On this claim construction the jury verdict is not appealed. The judgment entered thereon is affirmed. Procedural Issues Vanguard raises several criticisms of Parker Hannifin's trial procedures. None has been shown to warrant appellate intervention, on the record presented to us. I would reverse.
Zulauf system is at least a two-step manufacturing process . . . .
Vanguard argues that the amendment was not required to secure allowance of the original claims because the notice of allowance did not refer to the supplemental amendment. This is irrelevant because Vanguard chose to amend its claims rather than wait for a response to its request for reconsideration, and the amendment was filed prior to the issuance of the notice of allowance. The arguments distinguishing the amended claims over the prior art are part of the prosecution history that the public has a right to rely on in determining the scope of the claims. Infringement by the doctrine of equivalents should not have been submitted to the jury because prosecution history estoppel bars expanding the claims to include the gaskets with an outer layer formed by dipping as in the CHO-SEAL 3000.