LAW OFFICE OF
CHARLES C. LIU
U.S. IP & E-Commerce Counsel for Global Sellers

California-licensed attorney and USPTO registered practitioner, focusing on patents, trademarks, and platform compliance for cross-border e-commerce businesses (including Amazon and other major marketplaces).

专注服务中国及全球跨境卖家,提供“不侵权法律意见”“平台投诉应对”“专利中立评估应诉” 等专业法律服务,帮助卖家在美国市场安全合规地长期经营

About the Firm / 律所简介

A boutique U.S. law office dedicated to intellectual property and cross-border e-commerce platform compliance.

Professional Background / 专业背景

The Law Office of Charles C. Liu focuses on helping Amazon and other e-commerce sellers navigate the complexities of U.S. intellectual property law. With extensive experience in patent and trademark disputes, platform IP complaints, and non-infringement opinions, the firm provides practical, business-oriented solutions rather than abstract legal theory.

律所长期服务于跨境电商卖家,熟悉亚马逊、Temu、Walmart 等平台的合规规则。 通过细致的技术比对和法律分析,为卖家出具不侵权报告、 协助应对专利/商标投诉,并帮助卖家从根本上完善合规体系。

Typical Clients / 典型客户

  • Amazon, Walmart, Temu, eBay, AliExpress sellers
  • 跨境工厂型卖家、品牌方、精品路线卖家
  • 遭遇专利/商标投诉的链接运营团队
  • 准备进入美国市场、需要前期 IP 评估的中国企业

Service Philosophy / 办案理念

Evidence-driven · Technically rigorous · Business-focused. Each matter is approached with detailed technical comparison charts, clear written opinions, and a focus on reducing operational risk for the client’s entire catalog.

我们坚持:用工程师的视角读专利、用平台的语言写报告、用卖家的思维做方案, 既要在法律层面严谨合规,又要兼顾店铺运营和商业回报。

Practice Areas / 业务领域

Focus on intellectual property, platform compliance, and non-infringement opinions for cross-border e-commerce sellers.

  • Utility & design patent non-infringement opinions (美国发明/外观专利不侵权法律意见)
  • Patent validity / invalidity analysis (专利稳定性、可撤销性分析)
  • Trademark & trade dress clearance and infringement analysis (商标/装潢侵权分析)
  • Amazon Patent Neutral Evaluation representation (亚马逊专利中立评估程序应诉/发起)
  • Platform IP complaints defense (专利、商标、版权投诉申诉及反驳报告)
  • Product comparison & claim charting (产品和专利权利要求逐点比对图)
  • Non-infringement reports for Amazon, Walmart, Temu, eBay等平台
  • IP risk review for new listings and product lines (上新前 IP 风险体检)
  • Cross-border IP strategy for Chinese manufacturers / brands
  • Coordination with local counsel for U.S. litigation (配合美国诉讼律师团队)
Bed rails & furniture hardware RC toys & consumer electronics Home & kitchen products Sporting goods & outdoor Clothing, footwear, accessories

Why Sellers Choose Charles C. Liu / 选择本所的理由

Combining deep IP knowledge, platform experience, and bilingual communication.

IP + Platform Dual Perspective / 双视角

Deep understanding of U.S. patent and trademark law, combined with practical experience dealing with Amazon and other platforms. Reports are written to be both legally rigorous and easy for platform teams to digest.

Technical, Evidence-Based Analysis / 工程师式比对

Each non-infringement opinion includes structured claim charts, annotated product images, and clear “difference points” that highlight why the accused product falls outside the patent or mark.

Bilingual Support / 中英文双语服务

Able to communicate directly with Chinese seller teams in Mandarin while preparing English-language reports for platforms, opposing counsel, or courts.

Seller-Friendly Turnaround / 符合运营节奏

For urgent takedowns or patent neutral evaluations, the firm offers expedited review and staged deliverables so that listings can return to normal operation as quickly as possible.

Representative Non-Infringement Opinions / 不侵权报告典型案例

Below are anonymized examples of prior matters. Past results do not guarantee similar outcomes in future cases.

Amazon US · Utility Patent Complaint
Bed Sheet Holder vs. U.S. Utility Patent
Result: Complaint withdrawn; listings reinstated

Prepared a detailed non-infringement opinion demonstrating fundamental structural differences between the client’s clamp-style bed sheet holder and the asserted sliding-strip patent. The report was submitted to Amazon and opposing counsel, leading to withdrawal of the complaint and restoration of the ASINs.

Utility patent Home & bedding Amazon complaint defense
Amazon US · Design Patent Complaint
Eyewear Frames Design Patent Dispute
Result: Complaint not pursued after response

Conducted an element-by-element comparison under the “ordinary observer” test, highlighting differences in lens shape, bridge configuration, and temple geometry. The written opinion and annotated exhibits persuaded the patent owner not to pursue further action, and the client’s listings remained active.

Design patent Eyewear Ordinary observer analysis
Amazon US · Patent Neutral Evaluation
Protective Plate Mounting System
Result: Patent owner declined to proceed

Represented a seller in Amazon’s Patent Neutral Evaluation program over a mounting structure for TV protective plates. By preparing a concise but technically detailed non-infringement brief and claim charts, the client showed that its product used a materially different locking mechanism, leading the patent owner to withdraw from the evaluation.

Neutral evaluation Consumer electronics Mechanical structure
Amazon EU · Trademark / Trade Dress
Hydraulic Door Closer Trade Dress Claim
Result: Platform accepted non-infringement position

Analyzed a U.S. configuration mark covering a tubular tire-iron-shaped tool and compared it to the client’s hydraulic door closer. The opinion explained why the protected configuration differed in overall appearance, function, and market context, leading Amazon to maintain the client’s listings.

Trade dress Trademark Hardware
Amazon US · Design Patent Complaint
Travel Bag Organizer Design
Result: Listings reinstated after appeal

Prepared a design non-infringement report for a travel bag organizer, emphasizing differences in panel layout, pocket configuration, and fastening systems. Using side-by-side visuals and structured “difference points,” the seller successfully appealed and recovered the suspended ASINs.

Design patent Soft goods Amazon appeal
Multi-Platform · Pre-Launch Review
IP Risk Audit for RC Toy Product Line
Result: Clean launch; no IP complaints

For a manufacturer planning simultaneous launches on Amazon, Walmart, and Temu, the firm conducted prior-art and patent landscape checks, reviewed competitor patents, and issued non-infringement assessments for key SKUs. The client launched successfully without receiving IP complaints during the initial sales period.

IP risk audit RC toys Multi-platform

*The examples above are anonymized and for illustrative purposes only. Past results do not guarantee a similar outcome in future matters. Each case depends on its own facts and applicable law.

Contact / 联系方式

To request a non-infringement opinion, neutral evaluation defense, or other IP-related assistance, please provide basic information about your situation.

Law Office of Charles C. Liu

2406 Thousand Oaks Blvd

Thousand Oaks, CA 91362, USA

Email: contact@charlesliulaws.com

USPTO Reg. No.: 53,226

请在邮件或表单中附上:
· 被投诉 ASIN / 链接平台和站点
· 投诉方的专利号或商标注册号(如已知)
· 产品图片、功能说明及是否有现有报告/申诉材料
以便律所进行初步评估并回复可行方案与预计费用。