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function,way,result之外的均等論...known interchangeability

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RING & PINION SERVICE INC., Plaintiff-Appellee, 

v. 
ARB CORPORATION LTD., Defendant-Appellant.

Decided: February 19, 2014 

There is not, nor has there ever been, a foreseeability limitation on the application of the doctrine of equivalents. It has long been clear that known interchangeability weighs in favor of finding infringement under the doctrine of equivalents. 

Sage Products held that claim vitiation, not foreseeability, prevented the application of the doctrine of equivalents in that case because its application “would have utterly written” express limitations “out of the claim.” Overhead Door Corp. v. Chamberlain Grp., Inc., 194 F.3d 1261, 1271 (Fed. Cir. 1999) (citing 126 F.3d at 1423–25). “[B]ecause the scope of the claim” in Sage Products “was limited in a way that plainly and necessarily excluded a structural feature that was the opposite of the one recited in the claim, that different structure could not be brought within the scope of patent protection through the doctrine of equivalents.”

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