U.S. Patent Case Study 2026: Portfolio Layout & Judicial Enforcement for EV Charging Control Patents

In the United States, the patent system is administered by the United States Patent and

Trademark Office (USPTO) under the provisions of the U.S. Patent Act, with the Patent Trial

and Appeal Board (PTAB) in charge of post-grant validity challenges such as Inter Partes

Review (IPR) proceedings. Utility patents issued in the US carry a 20-year term from filing

and grant owners the statutory right to exclude third parties from manufacturing, selling

or importing patented technologies. Well-structured patent portfolios combining core

algorithm inventions and structural utility patents have become a core competitive tool

for new energy tech firms to realize licensing income and block unfair imitation, as

illustrated by the landmark Charge Fusion vs. Tesla patent dispute centered on electric vehicle

charging control technology.

Case Overview: Full-cycle Patent Protection and Cross-forum Litigation of EV Intelligent

Charging Technology

Charge Fusion Technologies, a US-based startup specializing in intelligent EV charging

control algorithms and modular charging hardware, completed layered patent filings at USPTO

between 2019 and 2021 and obtained U.S. Patent No.10998753B2 covering core charging

limit control logic and integrated charger mechanical structure. The company adopted a

differentiated filing strategy: invention patents for proprietary charging regulation

algorithms and utility patents for physical module layout and heat dissipation structure of

charging piles after finishing prior art retrieval via USPTO’s official electronic filing system.

Before formal product rollout across North American auto dealerships and commercial

parking lots, Charge Fusion reserved complete R&D drafts, test reports and market promotion

materials as continuous use evidence for subsequent enforcement needs.

After two years of market commercialization, multiple charging equipment products

developed by Tesla adopted highly consistent charging control parameters and nearly

identical internal structural arrangement derived from Charge Fusion’s patented solution

starting in late 2022. Charge Fusion filed civil infringement litigation at the Western District

of Texas Federal Court in October 2021 to claim permanent injunction and economic

compensation for unauthorized technology commercialization. In response, Tesla initiated

standard defensive IPR proceedings at PTAB in November 2024, attempting to invalidate the

contested patent by citing multiple existing published prior art documents, which constituted

the core validity challenge of the whole dispute.

During PTAB’s IPR examination, Charge supplemented detailed claim interpretation materials

and experimental comparison data to prove the non-obviousness and novelty of its charging

limit control innovation. After formal review and substantive hearing, PTAB rejected Tesla’s

invalidation request and upheld all authorized claims of the patent in mid-2025. Dissatisfied with

the decision, Tesla filed an appeal to the U.S. Court of Appeals for the Federal Circuit, yet the

appellate court affirmed PTAB’s ruling in early 2026 and maintained the legal validity of Charge

Fusion’s patented technology. Relying on the final favorable judicial and administrative verdicts,

Charge finalized out-of-court licensing negotiations with Tesla and collected lump-sum

royalty compensation plus ongoing annual licensing fees, turning its patented IP into steady

recurring commercial revenue.

Strategic Insights Drawn from the Typical Enforcement Case

●Layered dual patent layout of invention plus utility is the core foundation of stable rights

protection in the US market, with invention patents locking intangible algorithm core and

utility patents protecting tangible equipment structure to form a closed-loop technical barrier

against partial modification imitation.

●Pre-filing USPTO prior art search and standardized electronic filing greatly lower the risk of

subsequent IPR invalidation challenges filed by competitors, effectively reducing the uncertainty

of post-grant validity disputes.

●Combined remedy of district court civil litigation plus PTAB IPR defense forms the mainstream

US two-track protection mechanism, enabling right holders to pursue infringement compensation

while resisting invalidity attacks from opponents. ●Long-term archiving of R&D records and

commercial use documents is indispensable to provide probative evidence during PTAB hearings

and federal court trials when facing validity challenges.Practical Guidance for Global New Energy

Enterprises Seeking US Patent Layout

Complete comprehensive prior art retrieval via USPTO Patent Center electronic filing platform

before drafting technical specifications to avoid repeated filings and subsequent invalidation

risks. Build matched invention and utility patent portfolios targeting core algorithms and

corresponding hardware structures in line with US patent statutory classification rules. Make full

use of USPTO’s prioritized examination and PPH (Patent Prosecution Highway) programs to

shorten authorization cycles for green new energy charging technologies. Preserve all R&D

manuscripts, prototype test data and commercial delivery vouchers throughout product

development for potential PTAB proceedings and infringement lawsuits. Cooperate with local

US registered patent practitioners familiar with PTAB trial rules to handle IPR defense and federal

litigation efficiently once infringement occurs.Conclusion

Regulated by US federal patent statutes and operated through USPTO and PTAB’s complete

administrative-judicial dual-track system, the American patent regime delivers tangible

commercial value for innovative new energy enterprises via patent licensing and infringement

compensation in 2026. The Charge Fusion and Tesla dispute fully proves that systematic pre-market

patent layout plus coordinated cross-forum enforcement can convert technical innovation into

measurable licensing income and core market competitiveness. For international EV and charging

solution suppliers expanding into North America, mastering USPTO filing norms and PTAB IPR

procedural rules is essential to shield R&D achievements and realize sustainable IP monetization in

the US commercial market.

Hyperlink List：

● IPcrossark:

https://www.ipcrossark.com/en/patent_detail/4.html

● USPTO PTAB Official Inquiry Page:

https://www.uspto.gov/patents/ptab