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Westlake Corporation (WLK)

NYSE: WLK · Industrial Organic Chemicals · Houston, TX · filing with the SEC since 2003
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Grade5.3
◀ Past 6.7● Present 5.4▶ Future 4.0
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Patents

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

74 patents granted to the 15 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 Westlake Corporation’s names, not what it holds today.

Patents granted
74
58 utility, 14 design, 2 reissue, 1976 to Dec 31, 2025
Granted in 2025
19
Against 11 in 2024 and 10 in 2023
Applications published
63
10 of them in 2025
Names they are printed under
15
a subsidiary, a former name
By yearGrantedApplications published
'10'11'12'13'14'15'16'18'19'20'21'22'23'24'25
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
Macromolecular chemistry, polymers10
Mechanical elements6
Other special machines6
Surface technology, coating4
Civil engineering3
Chemical engineering2
Materials, metallurgy1
Thermal processes and apparatus1
Organic fine chemistry1
The main technology area of each patent, in the World Intellectual Property Organization’s 35 fields.
Under which name15 counted
Westlake Longview Corporation a subsidiary
US, as the owner printed on each patent
27 granted
17 published
Westlake Royal Building Products (USA) Inc. a subsidiary
US, as the owner printed on each patent
25 granted
19 published
Westlake Epoxy Inc. a subsidiary
named as the applicant on its applications, in US
0 granted
10 published
WPT LLC a subsidiary
US, as the owner printed on each patent. 5 more under the same name are not counted (printed in DE)
4 granted
3 published
Westlake Royal Roofing LLC a subsidiary
US, as the owner printed on each patent
4 granted
3 published
Westlake Chemical Corp. a former name
US, as the owner printed on each patent
4 granted
1 published
WESTLAKE EPOXY INC. a subsidiary
US, as the owner printed on each patent
2 granted
1 published
WESTLAKE PIPE &FITTINGS CORPORATION a subsidiary
US, as the owner printed on each patent
3 granted
0 published
Westlake Chemical Corporation a former name
named as the applicant on its applications, in US
0 granted
3 published
Westlake Dimex, LLC a subsidiary
US, as the owner printed on each patent
3 granted
0 published
Westlake Royal Stone, LLC a subsidiary
US, as the owner printed on each patent
2 granted
1 published
Westlake Royal Building Products (USA) Inc. a subsidiary
named as the applicant on its applications, in US
0 granted
2 published
WESTLAKE COMPOUNDS LLC a subsidiary
named as the applicant on its applications, in US
0 granted
1 published
Westlake Longview Corporation a subsidiary
named as the applicant on its applications, in US
0 granted
1 published
Westlake Pipe & Fittings Corporation a subsidiary
named as the applicant on its applications, in US
0 granted
1 published
Names not counted (4)
WPT LLC
Most of its patents print DE; this name counts in US. 0 granted and 8 published under it are not counted.
WPT LLC
Most of its patents print IT; this name counts in US. 2 granted and 0 published under it are not counted.
Westlake Vinnolit GmbH & Co. KG
Most of its patents print DE; this name counts in US. 1 granted and 1 published under it are not counted.
Westlake Vinnolit GmbH & Co. KG
Most of its patents print DE; this name counts in US. 0 granted and 1 published under it are not counted.
Newest grantseach row opens the USPTO’s own copy
GrantedPatentTitleFieldOwner as printed
Dec 30, 202512,509,562Epoxy resin compositions and downhole uses thereofOther special machinesWestlake Chemical Corp.
Dec 23, 2025D1,107,266Siding panelWestlake Royal Building Products (USA) Inc.
Dec 2, 202512,486,354Processes for forming bisphenols, epoxy resin compositionsOrganic fine chemistryWESTLAKE EPOXY INC.
Nov 25, 2025D1,103,419Trim boardWestlake Royal Building Products (USA) Inc.
Oct 28, 202512,454,832Panel for attachment to a mounting surface of a building structure and method of making the sameCivil engineeringWestlake Royal Building Products (USA) Inc.
Oct 14, 2025D1,098,499Trim boardWestlake Royal Building Products (USA) Inc.
Sep 2, 202512,405,016Gable vent assembly with offset lockThermal processes and apparatusWestlake Royal Building Products (USA) Inc.
Sep 2, 202512,403,664Production of floor matsOther special machinesWestlake Dimex, LLC
Aug 26, 202512,397,535Highly-filled polyurethane composites with fiber reinforcementSurface technology, coatingWestlake Royal Building Products (USA) Inc.
Aug 19, 2025D1,089,722Siding panelWestlake Royal Building Products (USA) Inc.
Newest applications publishedan application is a clue, never a plan
PublishedApplicationTitleFieldOwner as printed
Aug 14, 20252025/0257201BLOWN FILM COMPOSITIONS CONTAINING NANOCOMPOSITE AND COMPATIBILIZERMacromolecular chemistry, polymersWestlake Longview Corporation
Aug 14, 20252025/0257200POLYMERIC COMPOSITIONS CONTAINING NANOCOMPOSITE FOR FORMING FILMOther special machinesWestlake Longview Corporation
Aug 14, 20252025/0256447CAST FILMS AND EXTRUSION-COATED SUBSTRATES CONTAINING NANOCOMPOSITE AND COMPATIBILIZEROther special machinesWestlake Longview Corporation
Aug 7, 20252025/0250471EPOXY RESIN COMPOSITIONS AND USES THEREOFMacromolecular chemistry, polymersWestlake Epoxy Inc.
Aug 7, 20252025/0250433EPOXY RESIN COMPOSITIONS AND USES THEREOFMacromolecular chemistry, polymersWestlake Epoxy Inc.
May 8, 20252025/0145555PROCESSES FOR SEPARATING ORGANIC PRODUCTS FROM ORGANIC RECYCLE STREAMSOrganic fine chemistryWESTLAKE EPOXY INC.
Apr 3, 20252025/0109241EPOXY RESIN COMPOSITIONS AND METHODS OF PRODUCING THEREOFMacromolecular chemistry, polymersWestlake Epoxy Inc.
Mar 20, 20252025/0092691RABBET JOINT WITH A CURVED SURFACECivil engineeringWestlake Royal Building Products (USA) Inc.
Mar 6, 20252025/0075042EPOXY RESIN COMPOSITIONS AND USES THEREOFOther special machinesWestlake Epoxy Inc. · patent 12,509,562 granted from it
Jan 9, 20252025/0011522POLYMERIC MATERIALS WITH IMPROVED ENVIRONMENTAL DURABILITYMacromolecular chemistry, polymersWestlake Royal Building Products (USA) Inc.
What it applied for, 2024 to 2025: Macromolecular chemistry, polymers 8 · Other special machines 5 · Organic fine chemistry 2 · Surface technology, coating 1 · Mechanical elements 1 · 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 WLK · research, not advice