DuPont v. MacDermid Printing: The importance of a Patentee’s Pre-Filing Statements

by Dennis Crouch

A skilled patent attorney working with a qualified searcher could cobble together a colorable obviousness argument against the vast majority of issued patent claims.  Part of the difficulty for patentees stem from the the billions of prior art references available via increasingly effective search tools. Even when an invention results from a ‘flash of genius,’ patent law typically back-fills extensive knowledge for the obviousness analysis – even when that knowledge was not actually available at the time of the invention.  The larger difficulty though is likely the large number of hard-to-pin-down facts such as the motivations, common sense, and level of creativity of a person having ordinary skill in the art.

The “expansive and flexible” approach to nonobviousness is frustrating to many, but it is seen as a feature of the system fully supported by the Supreme Court.  In KSR, the court wrote:

Throughout this Court’s engagement with the question of obviousness, our cases have set forth an expansive and flexible approach. . . . Rigid preventive rules that deny fact finders recourse to common sense… are neither necessary under our case law nor consistent with it.

KSR v. Teleflex (2007) [04-1350].  Conventional wisdom post-1980 has been that the factual inquiry makes summary judgment of obviousness difficult for a patent challenger.  Rather, obviousness goes to the jury.  Since KSR, that attitude has shifted somewhat.  (The even newer model is that obviousness goes to the PTO in an IPR proceeding – save that for a different essay).

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Summary Judgment of Obviousness: In DuPont v. MacDermid Printing (Fed. Cir. 2016) [15-1777], the NJ district court granted summary judgment of obviousness against the patentee DuPont – holding that the asserted claims of DuPont’s U.S. Patent 6,773,859 invalid under 35 U.S.C. 103.   The ‘859 patent relates to the manufacture of  a flexo plate for digital printing — a plate used to print digital images on flexible materials.   The claimed advance involves heating-up the plate to remove unpolymerized material (rather than using a harsh solvent).

The obviousness case combines two prior art references: “Martens [a 3M patent] teaches a process for developing an analog plate using heat” and “Fan [DuPont patent] teaches developing a digital plate using solvents.”   The inventor (Roxy Fan) is also the first named inventor of DuPont’s ‘859 patent being challenged in this case. The Fan prior-art patent, however, was filed a decade prior.  Reviewing these two references, the court found that the ‘859 patent uses “the same technology and processes pertaining to digital imaging” previously disclosed by Fan and the same thermal development process disclosed in Martens.  In finding a motivation-to-combine these references, the district court walked through several factors.

• Limited set of potential combinations: The prior art only had two imaging styles (digital and analog) and four development techniques (thermal, etc.) – this makes the ‘859 combination more likely obvious to try.
• Benefits of Moving to Digital: The prior art taught benefits of switching to digital (thus suggesting the substitution), including an article published by DuPont
• Market Incentive: DuPont marketing material suggest a “strong incentive” to combine the thermal process with digital plates.

The district court also rejected DuPont’s evidence of commercial success, longfelt need, and industry praise – finding them insufficient to overcome the “strong showing of obviousness.”

On appeal of this summary judgment finding, DuPont focused on the standard-of-review – noting that the district court had failed to “draw reasonable inferences” in its favor.  In the process, DuPont pointed to a long list of factual disputes between the parties where it would be reasonable to draw different conclusions from the evidences.

The Federal Circuit affirmed – finding that the strong undisputed evidence of prior art and motivation to combine fully supported the summary judgment finding.

[T]he record contains strong evidence that a skilled artisan would have had a reason to combine two known technologies and would have had a reasonable expectation of success in doing so. Indeed, DuPont itself promoted the digital and thermal technologies as technological breakthroughs in prior art publications. Thus, in view of the record as a whole, even drawing all justifiable inferences in favor of DuPont, the objective evidence is insufficient to preclude summary judgment on the ultimate legal conclusion of obviousness.

Doomed by Its Own Prior Statements: The obviousness case against DuPont here is interesting because (1) one of the core prior art references was a DuPont reference and (2) DuPont’s own statements regarding its prior inventions led to the motivation-to-combine finding.  DuPont’s private case study will likely walk through and consider whether it should have taken a different pathway regarding the public disclosures.

Caveat: Although the patentee’s pre-filing disclosures are important – it is also important to remember that the question of obviousness is an objective analysis focusing on the hypothetical mind of a person having ordinary skill in the art.  What this means is that the patentee’s disclosures are should not be treated as “party admissions” and given special treatment in the obviousness analysis.  Rather, the disclosures are simply added to the body of knowledge available to the artisan.  Here, the Federal Circuit came dangerously close to crossing the line into giving information actually available to and created by DuPont special weight in the obviousness analysis.