Prior art — US Patent 9402120

Analysis of Prior Art for U.S. Patent 9,402,120: Wireless Earbuds

This report details the most relevant prior art cited in U.S. Patent 9,402,120, titled "Wireless earbuds," which was granted on July 26, 2016. The analysis focuses on references that could potentially anticipate the claims of the patent under 35 U.S.C. § 102, which pertains to novelty.

The core invention of patent 9,402,120 lies in the specific arrangement of components within a compact, cylindrical wireless earbud. Key claims revolve around the successive, coaxial alignment of a loudspeaker, a rechargeable battery, a main printed circuit board (PCB), and a charging interface member along the earbud's longitudinal axis. This design aims to achieve a small and efficient form factor.

Key Prior Art and Potential Anticipation of Claims

The following prior art references, cited by the patent examiner, are most relevant to the core claims of US Patent 9,402,120.

U.S. Patent 8,867,758 B2: "Headset electronics"

Full Citation: US 8,867,758 B2
Publication Date: October 21, 2014 (Filed: January 5, 2007)
Assignee: Apple Inc.
Brief Description: This patent from Apple describes a headset with a housing containing various electronic components. It discloses the general concept of integrating electronics, including a power source and a speaker, within a small earpiece. The internal layout, however, is not as rigidly defined as in the '120 patent.
Potential Anticipation of Claims:
- Claim 1: This reference could be argued to anticipate the broader elements of Claim 1, which requires an earbud housing with a loudspeaker, a rechargeable battery, and a main PCB. However, the '758 patent may not explicitly disclose the specific "successive order along the longitudinal main axis" as claimed in the '120 patent. The arrangement in the '758 patent's figures appears less linear and more compact in a different configuration.

U.S. Patent Application Publication 2014/0140529 A1: "Earphone"

Full Citation: US 2014/0140529 A1
Publication Date: May 22, 2014 (Filed: November 20, 2012)
Assignee: Hon Hai Precision Industry Co., Ltd.
Brief Description: This application details an earphone structure that includes a housing, a speaker unit, a circuit board, and a battery. The figures show a generally linear arrangement of these components within the earphone body.
Potential Anticipation of Claims:
- Claim 1 & 2: This reference presents a stronger case for anticipation of the core structural claims. The described arrangement of the speaker, circuit board, and battery within a cylindrical housing closely resembles the "successive order" and "coaxially disposed" limitations of claims 1 and 2 of the '120 patent. The primary distinction may lie in the specific nature and placement of the "charging interface member."

U.S. Patent 8,515,103 B2: "3D stereo earphone with multiple speakers"

Full Citation: US 8,515,103 B2
Publication Date: August 20, 2013 (Filed: December 29, 2009)
Assignee: Cyber Group USA Inc.
Brief Description: This patent focuses on an earphone with multiple speakers to create a 3D audio effect. While the primary innovation is acoustic, the patent discloses the internal arrangement of components, including speakers and circuit boards, within the earphone housing.
Potential Anticipation of Claims:
- Claim 1: Similar to the '758 patent, this reference teaches the inclusion of the fundamental components within an earbud. The anticipation of Claim 1 would depend on whether the arrangement shown in the '103 patent's drawings could be interpreted as being in a "successive order along the longitudinal main axis."

U.S. Patent 8,891,800 B1: "Earbud charging case for mobile device"

Full Citation: US 8,891,800 B1
Publication Date: November 18, 2014 (Filed: February 21, 2014)
Assignee: Jonathan Everett Shaffer
Brief Description: This patent is primarily directed towards a charging case for earbuds. However, in describing the earbuds that would be used with the case, it implicitly discloses the need for charging contacts on the earbuds themselves.
Potential Anticipation of Claims:
- Claims 5-11: These claims in the '120 patent relate to the charging interface member and its connection to the main PCB. The '800 patent, by describing a charging case that interacts with earbuds, inherently suggests the presence of a charging interface on the earbud. While it may not detail the specific structure of the interface as claimed (e.g., a conductive pattern on a circuit board substrate at the rear of the earbud), it establishes the concept of an external charging interface on a wireless earbud.

Summary of Analysis

The prior art cited against U.S. Patent 9,402,120 establishes that the general concept of incorporating a power source, speaker, and electronics within a wireless earbud was known. The most significant challenge to the novelty of the '120 patent's claims, particularly claims 1 and 2, comes from US 2014/0140529 A1, which discloses a very similar linear arrangement of internal components. The patentability of the '120 patent likely hinged on the specific, detailed arrangement of all four claimed elements (loudspeaker, battery, PCB, and charging interface) in a successive and coaxial manner, which may not have been explicitly and entirely disclosed in a single prior art reference. The claims related to the charging interface find a conceptual basis in patents like US 8,891,800 B1, which, while focused on the case, necessitate a corresponding charging mechanism on the earbud itself.