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Clean Harbors, Inc (CLH)

NYSE: CLH · Hazardous Waste Management · Norwell, MA · filing with the SEC since 1994
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Patents

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

68 patents granted to the 11 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 Clean Harbors, Inc’s names, not what it holds today.

Patents granted
68
62 utility, 6 design, 1976 to Dec 31, 2025
Granted in 2025
none
Against 1 in 2024 and none in 2023
Applications published
31
since 2001, to Dec 31, 2025
Names they are printed under
11
a subsidiary, its own name
By yearGrantedApplications published
'07'08'09'10'11'12'13'14'15'16'18'19'20'23'24
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
Chemical engineering1
The main technology area of each patent, in the World Intellectual Property Organization’s 35 fields.
Under which name11 counted
Safety-Kleen Systems, Inc. a subsidiary
US, as the owner printed on each patent
28 granted
17 published
SAFETY KLEEN CORPORATION a subsidiary
US, as the owner printed on each patent
31 granted
1 published
Clean Harbors Environmental Services, Inc. a subsidiary
US, as the owner printed on each patent
2 granted
3 published
Clean Harbors, Inc. its own name
US, as the owner printed on each patent
3 granted
0 published
Emergency Response and Training Solutions, Inc a subsidiary
US, as the owner printed on each patent
1 granted
2 published
PSC Industrial Outsourcing, LP a subsidiary
US, as the owner printed on each patent
1 granted
2 published
Thompson Industrial Services, LLC a subsidiary
named as the applicant on its applications, in US
0 granted
3 published
Thompson Industrial Services, LLC. a subsidiary
US, as the owner printed on each patent
2 granted
0 published
Environmental Management Alternatives, Inc a subsidiary
named as the applicant on its applications, in US
0 granted
1 published
Noble Oil Services, Inc. a subsidiary
named as the applicant on its applications, in US
0 granted
1 published
PSC Industrial Outsourcing, LP a subsidiary
named as the applicant on its applications, in US
0 granted
1 published
Names not counted (3)
NTS, LLC
Most of its patents print KR; this name counts in US. 5 granted and 2 published under it are not counted.
NTS, LLC
Most of its patents print KR; this name counts in US. 0 granted and 2 published under it are not counted.
Clean Harbors Energy and Industrial Services Corp.
Most of its patents print US; this name counts in CA. 1 granted and 0 published under it are not counted.
Newest grantseach row opens the USPTO’s own copy
GrantedPatentTitleFieldOwner as printed
May 14, 202411,980,918Hydroblasting systemChemical engineeringThompson Industrial Services, LLC.
Jul 14, 202010,710,095Apparatus and method to render air bag inflators and other low level detonatable devices inert for recyclingChemical engineeringClean Harbors Environmental Services, Inc.
Jun 25, 201910,330,452Apparatus and method to render air bag inflators and other low level detonatable devices inert for recyclingChemical engineeringClean Harbors Environmental Services, Inc.
Mar 10, 20158,977,563System and method for electronic time reconciliationIT methods for managementPSC Industrial Outsourcing, LP
Oct 22, 20138,566,136Method for the secure logging of correspondence and notification thereofIT methods for managementEmergency Response and Training Solutions, Inc
Aug 13, 20138,506,761Recycler module for a recycler assemblyChemical engineeringSafety-Kleen Systems, Inc.
Jun 25, 20138,470,138Odor mitigation in a recycler assemblyChemical engineeringSafety-Kleen Systems, Inc.
Jun 25, 20138,470,137Recycler assemblyChemical engineeringSafety-Kleen Systems, Inc.
Jun 25, 20138,470,136Parts washer with recycler assemblyChemical engineeringSafety-Kleen Systems, Inc.
Apr 23, 20138,425,732Method of operation for a recycler assemblyChemical engineeringSafety-Kleen Systems, Inc.
Newest applications publishedan application is a clue, never a plan
PublishedApplicationTitleFieldOwner as printed
Oct 3, 20242024/0327747Composition and Method of Use of a Concentrated Asphaltene Polymer Residue from VTAEBasic materials chemistrySafety-Kleen Systems, Inc.
May 4, 20232023/0134470Shotgun Hydroblasting SystemOther special machinesThompson Industrial Services, LLC
Feb 16, 20232023/0051640Hydroblasting SystemChemical engineeringThompson Industrial Services, LLC · patent 11,980,918 granted from it
Jul 11, 20192019/0210035Apparatus and Method to Render Air Bag Inflators and Other Low Level Detonatable Devices Inert for RecyclingChemical engineeringClean Harbors Environmental Services, Inc. · patent 10,710,095 granted from it
Jan 17, 20192019/0017796Apparatus and Method to Render Air Bag Inflators and Other Low Level Detonatable Devices Inert for RecyclingChemical engineeringClean Harbors Environmental Services, Inc. · patent 10,330,452 granted from it
Feb 22, 20182018/0050279Methods for Treating Used Oil Vacuum Tower BottomsChemical engineeringNoble Oil Services, Inc.
Nov 10, 20162016/0325319IN-SITUATION SCR CATALYST CLEANING PROCESSChemical engineeringThompson Industrial Services, LLC
Jun 25, 20152015/0175451Systems and Methods for Waste Oil RecoveryEnvironmental technologyEnvironmental Management Alternatives, Inc · patent 9,815,711 granted from it
May 21, 20152015/0142625SYSTEM AND METHOD FOR ELECTRONIC TIME RECONCILIATIONIT methods for managementPSC Industrial Outsourcing, LP
Nov 13, 20142014/0332094PARTS WASHER ASSEMBLY WITH EXTERNALLY MOUNTED PUMP MOTORChemical engineeringSafety-Kleen Systems, Inc.
What it applied for, 2024 to 2025: Basic materials chemistry 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 CLH · research, not advice