Invalidity dossier
US 11871811
Added 4/30/2026, 3:10:52 PM
⚖️ Active PTAB challenge: 1 pending proceeding against this patent
1 active — Inter Partes Review, Post-Grant Review, or Covered Business Method proceedings at the USPTO Patent Trial and Appeal Board.
Got a demand letter citing US 11871811?
Paste the full letter into the analyzer. We extract every asserted patent (this one and any others), characterize the asserter, flag validity vulnerabilities, and draft a sample response letter your attorney can adapt.
Generic sample response letter (PDF)
Generates a draft reply letter to a generic infringement claim citing this patent, using the analysis below. For a response tailored to a specific letter you received, use the demand letter analyzer instead. Sample only — not legal advice. Do not send without review by a licensed patent attorney.
Watchlist
Get alerted when this patent moves.
Email-only, free, anonymous. We'll notify you when US 11871811 gets a new lawsuit, a new PTAB proceeding, or a new dossier section. One-click unsubscribe from any alert.
Active provider: Google · gemini-2.5-pro
Auto-generating section 1 of 2: PTAB challenges…
Each section takes ~30-60s with web-search grounding. Keep this tab open — sections will fill in below as they complete.
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
An analysis of U.S. Patent No. 11,871,811 reveals the following information. No records of litigation involving this patent were found in the CAFC dockets as of the current date.
Summary of U.S. Patent No. 11,871,811
Title: Rapid-entry footwear having a stabilizer and an elastic element
Assignee: Fast IP LLC
Inventors: Michael Pratt, Craig Cheney
Filing Date: September 21, 2023
Issue Date: January 16, 2024
Abstract: A rapid-entry shoe having an elastic element to enlarge a foot opening of the rapid-entry shoe and also having a stabilizer to prevent a rear portion of the rapid-entry shoe from collapsing downward.
Plain-Language Overview of Independent Claims
This patent has two independent claims which outline the core-protected concepts:
Claim 1: This claim describes a "rapid-entry" shoe designed for easy foot insertion. The shoe features a sole and an upper body, which includes a front, side, and rear portion. A key component is a "stabilizer," a single, solid piece that extends from the sole up toward the back of the shoe's opening. This stabilizer provides support and prevents the heel area from collapsing when a person steps into the shoe. The shoe also includes at least two separate "elastic elements" located towards the front of the shoe. These elastic parts are separated by non-stretchy material and are designed to expand to make the shoe opening larger for easy entry, and then contract to secure the foot.
Claim 10: This claim also describes a rapid-entry shoe with a similar sole, upper, and a single-piece stabilizer. The main focus of this claim is on a plurality of elastic elements that are positioned to allow the front part of the shoe's upper to flex or pivot away from the sole, further easing foot entry. A specific detail of this claim is that at least two of these elastic elements are set at different angles relative to the vertical axis of the shoe.
Generated 4/30/2026, 3:11:37 PM