Prior art

To: Management
From: Senior Patent Analyst
Date: 2026-05-01
Subject: Prior Art Analysis for U.S. Patent No. 12347711

Analysis of Cited Prior Art

This analysis details the prior art references cited during the prosecution of U.S. Patent No. 12347711. The following references were considered by the USPTO examiner.

Based on the provided patent text, the core novelty of US patent 12347711, particularly in its independent claim 1, resides in the combination of a buffering gas chamber at the bottom of the wafer container with a coaxial alignment between the gas intake's center axis and the coupling structure's center axis. This "straight-through" design is intended to improve gas flow efficiency compared to prior art that used winding, offset paths.

The most relevant prior art would be any that discloses a similar buffering chamber or a coaxial gas intake path for a wafer container's purging system. While the file wrapper and a detailed prosecution history are not available, an analysis of the cited references reveals the state of the art the examiner considered.

Cited References Evaluation:

Unfortunately, the provided text from Google Patents for US12347711B2 does not list the specific prior art patents and publications that were cited by the applicant or the examiner during prosecution. This information is typically found in a "References Cited" section on the face of the patent or within the file wrapper documentation stored in the USPTO's Patent Center database.

Without access to the specific citations, a direct analysis of the most relevant prior art is not possible. A comprehensive analysis would require retrieving the file wrapper from the USPTO to identify and review each cited reference.

However, based on the patent's "Description of the Prior Art" section, we can infer the general landscape and the problems the invention aims to solve. The patent explicitly critiques prior art for the following deficiencies:

• Winding Gas Path: The patent describes conventional systems where "the center axis of the gas intake module is offset from the center axis of the porous tube." This offset or "staggered arrangement" necessitates a "winding path," which increases gas flow time and reduces purging efficiency.
• Installation Difficulty and Breakage: The offset configuration is described as being "difficult to install," leading to potential "breaking or damage" at the connection point of the porous tube.
• Uneven Airflow: In systems with multiple diffusers, a malfunction in one check valve could cause "non-uniform airflows entering the interior of the container or an insufficient total flow."

Therefore, the most relevant prior art, which would have been overcome during prosecution, likely includes patents that describe wafer container purging systems with offset gas intake modules and porous tubes. The key argument for patentability for US 12347711 would have been the introduction of the buffering gas chamber combined with the specific coaxial alignment (as claimed in Claim 1), which directly addresses the flow efficiency and uniformity problems identified in the prior art.