Appeal No. 2005-0841 Application No. 08/230,083 62 S. Ct. 513 ("By the amendment [the patentee] recognized and emphasized the difference between the two phrases and proclaimed his abandonment of all that is embraced in that difference"). There are some cases, however, where the amendment cannot reasonably be viewed as surrendering a particular equivalent. The equivalent may have been unforeseeable at the time of the application; the rationale underlying the amendment may bear no more than a tangential relation to the equivalent in question; or there may be some other reason suggesting that the patentee could not reasonably be expected to have described the insubstantial substitute in question. In those cases the patentee can overcome the presumption that prosecution history estoppel bars a finding of equivalence (emphasis added). *** When the patentee has chosen to narrow a claim, courts may presume the amended text was composed with awareness of this rule and that the territory surrendered is not an equivalent of the territory claimed. In those instances, however, the patentee still might rebut the presumption that estoppel bars a claim of equivalence. The patentee must show that at the time of the amendment one skilled in the art could not reasonably be expected to have drafted a claim that would have literally encompassed the alleged equivalent (emphasis added). The same policy considerations that prevent a patentee from urging equivalents within what the Supreme Court refers to as "surrendered territory" should prima facie prohibit the patentee from being able to claim subject matter within the surrendered territory in reissue. Accordingly, the "surrendered subject matter" that may not be recaptured through reissue should be presumed to include subject matter broader than the patent claims - 27 -27Page: Previous 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 NextLast modified: November 3, 2007