategy of initially writing dependent claims in independent form as a means of avoiding the estoppel. Such a strategy is useless in avoiding estoppel and highly counterproductive. Patent prosecutors should leave dependent claims in dependent form and, instead, avoid estoppel by using the strategies suggested below.

The patentee in Honeywell was asserting infringement under the doctrine of equivalents. Under the doctrine, a device that does not fall within the literal boundaries of a patent's claims may nevertheless infringe if it performs substantially the same function in substantially the same way to obtain substantially the same result as the claimed device. The doctrine is of great value to patentees because it lets them expand the scope of their patent to cover devices that are only insubstantially different from the literal scope of their claims.

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