815 F.3d 1302
Fed. Cir.2016Background
- Zoltek sued the United States in the Court of Federal Claims claiming the government (via Air Force and Navy contractors) used its reissued U.S. Patent No. Re. 34,162 covering a method to make carbon-fiber sheet products with preselected surface electrical resistivity. Zoltek had acquired the patent from Stackpole Fibers.
- This appeal follows extensive procedural history including earlier Federal Circuit decisions: Zoltek I (holding no claim where steps occur abroad) and Zoltek II (en banc reversing and holding the U.S. liable for contractor use under 28 U.S.C. §1498). The CFC on remand tried validity first, limiting infringement discovery due to state-secrets issues.
- The asserted reissue claims cover a method beginning with a previously oxidized and stabilized carbonizable fiber, selectively partially carbonizing it under Boyd’s discovered non‑linear relationship between heat treatment and resistivity, then forming homogeneous sheet products with preselected surface resistances.
- The CFC held claims 1–22 and 33–38 invalid for (1) inadequate written description (because the reissue claims omitted an explicit oxidation/stabilization step) and (2) obviousness based on expert reconstruction and prior-art references.
- The Federal Circuit majority here reversed both invalidity holdings: (a) found written‑description satisfied because the specification describes and identifies the known starting material and reissue broadening was permitted within two years, and (b) found no clear and convincing evidence of obviousness given the novelty of Boyd’s non‑linear resistivity/temperature relationship and the hindsight bias in the government expert’s reconstruction.
Issues
| Issue | Plaintiff's Argument (Zoltek) | Defendant's Argument (United States) | Held |
|---|---|---|---|
| Written description under 35 U.S.C. §112 | Reissue improperly broadened original by omitting oxidation/stabilization; specification must support elimination | Specification and prior art show starting material is known and described; reissue allowed to start from that known product | Rejected CFC: specification adequately describes starting material; reissue broadening within 2‑year window is permissible; written description satisfied |
| Obviousness under 35 U.S.C. §103 | Boyd discovered a novel non‑linear relationship not shown or suggested in prior art; not obvious to derive or use it to control sheet surface resistivity | Prior art and expert analysis (Rule of Mixtures reconstruction) render the claimed method obvious | Rejected CFC: government failed to show clear and convincing evidence; expert’s reconstruction relied on hindsight and post‑filed data and contained errors; non‑obviousness upheld |
| Burden and use of expert reconstruction | Zoltek: reconstruction used hindsight and data not available pre‑filing; unreliable | Government: expert is reputable and produced a reconstruction supporting obviousness | Court: expert’s errors and reliance on post‑dating data undermine probative value; hindsight bias disfavors obviousness finding |
| Bifurcation of trial (validity first, infringement later) | Zoltek: bifurcation and limits on infringement discovery improper | Government: state‑secret concerns and discretion to bifurcate supported limiting initial trial to validity | Court: CFC acted within discretion given circumstances; not reversible error |
Key Cases Cited
- Zoltek Corporation v. United States, 442 F.3d 1345 (Fed. Cir. 2006) (earlier Federal Circuit decision addressing extraterritorial practice and patent claims)
- Zoltek Corporation v. United States, 672 F.3d 1309 (Fed. Cir. 2012) (en banc) (holding U.S. liability under §1498 for contractor use with authorization and consent)
- KSR Int’l Co. v. Teleflex, Inc., 550 U.S. 398 (2007) (framework warning against hindsight and requiring rationale to combine prior art for obviousness)
- Graham v. John Deere Co., 383 U.S. 1 (1966) (set foundational Graham factors and warning against hindsight in obviousness analysis)
- Uniroyal, Inc. v. Rudkin‑Wiley Corp., 837 F.2d 1044 (Fed. Cir. 1988) (caution about courts finding obviousness using full litigation‑aided understanding)
- W.L. Gore & Associates, Inc. v. Garlock, Inc., 721 F.2d 1540 (Fed. Cir. 1983) (warning against imbuing skilled artisans with knowledge of the invention—hindsight risk)
- EWP Corp. v. Reliance Universal, Inc., 755 F.2d 898 (Fed. Cir. 1985) (obviousness requires evaluation of what the prior art would have suggested to a skilled artisan)
- Outside the Box Innovations, LLC v. Travel Caddy, Inc., 695 F.3d 1285 (Fed. Cir. 2012) (discussing pitfalls of litigation‑era reconstructions and hindsight)
- In re Skvorecz, 580 F.3d 1262 (Fed. Cir. 2009) (written description standard: must show possession as of filing date)
- Capon v. Eshhar, 418 F.3d 1349 (Fed. Cir. 2005) (written description applied in context of state of knowledge at filing)
- Space Sys./Loral, Inc. v. Lockheed Martin Corp., 405 F.3d 985 (Fed. Cir. 2005) (written description need not include information already known to skilled public)
- Enzo Biochem, Inc. v. Gen‑Probe Inc., 323 F.3d 956 (Fed. Cir. 2002) (written description is quid pro quo disclosure requirement)
- Centocor Ortho Biotech, Inc. v. Abbott Labs., 636 F.3d 1341 (Fed. Cir. 2011) (written description requires disclosure that conveys possession to skilled artisan)
- Alcon Research Ltd. v. Barr Labs., Inc., 745 F.3d 1180 (Fed. Cir. 2014) (insufficiency of evidence to show skilled artisan wouldn’t understand possession defeats written‑description challenge)
- InTouch Technologies, Inc. v. VGO Commc’ns, Inc., 751 F.3d 1327 (Fed. Cir. 2014) (criticizing reliance on patent itself as roadmap for obviousness combination)