In re Zhengxu He — Federal Circuit Affirms PTAB Obviousness Rejection of Automated Kitchen System Patent

Background

Zhengxu He, a pro se inventor based in Reno, Nevada, sought a patent on an automated kitchen system designed to transport and dispense food ingredients between a storage station and a cooking station using mini vehicles. His application (U.S. Patent Application No. 16/997,933) claimed a system comprising a storage station with a gripper-based container transfer apparatus, a cooking station with a dispensing apparatus, and vehicles that shuttle ingredient containers between the two stations.

The USPTO examiner rejected claims 1–22 as obvious over a combination of two prior art references: Buehler (an automated kitchen with ingredient storage modules and a robotic manipulator) and He ‘660 (a prior He application disclosing an ingredient cart-unloading apparatus with mini vehicles that stop at storage and cooking stations). The examiner found that a skilled artisan would have been motivated to combine the two references to achieve the documented benefits of He ‘660, including automated delivery of ingredients, minimized space requirements, reduced idle time, and lower labor costs. The Patent Trial and Appeal Board (PTAB) affirmed the rejection, and He appealed to the Federal Circuit.

The Court’s Holding

The Federal Circuit affirmed in a nonprecedential per curiam opinion. He raised three main arguments, all of which the court rejected.

First, He argued that the motivation to combine was not supported by substantial evidence because the identified benefits in He ‘660 did not apply to Buehler. The court disagreed, finding that He ‘660 explicitly disclosed the benefits of automation, space efficiency, and reduced labor, and that the examiner had specifically explained how incorporating He ‘660’s mini vehicles into Buehler’s system would achieve those benefits.

Second, He argued that the proposed modification would not work because He ‘660’s engagement bars would physically interfere with Buehler’s rotating storage shelves. The court rejected this as based on a misunderstanding of the obviousness inquiry: “[t]he test for obviousness is not whether the features of a secondary reference may be bodily incorporated into the structure of the primary reference, but rather what the combined teachings of those references would have suggested.” (quoting In re Keller, 642 F.2d 413, 425 (CCPA 1981)). The Board’s finding that a skilled artisan could attach engagement bars to Buehler’s containers without preventing the combination was supported by substantial evidence.

Third, He argued that the Board violated the Administrative Procedure Act by failing to adequately respond to his arguments. The court found no APA violation — the Board had directly addressed each of He’s contentions and explained why it found them unpersuasive.

Key Takeaways

• The test for obviousness is what the combined teachings of the prior art would suggest to a person of ordinary skill — not whether a secondary reference can be physically incorporated into the primary reference wholesale.
• A prior art reference’s explicitly stated benefits (efficiency, automation, space savings) can provide strong motivation to combine even if those benefits are described in one reference but not the other.
• APA compliance in PTAB appeals requires the Board to meaningfully respond to the applicant’s arguments — but the Board is not required to accept those arguments, only to engage with them.

Why It Matters

This nonprecedential decision is a routine affirmance of a PTAB rejection, but it illustrates the well-settled principle that obviousness analysis focuses on what a skilled artisan would learn from reading prior art together, not on whether elements can be physically transplanted. Inventors and practitioners who argue that proposed combinations would not work mechanically must address the entire set of combined teachings, not merely one possible physical configuration. For robotics and automated systems inventors, this case underscores that prior art in adjacent automation domains can readily supply motivation to combine.