Bel Fuse Inc. (BELFB)
Nasdaq: BELFB · Electronic Coils, Transformers & Other Inductors · West Orange, NJ · filing with the SEC since 1994
Patents
US patents through Dec 31, 2025 · PatentsView, from the USPTO’s Open Data Portal · read Oct 27, 2026187 patents granted to the 10 names below, as the owner printed on each patent when it was granted. A later sale, a lapse or an expiry is not read, so this is what was granted to Bel Fuse Inc.’s names, not what it holds today.
Patents granted
187
183 utility, 2 design, 2 reissue, 1976 to Dec 31, 2025
Granted in 2025
none
Against none in 2024 and 1 in 2023
Applications published
78
since 2001, to Dec 31, 2025
Names they are printed under
10
a subsidiary, its own name
By yearGrantedApplications published
Each pair is one calendar year. Applications are published about eighteen months after filing, so the newest years read low.
What they are aboutgrants since 2021
Electrical machinery, apparatus, energy3
The main technology area of each patent, in the World Intellectual Property Organization’s 35 fields.
Under which name10 counted
Stratos International, Inc. a subsidiary
US, as the owner printed on each patent
19 published
Stratos Lightwave, Inc. a subsidiary
US, as the owner printed on each patent
7 published
Bel Fuse Inc. its own name
US, as the owner printed on each patent. 6 more under the same name are not counted (printed in CN)
21 published
Trompeter Electronics, Inc. a subsidiary
US, as the owner printed on each patent
8 published
Bel Fuse (Macao Commercial Offshore) Limited a subsidiary
named as the applicant on its applications, in MO
19 published
BEL POWER SOLUTIONS INC. a subsidiary
US, as the owner printed on each patent
0 published
PAI CAPITAL LLC a subsidiary
US, as the owner printed on each patent
0 published
Cinch Connectivity Solutions Inc. a subsidiary
US, as the owner printed on each patent
0 published
Cinch Connectivity Solutions, Inc. a subsidiary
named as the applicant on its applications, in US
3 published
Bel Power (Hangzhou) Co., Ltd. a subsidiary
CN, as the owner printed on each patent
1 published
Names not counted (5)
Cinch Connectors Limited
Most of its patents print US; this name counts in GB. 28 granted and 25 published under it are not counted.
Bel Fuse (Macao Commercial Offshore) Limited
Most of its patents print AF; this name counts in MO. 26 granted and 10 published under it are not counted.
Cinch Connectors Limited
Most of its patents print US; this name counts in GB. 0 granted and 5 published under it are not counted.
TRP International
Most of its patents print US; this name counts in CN. 0 granted and 2 published under it are not counted.
TRP International
Most of its patents print US; this name counts in CN. 2 granted and 0 published under it are not counted.
Newest grantseach row opens the USPTO’s own copy
| Granted | Patent | Title | Field | Owner as printed |
|---|---|---|---|---|
| Jan 24, 2023 | 11,562,854 | Dual slotted bobbin magnetic component with two-legged core | Electrical machinery, apparatus, energy | BEL POWER SOLUTIONS INC. |
| Nov 29, 2022 | 11,515,675 | Electrical cable assembly | Electrical machinery, apparatus, energy | Cinch Connectivity Solutions Inc. |
| Jul 19, 2022 | 11,394,156 | Cable system having shielding layers to reduce and or eliminate EMI leakage | Electrical machinery, apparatus, energy | Cinch Connectivity Solutions Inc. |
| Oct 1, 2019 | 10,429,416 | Power switching device with integrated current sensing transformer | Electrical machinery, apparatus, energy | BEL POWER SOLUTIONS INC. |
| May 7, 2019 | 10,285,311 | High isolation grounding device | Electrical machinery, apparatus, energy | Cinch Connectivity Solutions Inc. |
| Apr 2, 2019 | 10,250,249 | Recuperative gate drive circuit and method | Basic communication processes | BEL POWER SOLUTIONS INC. |
| Mar 26, 2019 | 10,243,310 | Technologies for simultaneous engagement of electrical connectors | Electrical machinery, apparatus, energy | Cinch Connectivity Solutions Inc. |
| Dec 25, 2018 | 10,163,561 | Distributed planar inductor with multi-2D geometry for energy storage | Electrical machinery, apparatus, energy | BEL POWER SOLUTIONS INC. |
| Dec 18, 2018 | 10,158,291 | DC/DC converter for high voltage applications with input voltage boost, input capacitor discharge and output capacitor compensation modes | Electrical machinery, apparatus, energy | BEL POWER SOLUTIONS INC. |
| Nov 13, 2018 | 10,128,639 | High current busbar system for low-profile power shelves | Electrical machinery, apparatus, energy | BEL POWER SOLUTIONS INC. |
Newest applications publishedan application is a clue, never a plan
| Published | Application | Title | Field | Owner as printed |
|---|---|---|---|---|
| Aug 18, 2022 | 2022/0263421 | POWER CONVERTER TRANSFORMER MODULE WITH PCBS CARRYING SECONDARY-SIDE RECTIFIER COMPONENTS | Audio-visual technology | Bel Fuse (Macao Commercial Offshore) Limited · patent 12,063,741 granted from it |
| Mar 12, 2020 | 2020/0083805 | HYBRID DC-DC CONVERTER | Electrical machinery, apparatus, energy | Bel Fuse (Macao Commercial Offshore) Limited · patent 10,756,624 granted from it |
| Nov 28, 2019 | 2019/0362891 | Magnetic Transformer Having Increased Bandwidth for High Speed Data Communications | Electrical machinery, apparatus, energy | Bel Fuse (Macao Commercial Offshore) Limited · patent 11,049,649 granted from it |
| Aug 1, 2019 | 2019/0237920 | MODULAR PLUG CONNECTOR WITH MULTILAYER PCB FOR VERY HIGH SPEED APPLICATIONS | Electrical machinery, apparatus, energy | Bel Fuse (Macao Commercial Offshore) Limited · patent 10,530,106 granted from it |
| May 23, 2019 | 2019/0157808 | MODULAR JACK CONNECTOR | Electrical machinery, apparatus, energy | Bel Fuse (Macao Commercial Offshore) Limited · patent 10,637,196 granted from it |
| Dec 27, 2018 | 2018/0375421 | POWER SUPPLY WITH AUXILIARY CONVERTER FOR EXTENDED INPUT VOLTAGE RANGE | Electrical machinery, apparatus, energy | Bel Fuse (Macao Commercial Offshore) Limited · patent 10,756,632 granted from it |
| Nov 1, 2018 | 2018/0317351 | HIGH ISOLATION GROUNDING DEVICE | Electrical machinery, apparatus, energy | Cinch Connectivity Solutions, Inc. · patent 10,285,311 granted from it |
| Oct 4, 2018 | 2018/0286577 | Magnetic Transformer Having Increased Bandwidth for High Speed Data Communications | Electrical machinery, apparatus, energy | Bel Fuse (Macao Commercial Offshore) Limited · patent 10,504,647 granted from it |
| Aug 30, 2018 | 2018/0248318 | MODULAR JACK CONNECTOR | Electrical machinery, apparatus, energy | Bel Fuse (Macao Commercial Offshore) Limited · patent 10,424,874 granted from it |
| Feb 8, 2018 | 2018/0040987 | MODULAR CONNECTOR PLUG FOR HIGH SPEED DATA TRANSMISSION NETWORKS | Electrical machinery, apparatus, energy | Bel Fuse (Macao Commercial Offshore) Limited · patent 10,439,329 granted from it |
A patent is counted where the owner printed on it when it was granted carries the company’s own name, a former name, the name of a subsidiary its annual report lists, or its own name with a patent-holding phrase (Technology Licensing, Intellectual Property and the like), once the legal form, case and punctuation are set aside, and prints a country that name counts in. PatentsView’s data are published under the Creative Commons Attribution 4.0 licence. Source: PatentsView's granted patents and pre-grant publications, disambiguated, from the USPTO's Open Data Portal, through Dec 31, 2025, read Oct 27, 2026.