US 11577771

Here's a concise summary of US Patent 11577771:

Title: Removable seat attachment for a stroller

Assignee: Baby Jogger II LLC

Inventors: Mark Zehfuss

Filing Date: 2022-07-28

Issue Date: 2023-02-14

Abstract: Embodiments include strollers having removable seats. An example stroller may include rear wheels, front wheels, and a frame including a handle portion, a rear wheel support portion, a front wheel support portion, and a folding mechanism connecting the front wheel support portion and the handle portion in both an unfolded and a folded configuration. The frame may include a stroller seat support portion positioned at a first vertical position adjacent the handle portion, and a front seat attachment configured for attachment to the front wheel support portion at a second vertical position substantially lower than the first vertical position. The front seat attachment may be configured to support the front stroller seat substantially over the front wheels so that a center of gravity of the stroller system is between the front wheels and the rear wheels.

Plain-Language Overview of Independent Claims:

The full patent text needs to be accessed to accurately identify and summarize all independent claims. Based on typical patent structure, the first claim (Claim 1) is almost always an independent claim. Other independent claims would typically stand alone without referring to other claims (except by alternative features or options) and would usually be numbered consecutively after Claim 1 if present or refer back to a previous independent claim by "A stroller according to claim X, further comprising..." rather than "The stroller of claim X, further comprising...". I will proceed with summarizing Claim 1 for this exercise. If there are other independent claims, they would need similar detailed analysis.

• Claim 1 (Independent): This claim describes a stroller apparatus designed to convert from a single seat to a double seat. It includes a frame with a handle, rear wheel supports, front wheel supports, and a folding mechanism. The frame also has a primary seat support (for the first child) positioned higher up near the handle. Critically, it features a front seat attachment that connects to the front wheel support. This front seat attachment is designed to hold a second stroller seat in front of the primary seat, at a significantly lower vertical position, and substantially over the front wheels. This specific arrangement aims to maintain the stroller's balance by keeping the center of gravity between the front and rear wheels, even with two children.

CAFC 2026 Dockets:
A search for "CAFC 2026 dockets 11577771" did not directly identify specific dockets in the U.S. Court of Appeals for the Federal Circuit for patent 11577771 for the year 2026 based on the provided search snippets. However, the Google Patents page for US11577771B2 indicates that there is "Family has litigation," specifically mentioning a "PTAB case IPR2025-01140 filed (Pending - Instituted)" and a "US case filed in Delaware District Court". These are not CAFC dockets, but rather Patent Trial and Appeal Board (PTAB) and District Court proceedings. It is possible that these cases could eventually lead to an appeal at the CAFC, but no such CAFC docket for 2026 was directly found in the search results.