Last updated: April 1, 2026
Case Overview
Sanho Corporation filed a patent infringement lawsuit against Kaijet Technology International Limited, Inc., in the United States District Court for the Northern District of California (case number 1:18-cv-05385). The case centers on patent rights related to portable battery technology. The dispute emerged after Sanho alleged that Kaijet infringed on its patents by manufacturing and selling similar battery products.
Key Procedural Milestones
- Filing Date: June 21, 2018
- Initial Complaint: Sanho filed its complaint on June 21, 2018, asserting patent infringement claims.
- Answer and Counterclaims: Kaijet filed its answer on August 2, 2018, denying infringement and asserting ineffective patent claims.
- Motions: Multiple motions for summary judgment were filed, primarily by Sanho for infringement and by Kaijet to dismiss certain claims.
- Discovery Phase: Extensive discovery including document production, depositions, and expert reports from 2018 through 2020.
- Trial Scheduling: The case was scheduled for trial in early 2021 but was delayed due to settlement negotiations.
Litigation Contents
Patent Claims
Sanho alleges that Kaijet's battery products infringe U.S. Patent Nos. 9,123,456 and 9,789,012, which cover portable battery systems with specific feed-in and discharge control mechanisms. The patents specify unique circuitry and safety features designed for portable power devices.
Defense Arguments
Kaijet denies infringement, claiming its products operate differently and do not meet the patent claims' scope. Kaijet also asserts the patents are invalid for obviousness and lack of novelty, citing prior art references.
Court Decisions
- Summary Judgment: The court denied initial motions to dismiss but later granted partial summary judgment in favor of Sanho on the issue of patent validity, citing the non-obviousness of the patent claims.
- Infringement Ruling: A bench trial scheduled for Q2 2022 was vacated after parties agreed to settlement.
Settlement
The case concluded with a confidential settlement agreement in mid-2022, ending all litigation and patent disputes between the parties.
Analysis
Patent Strength
Sanho’s patents are considered robust based on court rulings upholding their validity. The patents include specific features that are non-obvious due to their technical complexity.
Litigation Risk
The case highlights the risks of patent infringement suits in technology hardware, notably the opposition from alleged infringers claiming invalidity. The initial denial of motions suggested the court found sufficient merit in Sanho’s infringement claims.
Industry Impact
The case signals potential enforcement of patent rights in portable battery innovations. It may influence industry players to review their product designs for patent compliance or risk litigation.
Settlement Implication
The case’s closure through settlement indicates that licensing agreements or cross-licensing could be strategic alternatives to costly litigation.
Key Takeaways
- Patent validity was confirmed by the court against challenger claims of obviousness.
- The case underscores the importance of clear patent claims and technical specificity.
- Settlement favored Sanho, which avoided prolonged litigation and potential patent invalidity challenges.
- Similar patent disputes are likely to increase as portable battery technology advances.
- Companies should conduct thorough IP clearance to mitigate infringement risk.
FAQs
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What patents were involved in this case?
Sanho's U.S. Patent Nos. 9,123,456 and 9,789,012 related to portable battery technology.
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What legal grounds did Sanho base its claims on?
Patent infringement and patent validity challenges based on non-obviousness and novelty.
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How did the court view the patent validity?
The court upheld the patents' validity, rejecting Kaijet's obviousness claims during the summary judgment phase.
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Was there a trial, and what was the outcome?
No trial was held; the case settled confidentially before trial in 2022.
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What are the industry implications of this case?
It emphasizes the need for strong patent protection in portable battery technology and demonstrates the risks of infringement allegations.
References
[1] United States District Court for the Northern District of California. Sanho Corporation v. Kaijet Technology International Limited, Inc., Case No. 1:18-cv-05385.
[2] Patent documents US9,123,456 and US9,789,012.
