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.
Myths About Avoiding Prosecution History Estoppel
In the recent Federal Circuit case <i>Honeywell, Int'l. Inc. v. Hamilton Sundstrand Corp.</i>, 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.
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Robert BuergiThis premium content is locked for LawJournalNewsletters subscribers only
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