Ring & Pinion Serv., Inc. v. ARB Corp.
Foreseeability of asserted equivalence at the time of patenting is not a bar to the doctrine of equivalents.
Results for foreseeability
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Honeywell Int’l Inc. v. Hamilton Sundstrand Corp.
A presumption of prosecution history estoppel may be rebutted by a showing of unforeseeability of the alleged equivalent at the time of the narrowing amendment or by a showing of tangentiality of the alleged equivalent with respect to the rationale for the narrowing amendment.
Talbert Fuel Systems Patents Co. v. Unocal Corp.
The doctrine of equivalents cannot operate to extend claim scope to an extension of a range relinquished during prosecution where the relinquished portion of the range was foreseeable to the patentee.