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Littelfuse, Inc. (LFUS)

Nasdaq: LFUS · Switchgear & Switchboard Apparatus · Rosemont, IL · filing with the SEC since 1996
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Grade4.9
◀ Past 4.7● Present 5.0▶ Future 4.9
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Patents

US patents through Dec 31, 2025 · PatentsView, from the USPTO’s Open Data Portal · read Oct 27, 2026

1,235 patents granted to the 31 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 Littelfuse, Inc.’s names, not what it holds today.

Patents granted
1,235
1,205 utility, 29 design, 1 reissue, 1976 to Dec 31, 2025
Granted in 2025
25
Against 34 in 2024 and 55 in 2023
Applications published
765
45 of them in 2025
Names they are printed under
31
its own name, a subsidiary
By yearGrantedApplications published
'11'12'13'14'15'16'17'18'19'20'21'22'23'24'25
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, energy147
Semiconductors30
Measurement16
Basic communication processes7
Transport3
Macromolecular chemistry, polymers2
Audio-visual technology1
Mechanical elements1
Chemical engineering1
The main technology area of each patent, in the World Intellectual Property Organization’s 35 fields.
Under which name31 counted
Littelfuse, Inc. its own name
US, as the owner printed on each patent
541 granted
386 published
IXYS, LLC a subsidiary
US, as the owner printed on each patent
197 granted
87 published
Zilog, Inc. a subsidiary
US, as the owner printed on each patent
241 granted
28 published
Carling Technologies, Inc. a subsidiary
US, as the owner printed on each patent. 1 more under the same name are not counted (printed in FR)
81 granted
14 published
IXYS Corporation a subsidiary
named as the applicant on its applications, in US. 1 more under the same name are not counted (printed in DE)
0 granted
55 published
Littelfuse Semiconductor (Wuxi) Co., Ltd. a subsidiary
CN, as the owner printed on each patent
11 granted
38 published
Dongguan Littelfuse Electronics Company Limited a subsidiary
CN, as the owner printed on each patent
15 granted
27 published
Suzhou Littelfuse OVS Co., Ltd. a subsidiary
CN, as the owner printed on each patent
17 granted
24 published
Basler Electric Company a subsidiary
US, as the owner printed on each patent
31 granted
3 published
C&K COMPONENTS S.A.S. a subsidiary
FR, as the owner printed on each patent
20 granted
5 published
Monolith Semiconductor, Inc. a subsidiary
US, as the owner printed on each patent. 3 more under the same name are not counted (printed in TW)
19 granted
6 published
C & K Components, Inc. a subsidiary
US, as the owner printed on each patent
22 granted
0 published
Littelfuse, Japan G.K. a subsidiary
JP, as the owner printed on each patent
13 granted
8 published
C&K COMPONENTS S.A.S. a subsidiary
named as the applicant on its applications, in FR
0 granted
17 published
Littelfuse, Inc. its own name
named as the applicant on its applications, in US
0 granted
16 published
IXYS Semiconductor GmbH a subsidiary
DE, as the owner printed on each patent
8 granted
7 published
Monolith Semiconductor Inc. a subsidiary
named as the applicant on its applications, in US
0 granted
13 published
Carling Technologies, Inc. a subsidiary
named as the applicant on its applications, in US
0 granted
8 published
IXYS Intl Limited a subsidiary
KY, as the owner printed on each patent
7 granted
0 published
Littelfuse Electronics (Shanghai) Co., Ltd. a subsidiary
CN, as the owner printed on each patent
5 granted
2 published
BASLER ELECTRIC COMPANY a subsidiary
named as the applicant on its applications, in US
0 granted
5 published
Hartland Controls, LLC a subsidiary
US, as the owner printed on each patent
2 granted
2 published
LITTELFUSE FRANCE SAS a subsidiary
FR, as the owner printed on each patent
3 granted
1 published
RADIOPULSE INC. a subsidiary
KR, as the owner printed on each patent
1 granted
3 published
Dongguan Littelfuse Electronics Company Limited a subsidiary
named as the applicant on its applications, in CN
0 granted
2 published
IXYS Semiconductor GmbH a subsidiary
named as the applicant on its applications, in DE
0 granted
2 published
Littelfuse Semiconductor (Wuxi) Co., Ltd. a subsidiary
named as the applicant on its applications, in CN
0 granted
2 published
Symcom, Inc. a subsidiary
US, as the owner printed on each patent
0 granted
2 published
LITTELFUSE INTERNATIONAL HOLDING, LLC. a subsidiary
US, as the owner printed on each patent
1 granted
0 published
Littelfuse Electronics (Shanghai) Co., Ltd. a subsidiary
named as the applicant on its applications, in CN
0 granted
1 published
Littelfuse Europe GmbH a subsidiary
DE, as the owner printed on each patent
0 granted
1 published
Names not counted (3)
Embed Limited
Most of its patents print US; this name counts in GB. 1 granted and 1 published under it are not counted.
E.I.S. Electronics GmbH
Only generic words.
E.I.S. International GmbH
Only generic words.
Newest grantseach row opens the USPTO’s own copy
GrantedPatentTitleFieldOwner as printed
Dec 30, 202512,512,667Asymmetric bidirectional surge protection deviceElectrical machinery, apparatus, energyLittelfuse Semiconductor (Wuxi) Co., Ltd.
Dec 16, 202512,500,151Solderless and pressure contact connectionSemiconductorsLittelfuse, Inc.
Dec 16, 202512,500,057Unsealed single fuse holderElectrical machinery, apparatus, energyLittelfuse, Inc.
Dec 2, 202512,489,303CDOT device for wireless chargingElectrical machinery, apparatus, energyLittelfuse, Inc.
Nov 18, 202512,476,063Spacing bracket for circuit breaker mounted to circuit boardElectrical machinery, apparatus, energyCarling Technologies, Inc.
Nov 4, 202512,462,957Thermal protection device to withstand high voltageElectrical machinery, apparatus, energyLittelfuse, Inc.
Oct 28, 202512,456,856Overcurrent protection of power semiconductor packages using integrated positive temperature indicatorElectrical machinery, apparatus, energyLittelfuse, Inc.
Oct 28, 202512,456,674Leadframeless electrically isolated power semiconductor packageSemiconductorsLittelfuse, Inc.
Oct 21, 202512,451,383Corner relief undercut to reduce die damageSemiconductorsLittelfuse, Inc.
Oct 7, 202512,438,343Modular power distribution unitElectrical machinery, apparatus, energyLittelfuse, Inc.
Newest applications publishedan application is a clue, never a plan
PublishedApplicationTitleFieldOwner as printed
Dec 18, 20252025/0385236DISCRETE SEMICONDUCTOR DEVICE PACKAGE WITH INTEGRATED TEMPERATURE SENSORSemiconductorsLittelfuse Semiconductor (Wuxi) Co., Ltd.
Dec 18, 20252025/0383411DIRECTED ACTIVATION REED SENSORElectrical machinery, apparatus, energyDongguan Littelfuse Electronics Company Limited
Dec 4, 20252025/0372332MOLDED FILLER PAD FOR FUSE DEVICESElectrical machinery, apparatus, energyLittelfuse, Inc.
Nov 27, 20252025/0364161HIGH SOLDERING STRENGTH TERMINAL FOR SURGE PROTECTION DEVICEElectrical machinery, apparatus, energyDongguan Littelfuse Electronics Company Limited
Nov 20, 20252025/0357267DIRECT LIQUID COOLING OF SEMICONDUCTOR DEVICESSemiconductorsLittelfuse, Inc.
Nov 20, 20252025/0357265DIRECT LIQUID COOLING OF SEMICONDUCTOR DEVICESSemiconductorsLittelfuse, Inc.
Nov 13, 20252025/0347535POSITIONAL DETECTION DEVICE WITH MAGNETIC SENSING TECHNOLOGYMeasurementC&K COMPONENTS S.A.S.
Nov 6, 20252025/0340714THERMAL STABLE PPTC MATERIAL AND MANUFACTURING METHOD THEREOFElectrical machinery, apparatus, energyDongguan Littelfuse Electronics Company Limited
Oct 30, 20252025/0338409Vent Seal for Extreme Environment ApplicationsAudio-visual technologySuzhou Littelfuse OVS Co., Ltd.
Oct 30, 20252025/0336576THREE-DIMENSIONAL ELECTRODES FOR REFLOWABLE PTC DEVICEElectrical machinery, apparatus, energyLittelfuse, Inc.
What it applied for, 2024 to 2025: Electrical machinery, apparatus, energy 55 · Semiconductors 39 · Measurement 5 · Audio-visual technology 3 · Chemical engineering 1 · Materials, metallurgy 1.

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.

SI Assistanton LFUS · research, not advice