Obviousness — US Patent 11871811

Obviousness Analysis Under 35 U.S.C. § 103

Under 35 U.S.C. § 103, a patent claim is invalid if the differences between the claimed invention and the prior art are such that the subject matter as a whole would have been obvious at the time the invention was made to a person having ordinary skill in the art (a "POSITA"). An obviousness rejection typically involves combining two or more prior art references to arrive at the claimed invention, provided there was a motivation to combine these references with a reasonable expectation of success.

The following analysis considers the independent claims of U.S. Patent No. 11,871,811 ('811 patent) in light of the prior art cited during its prosecution.

Analysis of Independent Claim 1

Claim 1 requires:

A sole and an upper.
A unitary stabilizer extending from the sole toward the rear of the foot opening.
A plurality of elastic elements (at least two) positioned forward of the rear portion.
These elastic elements must be separated by a non-elastic portion of the upper.

Primary Combination: Pratt ('632 Application) in view of Eull ('416 Patent)

A strong argument can be made that Claim 1 of the '811 patent would have been obvious over the combination of the '632 Application (U.S. 2017/0303632) and the '416 Patent (U.S. 9,629,416 B2).

Base Reference - '632 Application: The '632 application, by the same inventor, discloses the core concept of a rapid-entry shoe with a resilient heel frame that functions as a stabilizer. This frame is described as a "single continuous piece of material," which teaches the "unitary structure" limitation of Claim 1. It also clearly discloses a stabilizer extending from the sole portion to support the rear of the shoe and facilitate hands-free entry. What the '632 application lacks is a specific disclosure of multiple, separate elastic elements in the forward/side portion of the shoe's upper. Its focus is primarily on the action of the heel.
Secondary Reference - '416 Patent: The '416 patent explicitly teaches the use of multiple elastic gore panels (e.g., elements 26, 28 in Fig. 4) on the upper of a slip-on boot. These panels are inherently separated by the primary, non-elastic material of the upper (e.g., leather) and function to enlarge the shoe's opening for easier entry while maintaining a snug fit.
Motivation to Combine: A person of ordinary skill in the art, seeking to improve the rapid-entry shoe design of the '632 application, would be motivated to enhance the ease of entry and improve fit. While the rebounding heel of '632 addresses entry at the rear, a POSITA would recognize that resistance can also come from the instep or throat of the shoe. The use of elastic gores, as taught by the '416 patent, is a well-known and conventional solution in the footwear industry to create a more adaptable and easily expandable opening. A POSITA would naturally look to this established technique and incorporate the multiple, separated elastic gores from '416 into the upper of the '632 shoe. This combination would predictably result in a shoe with both a rebounding heel stabilizer and an expandable forward portion, thereby arriving at the invention claimed in Claim 1 with a reasonable expectation of success.

Conclusion for Claim 1: The combination of a unitary rear stabilizer ('632) with multiple, separate elastic elements in the upper ('416) is a logical and predictable assembly of known elements from the prior art to achieve the desired function of improved rapid entry. Therefore, Claim 1 appears to be vulnerable to an obviousness challenge.

Analysis of Independent Claim 10

Claim 10 requires:

A sole and an upper.
A unitary stabilizer extending from the sole toward the rear of the foot opening.
A plurality of elastic elements that facilitate flexion of the forward portion of the upper.
These elements include at least a first and a second elastic element, each with a longitudinal axis, where the axes are at different angles relative to a vertical axis.

Primary Combination: Pratt ('632 Application) in view of Eull ('416 Patent)

This combination is also potent against Claim 10. The analysis is similar to that for Claim 1, with an additional focus on the angular orientation of the elastic elements.

Base and Secondary References: As established above, the '632 application teaches the unitary stabilizer, and the '416 patent teaches the use of a plurality of elastic elements for ease of entry.
Motivation and Obviousness of Angular Orientation: The '416 patent's drawings (e.g., Fig. 4) depict elastic gores placed along the natural, curving lines of a shoe upper. A POSITA would understand that a shoe is a three-dimensional object with complex curvature. To place two separate elastic elements on the side or transition portion of an upper in a way that is both functional and aesthetically pleasing, it would be a matter of routine design choice to orient them at different angles to conform to the shoe's last and the anatomy of the foot. For example, one gore might be angled more vertically along the ankle, while another might be angled more horizontally over the instep. This arrangement is suggested by the positioning of elements 26 and 28 in the '416 patent. Therefore, arriving at an arrangement where the longitudinal axes of two elastic elements are at "different" angles would be an obvious and predictable result of applying the teachings of '416 to the shoe of '632.

Alternative Combination: Nike ('320 Patent) in view of Eull ('416 Patent)

An alternative, but also strong, argument could be made using the '320 Patent as the base reference.

Base Reference - '320 Patent: The '320 patent discloses a footwear article with a vertically extended heel counter that pivots or flexes to allow for easy entry, satisfying the "stabilizer" element.
Secondary Reference - '416 Patent: The '416 patent again provides the teaching of multiple, separated elastic gores.
Motivation to Combine: A designer starting with the pivoting heel of the '320 patent would be focused on creating a "hands-free" or "easy-on" experience. To complement the large opening created by the pivoting heel, they would be motivated to improve the fit and comfort around the instep. Incorporating the elastic gores from the '416 patent would be an obvious way to add flexibility and a secure fit to the forward part of the shoe, working in concert with the pivoting heel. The aformentioned design choice of angling these gores differently ('416) would be equally applicable in this combination.

Conclusion for Claim 10: Much like Claim 1, Claim 10 appears vulnerable under 35 U.S.C. § 103. The combination of a known rapid-entry heel stabilizer (from either '632 or '320) with the well-understood use of multiple, angled elastic gores for fit and entry (from '416) would have been obvious to a person of ordinary skill in the art at the time of the invention.