Toyo Co., Ltd. v. First Solar, Inc.

5:26-cv-10832

Overview

Case Number 5:26-cv-10832

Filing Date 2026-09-23

Status Litigation filed

Court District Court, N.D. California (cand)

Nature of Suit 830 Patent

Jurisdiction Type Federal Question

Cause of Action 28:1338 Patent Infringement

Jury Demand Plaintiff

Parties

Defendant

First Solar, Inc.

Represented By

0 Attorneys Listed

No attorneys available

Plaintiff

Vietnam Sunergy (Bac Ninh) Company Limited

Represented By

2 Attorneys Listed

Irene Inkyu Yang

Sidley Austin LLP

Tel: +1 (415) 772-1200

101 California Street, Suite 3500, San Francisco, CA 94111

Tung Nguyen

Sidley Austin LLP

Tel: +1 (214) 981-3478

Fax: +1 (214) 981-3400

2323 Cedar Springs, Suite 2600

Vietnam Sunergy Joint Stock Company

Represented By

2 Attorneys Listed

Irene Inkyu Yang

Sidley Austin LLP

Tel: +1 (415) 772-1200

101 California Street, Suite 3500, San Francisco, CA 94111

Tung Nguyen

Sidley Austin LLP

Tel: +1 (214) 981-3478

Fax: +1 (214) 981-3400

2323 Cedar Springs, Suite 2600

VSUN Solar USA Inc.

Represented By

2 Attorneys Listed

Irene Inkyu Yang

Sidley Austin LLP

Tel: +1 (415) 772-1200

101 California Street, Suite 3500, San Francisco, CA 94111

Tung Nguyen

Sidley Austin LLP

Tel: +1 (214) 981-3478

Fax: +1 (214) 981-3400

2323 Cedar Springs, Suite 2600

Toyo Solar Texas LLC

Represented By

2 Attorneys Listed

Irene Inkyu Yang

Sidley Austin LLP

Tel: +1 (415) 772-1200

101 California Street, Suite 3500, San Francisco, CA 94111

Tung Nguyen

Sidley Austin LLP

Tel: +1 (214) 981-3478

Fax: +1 (214) 981-3400

2323 Cedar Springs, Suite 2600

Toyo Solar Manufacturing One Member Private Limited Company

Represented By

2 Attorneys Listed

Irene Inkyu Yang

Sidley Austin LLP

Tel: +1 (415) 772-1200

101 California Street, Suite 3500, San Francisco, CA 94111

Tung Nguyen

Sidley Austin LLP

Tel: +1 (214) 981-3478

Fax: +1 (214) 981-3400

2323 Cedar Springs, Suite 2600

TOPTOYO Investment Pte. Ltd.

Represented By

2 Attorneys Listed

Irene Inkyu Yang

Sidley Austin LLP

Tel: +1 (415) 772-1200

101 California Street, Suite 3500, San Francisco, CA 94111

Tung Nguyen

Sidley Austin LLP

Tel: +1 (214) 981-3478

Fax: +1 (214) 981-3400

2323 Cedar Springs, Suite 2600

Toyo Co., Ltd.

Represented By

2 Attorneys Listed

Irene Inkyu Yang

Sidley Austin LLP

Tel: +1 (415) 772-1200

101 California Street, Suite 3500, San Francisco, CA 94111

Tung Nguyen

Sidley Austin LLP

Tel: +1 (214) 981-3478

Fax: +1 (214) 981-3400

2323 Cedar Springs, Suite 2600

Court & Judges

Court

District Court, N.D. California (cand)

Patents Involved

No asserted patent numbers detected in initial docket filings yet.

Docket Entries

COMPLAINT FOR DECLARATORY JUDGMENT against First Solar, Inc. ( Filing fee $ 405, receipt number ACANDC-22501916.). Filed by Vietnam Sunergy Joint Stock Company, Toyo Solar Manufacturing One Member Private Limited Company, Vietnam Sunergy (Bac Ninh) Company Limited, TOPTOYO Investment Pte. Ltd., Toyo Co., Ltd., Toyo Solar Texas LLC, VSUN Solar USA Inc.. (Attachments: # 1 Exhibit A, # 2 Exhibit B, # 3 Exhibit C)(Yang, Irene) (Filed on 9/23/2026) (Entered: 09/23/2026)

2026-09-23

Download

Proposed Summons. (Yang, Irene) (Filed on 9/23/2026) (Entered: 09/23/2026)

2026-09-23

View

REPORT on the filing or determination of an action regarding a Patent or Trademark (cc: form mailed to register). (Yang, Irene) (Filed on 9/23/2026) (Entered: 09/23/2026)

2026-09-23

View

Rule 7.1 Disclosures by TOPTOYO Investment Pte. Ltd., Toyo Co., Ltd., Toyo Solar Manufacturing One Member Private Limited Company, Toyo Solar Texas LLC, VSUN Solar USA Inc., Vietnam Sunergy (Bac Ninh) Company Limited, Vietnam Sunergy Joint Stock Company identifying Other Affiliate TOPTOYO Investment Pte. Ltd. for Toyo Co., Ltd., Toyo Solar Manufacturing One Member Private Limited Company; Other Affiliate Vietnam Sunergy Joint Stock Company for VSUN Solar USA Inc., Vietnam Sunergy (Bac Ninh) Company Limited; Other Affiliate TOYO Holdings LLC for TOPTOYO Investment Pte. Ltd.; Other Affiliate Abalance Corporation for Vietnam Sunergy Joint Stock Company; Other Affiliate TOYO Solar LLC for Toyo Solar Texas LLC. (Yang, Irene) (Filed on 9/23/2026) (Entered: 09/23/2026)

2026-09-23

View

Toyo Co., Ltd. v. First Solar, Inc.

Overview

Parties

Defendant

First Solar, Inc.

Represented By

Plaintiff

Vietnam Sunergy (Bac Ninh) Company Limited

Represented By

Vietnam Sunergy Joint Stock Company

Represented By

VSUN Solar USA Inc.

Represented By

Toyo Solar Texas LLC

Represented By

Toyo Solar Manufacturing One Member Private Limited Company

Represented By

TOPTOYO Investment Pte. Ltd.

Represented By

Toyo Co., Ltd.

Represented By

Court & Judges

Patents Involved

Docket Entries

Proposed Summons. (Yang, Irene) (Filed on 9/23/2026) (Entered: 09/23/2026)

REPORT on the filing or determination of an action regarding a Patent or Trademark (cc: form mailed to register). (Yang, Irene) (Filed on 9/23/2026) (Entered: 09/23/2026)

Summons Issued

Initial Case Management Scheduling Order with ADR Deadlines

~Util - Case Assigned by Intake

Order on Motion for Pro Hac Vice

Consent/Declination to Proceed Before a US Magistrate Judge

Toyo Co., Ltd. v. First Solar, Inc.

Overview

Parties

Defendant

First Solar, Inc. Follow

Represented By

Plaintiff

Vietnam Sunergy (Bac Ninh) Company Limited Follow

Represented By

Vietnam Sunergy Joint Stock Company Follow

Represented By

VSUN Solar USA Inc. Follow

Represented By

Toyo Solar Texas LLC Follow

Represented By

Toyo Solar Manufacturing One Member Private Limited Company Follow

Represented By

TOPTOYO Investment Pte. Ltd. Follow

Represented By

Toyo Co., Ltd. Follow

Represented By

Court & Judges

Patents Involved

Docket Entries

Proposed Summons. (Yang, Irene) (Filed on 9/23/2026) (Entered: 09/23/2026)

REPORT on the filing or determination of an action regarding a Patent or Trademark (cc: form mailed to register). (Yang, Irene) (Filed on 9/23/2026) (Entered: 09/23/2026)

Summons Issued

Initial Case Management Scheduling Order with ADR Deadlines

~Util - Case Assigned by Intake

Order on Motion for Pro Hac Vice

Consent/Declination to Proceed Before a US Magistrate Judge

Track Case Updates

First Solar, Inc.

Vietnam Sunergy (Bac Ninh) Company Limited

Vietnam Sunergy Joint Stock Company

VSUN Solar USA Inc.

Toyo Solar Texas LLC

Toyo Solar Manufacturing One Member Private Limited Company

TOPTOYO Investment Pte. Ltd.

Toyo Co., Ltd.