Teaching Away

Teaching away is a doctrine under 35 U.S.C. § 103 that weighs against a finding of obviousness when a prior art reference expressly discourages or teaches against the modification or combination that would result in the claimed invention. The rationale: if the prior art led skilled artisans away from the claimed combination, they would not have been motivated to make the combination, undermining the obviousness argument. A prior art reference 'teaches away' from a combination if it: (1) expressly criticizes or warns against a modification or combination; (2) suggests that modifications or combinations in the direction of the claimed invention would cause problems, produce inferior results, or be undesirable; (3) leads skilled artisans to conclude the proposed modification would not work or would be unacceptable. Teaching away is both a prosecution argument (to overcome a § 103 rejection) and a litigation defense (to rebut an obviousness challenge).

In re Gurley (Fed. Cir. 1994) is the seminal case on the strength of teaching-away evidence. The court held: a prior art reference 'teaches away' from a claimed combination when it would lead a skilled artisan to CHOOSE A DIFFERENT APPROACH rather than the claimed one. KEY PRINCIPLES from Gurley: (1) A reference that simply does not mention a combination does NOT teach away from it — silence is not discouragement; (2) A reference that describes one alternative among many does not necessarily teach away from the other alternatives; (3) A reference must AFFIRMATIVELY DISCOURAGE the combination to teach away — it must say or imply that the combination should not be made, or that it would produce inferior or unacceptable results; (4) DEGREE MATTERS — a mild suggestion of inferiority may not overcome a strong motivation to combine from other prior art; a clear warning of danger or unworkability is stronger evidence of teaching away. Gurley also noted: 'a teaching that a particular combination should be avoided' is stronger than 'a teaching that an alternative is preferred.'

Teaching away is a factor that weighs against obviousness but does not automatically defeat an obviousness rejection. The analysis is a totality-of-the-circumstances weighing under Graham v. John Deere (S.Ct. 1966) and KSR. Factors that determine the weight of teaching-away evidence: (1) STRENGTH OF THE TEACHING AWAY — an express warning ('this approach will fail') weighs more heavily than a preference for an alternative ('approach B is preferred for these applications'); (2) SPECIFICITY — the more directly the prior art addresses the specific modification at issue, the more weight it carries; (3) STRENGTH OF THE MOTIVATION TO COMBINE — if other prior art provides very strong motivation to combine, even teaching-away evidence may not overcome it; (4) UNEXPECTED RESULTS — teaching away combined with unexpected results (the combination works despite discouragement) can be a powerful combination of secondary considerations; (5) KSR FLEXIBILITY — post-KSR, courts give more flexibility to the motivation inquiry; a skilled artisan is presumed to be able to overcome known obstacles when the overall case for combination is strong.

Teaching away and unexpected results are often used together as a powerful combined secondary-consideration argument: (1) TEACHING AWAY establishes that skilled artisans would not have made the claimed combination because prior art discouraged it; (2) UNEXPECTED RESULTS establishes that even if made, the combination produces results beyond what would have been expected; (3) TOGETHER: the combination was discouraged (teaching away) AND when it was made, it produced surprisingly superior results (unexpected results) — this double-layered argument is particularly persuasive because it suggests both that the invention was non-obvious to attempt AND non-obvious in its outcome. Example: if prior art references suggest that combining high-temperature treatment with a specific material reduces product quality, and the inventor shows the combination actually improves quality substantially, both teaching-away (discouragement) and unexpected results (superior outcome) support patentability. The nexus requirement applies to both: the teaching away must be directed at the specific claimed combination, and the unexpected results must be attributable to the claimed features.

Yes — a reference can simultaneously provide some motivation toward a combination while also cautioning against it, and courts weigh all the teachings together. This occurs when: (1) A reference describes multiple approaches, prefers one, but also mentions another — the mention provides some motivation but the preference may count as teaching toward the preferred approach (not away from the mentioned one); (2) A reference warns of problems in certain conditions but not universally — a skilled artisan might be motivated to try the combination in conditions where the prior art's warnings do not apply; (3) A reference suggests inferiority in some aspects while acknowledging advantages in others — partial teaching away must be weighed against partial motivation. In re Fulton (Fed. Cir. 2004): a prior art preference for one approach does not necessarily teach away from alternatives unless it 'clearly discourage[s]' their use. The key question: would a reasonable skilled artisan, reading all the prior art together, have been motivated to try the claimed combination despite the cautionary language? If yes, teaching away may not be enough.