PATENT INFRINGEMENT ANALYSIS REPORT

Client: Confidential (U.S. Activewear Brand)
Subject: Seamless Knit Sports Bra – Design Patent Infringement
Competitor Product: Confidential (Asian Manufacturer, sold under private label)
Report Date: September 5, 2026
Prepared By: IP & Technology Law Group, New York

1. Executive Summary

This report presents a comparative analysis of the subject design patent (Patent No. US DXXX,XXX) and a competitor's product. The competitor product is a seamless knit sports bra manufactured in China and distributed under multiple private labels in the U.S. market.

Key Finding: The competitor product demonstrates substantial similarity to the patented design in at least seven of the eight design elements assessed. Based on the "ordinary observer" test and the "point of novelty" test, there is a reasonable basis to conclude that the competitor product infringes the subject design patent.

Recommendation: The client is advised to send a cease-and-desist letter to the competitor and to the manufacturer. If the competitor does not respond favorably, the client is advised to pursue legal action.

2. Patent Summary

Patent Details:

• Patent Number: US DXXX,XXX

• Title: Seamless Knit Sports Bra

• Issue Date: June 15, 2024

• Expiration Date: June 15, 2039

• Inventor: [Redacted]

• Assignee: [Client Name]

Claimed Design Elements (as shown in patent drawings):

3. Competitor Product Description

The competitor product was purchased from a U.S. retailer and analyzed in the lab. The product is manufactured by [Redacted] in Guangdong, China, and sold under the private label "[Redacted]."

Competitor Product Specifications:

4. Element-by-Element Comparison

4.1 Overall Silhouette

• Patent: Racerback with full coverage. Back straps converge at mid-back.

• Competitor: Racerback with full coverage. Back straps converge at mid-back.

• Assessment: Identical.

4.2 Seam Placement

• Patent: The design is characterized by the complete absence of side seams. The bra is knit in one continuous piece using a Santoni seamless knitting machine. The only seams present are the shoulder strap bindings.

• Competitor: The competitor product is also seamless. No side seams are present. The construction is continuous knit. The shoulder strap bindings are the only seams present.

• Assessment: Identical.

4.3 Underband

• Patent: The underband is an integral part of the knit structure, not an attached component. The width is 3.5cm. The knit pattern has a specific rib density of 1.2mm spacing.

• Competitor: The underband is integral to the knit structure. The width is 3.5cm. The rib spacing is 1.2mm.

• Assessment: Substantially identical.

4.4 Shoulder Strap

• Patent: The shoulder strap forms a 20° angle from the vertical axis. The strap has a specific curvature with three distinct radii.

• Competitor: The shoulder strap forms approximately 20° from the vertical axis. The strap curvature matches the patent curvature within 2mm tolerance.

• Assessment: Substantially identical.

4.5 Neckline

• Patent: U-shaped front neckline. The binding is 1.8cm wide. The neckline drop is 9.5cm from the top shoulder point.

• Competitor: U-shaped front neckline. Binding is 1.8cm wide. Neckline drop is 9.3cm from the top shoulder point.

• Assessment: Substantially identical.

4.6 Back Panel

• Patent: V-shaped back panel. The V-angle is 45°. The mesh knit insert covers the central V area. The mesh pattern is an open hexagonal structure.

• Competitor: V-shaped back panel. The V-angle is 44°. The mesh knit insert covers the central V area. The mesh pattern is an open hexagonal structure.

• Assessment: Substantially identical.

4.7 Knit Texture

• Patent: Alternating rib and mesh pattern across the chest panel. The rib section is 3.2cm wide. The mesh section is 2.8cm wide. The pattern repeats across the chest with a specific sequence: rib-mesh-rib-mesh.

• Competitor: Alternating rib and mesh pattern across the chest panel. The rib section is 3.1cm wide. The mesh section is 2.7cm wide. The pattern sequence is the same.

• Assessment: Substantially identical.

4.8 Hem

• Patent: Scalloped edge finish on the lower band. The scallop has a radius of 1.2cm and a depth of 0.6cm.

• Competitor: Scalloped edge finish on the lower band. Scallop radius is 1.2cm. Depth is 0.6cm.

• Assessment: Identical.

5. Legal Assessment

5.1 The "Ordinary Observer" Test

The U.S. design patent infringement standard uses the "ordinary observer" test: would an ordinary observer, giving the attention that a purchaser usually gives, consider the two designs substantially the same?

In this case, an ordinary observer would likely consider the two products substantially the same. The overall silhouette, the absence of side seams, the underband configuration, the shoulder strap angle, the neckline shape, and the back panel construction are visually indistinguishable.

5.2 The "Point of Novelty" Test

The "point of novelty" test asks whether the accused product incorporates the "point of novelty" of the patented design. The points of novelty in the subject patent are:

• The combination of the seamless construction with the specific knit texture (alternating rib/mesh pattern)

• The specific geometry of the shoulder strap and neckline

• The scalloped hem

All three points of novelty are present in the competitor product.

5.3 Analysis Summary

6. Supplier Identification

The competitor product is manufactured by:

Manufacturer Name: [Redacted]
Location: Guangdong, China
Registration: Established 2015
Customers: Multiple private labels in U.S., EU, and Australian markets

The manufacturer holds a Santoni seamless knitting license and produces for multiple brands. The same factory produces for both the client and the competitor.

Note: The supplier's relationship with the client is currently active. The client has placed orders with this manufacturer in the past 12 months.

7. Recommendations

Recommendation 1: Cease-and-Desist Letter

The client is advised to send a cease-and-desist letter to:

• The competitor brand (U.S. distributor)

• The manufacturer (Guangdong, China)

The letter should include:

• A copy of the patent

• A comparison table showing the similarities

• A request to cease production and distribution of the infringing product

• A demand for an accounting of profits from sales of the infringing product

• A deadline for response (14 days from receipt)

Recommendation 2: Supply Chain Action

The client should audit the manufacturer's compliance with the client's exclusivity agreements. If the manufacturer is producing an infringing product for a competitor, the client may have grounds for breach of contract, separate from the patent infringement claim.

Recommendation 3: Legal Action (If No Response)

If the competitor does not respond favorably to the cease-and-desist letter, the client is advised to file a patent infringement lawsuit in the U.S. District Court. The client should be prepared to seek an injunction and damages.

8. Appendix

Appendix A: Patent drawings (6 pages)
Appendix B: Competitor product photographs (12 pages)
Appendix C: Comparative side-by-side images (8 pages)
Appendix D: Knit texture micrographs (4 pages)
Appendix E: Supplier registration documents (3 pages)

Report Prepared By:

Thomas Chen, Esq.
IP & Technology Law Group
September 5, 2026

Reviewed By:

Susan Park, Esq.
Partner, IP & Technology Law Group
September 6, 2026

Confidentiality Notice: This report is prepared for the sole use of the client and is protected by attorney-client privilege. This report may not be shared with third parties without the written consent of IP & Technology Law Group.

A U.S. activewear brand commissioned this analysis after discovering a competitor's product with virtually identical se

Seamless knit sports bra. Competitor product with identical seam placement and knit structure. Full patent infringement analysis report. Recommendations included.

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