Omer Refa Koseoglu

Person

Dhahran, SA

People

Patents Grantslast 30 patents

Information Patent Grant
Platinum nanoparticle functionalized amine-modified fibrous hierarc...
- Patent number 12,221,353
- Issue date Feb 11, 2025
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Platinum organometallic complex functionalized amine-modified fibro...
- Patent number 12,209,024
- Issue date Jan 28, 2025
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Nickel nanoparticle functionalized amine-modified fibrous hierarchi...
- Patent number 12,195,346
- Issue date Jan 14, 2025
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Hydrodearylation reactor
- Patent number 12,161,987
- Issue date Dec 10, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Hierarchically ordered crystalline microporous materials with long-...
- Patent number 12,152,204
- Issue date Nov 26, 2024
- Saudi Arabian Oil Company
- Rajesh Kumar Parsapur
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Amine functionalized zeolites and methods for making such
- Patent number 12,145,854
- Issue date Nov 19, 2024
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Processes for prolonging catalyst activity in a hydroprocessing unit
- Patent number 12,139,675
- Issue date Nov 12, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Grant
Estimating molecular weight of hydrocarbons
- Patent number 12,140,585
- Issue date Nov 12, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Fluid catalytic cracking unit with reactivity based naphtha recycle...
- Patent number 12,134,737
- Issue date Nov 5, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Grant
Slurry-phase catalyst compositions and methods of making
- Patent number 12,109,559
- Issue date Oct 8, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Enhanced hydroprocessing process with ammonia and carbon dioxide re...
- Patent number 12,098,331
- Issue date Sep 24, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Processes and systems for producing fuels and petrochemical feedsto...
- Patent number 12,084,619
- Issue date Sep 10, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Grant
Method for manufacture of a modified ZSM-5 zeolite in the presence...
- Patent number 12,077,445
- Issue date Sep 3, 2024
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Needle coke production from HPNA recovered from hydrocracking unit
- Patent number 12,077,714
- Issue date Sep 3, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Grant
Method of producing plastic pyrolysis products from a mixed plastic...
- Patent number 12,065,617
- Issue date Aug 20, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Modified zeolites that include titanium-containing organometallic m...
- Patent number 12,037,254
- Issue date Jul 16, 2024
- King Abdullah University of Science and Technology
- Robert Peter Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Catalysts with modified active phase dispersion and method to prepa...
- Patent number 12,036,537
- Issue date Jul 16, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Catalysts with modified active phase dispersion and method to prepa...
- Patent number 12,023,656
- Issue date Jul 2, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Nickel nanoparticle functionalized fibrous hierarchical zeolite and...
- Patent number 12,012,425
- Issue date Jun 18, 2024
- King Abdullah University of Science and Technology
- Robert Peter Hodgkins
- B82 - NANO-TECHNOLOGY
Information Patent Grant
Method to remediate contaminated soil
- Patent number 12,005,486
- Issue date Jun 11, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- B09 - DISPOSAL OF SOLID WASTE RECLAMATION OF CONTAMINED SOIL SOIL
Information Patent Grant
Hydrocracking catalyst for hydrocarbon oil including titania binder...
- Patent number 11,998,898
- Issue date Jun 4, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Grant
Reverse isomerization process using feedstock containing dissolved...
- Patent number 11,999,912
- Issue date Jun 4, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Grant
Peptization agent and solid catalyst manufacturing method
- Patent number 11,992,829
- Issue date May 28, 2024
- Saudi Arabian Oil Company
- Guanghui Zhu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Platinum nanoparticle functionalized fibrous hierarchical zeolite a...
- Patent number 11,987,502
- Issue date May 21, 2024
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Modified zeolites that include zirconium-containing organometallic...
- Patent number 11,981,577
- Issue date May 14, 2024
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Method of zeolite synthesis including pH-modified water-soluble oxi...
- Patent number 11,970,403
- Issue date Apr 30, 2024
- Saudi Arabian Oil Company
- Robert P. Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Modified zeolites that include amine-containing organometallic moie...
- Patent number 11,970,402
- Issue date Apr 30, 2024
- King Abdullah University of Science and Technology
- Robert Peter Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Cyclization and fluid catalytic cracking systems and methods for up...
- Patent number 11,965,136
- Issue date Apr 23, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Grant
Methods for reactivity based hydroprocessing
- Patent number 11,965,135
- Issue date Apr 23, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Grant
Method of synthesizing materials integrating supernatant recycle
- Patent number 11,958,751
- Issue date Apr 16, 2024
- Saudi Arabian Oil Company
- Robert P. Hodgkins
- C01 - INORGANIC CHEMISTRY

Patents Applicationslast 30 patents

Information Patent Application
MODIFIED ZEOLITES THAT INCLUDE TITANIUM ATOMS BONDED TO BRIDGING OX...
- Publication number 20250051174
- Publication date Feb 13, 2025
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Application
ESTIMATING MOLECULAR WEIGHT OF HYDROCARBONS
- Publication number 20250003946
- Publication date Jan 2, 2025
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
MODIFIED ZEOLITES THAT INCLUDE TITANIUM HYDRIDE MOIETIES AND METHOD...
- Publication number 20240424486
- Publication date Dec 26, 2024
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
MODIFIED ZEOLITES THAT INCLUDE ZIRCONIUM HYDRIDE MOIETIES AND METHO...
- Publication number 20240424487
- Publication date Dec 26, 2024
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
ZEOLITE BETA PARTICLES WITH CENTER-RADIAL CONFIGURED MESOPORES AND...
- Publication number 20240416330
- Publication date Dec 19, 2024
- Saudi Arabian Oil Company
- Rajesh Kumar PARSAPUR
- C01 - INORGANIC CHEMISTRY
Information Patent Application
METHOD AND SYSTEM FOR LOADING A CATALYST
- Publication number 20240416306
- Publication date Dec 19, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
METHOD AND SYSTEM FOR LOADING A CATALYST
- Publication number 20240416307
- Publication date Dec 19, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
MODIFIED ZEOLITES THAT INCLUDE HAFNIUM HYDRIDE MOIETIES AND METHODS...
- Publication number 20240416333
- Publication date Dec 19, 2024
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
INTEGRATED CATALYST/ADSORBENT MANUFACTURING PROCESS FREE OF CO2 EMI...
- Publication number 20240416334
- Publication date Dec 19, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C01 - INORGANIC CHEMISTRY
Information Patent Application
ENHANCED HYDROPROCESSING PROCESS WITH AMMONIA AND CARBON DIOXIDE RE...
- Publication number 20240400914
- Publication date Dec 5, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
ROTARY EVAPORATOR AND METHOD FOR CATALYST PREPARATION
- Publication number 20240399355
- Publication date Dec 5, 2024
- Saudi Arabian Oil Company
- Guanghui Zhu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
PROCESSES AND SYSTEMS FOR PRODUCING FUELS AND PETROCHEMICAL FEEDSTO...
- Publication number 20240392196
- Publication date Nov 28, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
DISTILLATE HYDROCRACKING PROCESS WITH A REVERSE ISOMERIZATION STEP...
- Publication number 20240383825
- Publication date Nov 21, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Application
NEEDLE COKE PRODUCTION FROM HPNA RECOVERED FROM HYDROCRACKING UNIT
- Publication number 20240384177
- Publication date Nov 21, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Application
PROCESSES FOR PROLONGING CATALYST ACTIVITY IN A HYDROPROCESSING UNIT
- Publication number 20240368486
- Publication date Nov 7, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Application
FLUID CATALYTIC CRACKING UNIT WITH REACTIVITY BASED NAPHTHA RECYCLE...
- Publication number 20240352340
- Publication date Oct 24, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Application
MODIFIED ZEOLITES THAT INCLUDE ZIRCONIUM-CONTAINING ORGANOMETALLIC...
- Publication number 20240286911
- Publication date Aug 29, 2024
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Application
REVERSE ISOMERIZATION PROCESS USING FEEDSTOCK CONTAINING DISSOLVED...
- Publication number 20240287394
- Publication date Aug 29, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Application
CYCLIZATION AND FLUID CATALYTIC CRACKING SYSTEMS AND METHODS FOR UP...
- Publication number 20240263085
- Publication date Aug 8, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Application
METHOD FOR MANUFACTURE OF PURE SILICA ZEOLITES IN THE PRESENCE OF ODSO
- Publication number 20240246829
- Publication date Jul 25, 2024
- Saudi Arabian Oil Company
- Robert Peter HODGKINS
- C01 - INORGANIC CHEMISTRY
Information Patent Application
METHOD FOR MANUFACTURE OF CRYSTALLINE MATERIAL HAVING A CHA FRAMEWO...
- Publication number 20240239671
- Publication date Jul 18, 2024
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Application
METHOD TO SYNTHESIZE CRYSTALLINE MATERIALS IN THE PRESENCE OF ODSO...
- Publication number 20240239670
- Publication date Jul 18, 2024
- Saudi Arabian Oil Company
- Robert Peter HODGKINS
- C01 - INORGANIC CHEMISTRY
Information Patent Application
METHOD TO LOWER STRUCTURE DIRECTING AGENT CONTENT REQUIREMENT FOR M...
- Publication number 20240239672
- Publication date Jul 18, 2024
- Saudi Arabian Oil Company
- Robert Peter HODGKINS
- C01 - INORGANIC CHEMISTRY
Information Patent Application
MODIFIED ZEOLITES THAT INCLUDE AMINE-CONTAINING ORGANOMETALLIC MOIE...
- Publication number 20240228307
- Publication date Jul 11, 2024
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Application
CYCLIZATION AND FLUID CATALYTIC CRACKING SYSTEMS AND METHODS FOR UP...
- Publication number 20240228894
- Publication date Jul 11, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Application
TYPE II HYDROTREATING CATALYST FOR HYDROCARBON OIL AND METHOD FOR H...
- Publication number 20240198319
- Publication date Jun 20, 2024
- Saudi Arabian Oil Company
- Omer Refa KOSEOGLU
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Application
METHOD TO CO-SYNTHESIZE AMORPHOUS AND CRYSTALLINE MATERIALS IN THE...
- Publication number 20240199434
- Publication date Jun 20, 2024
- Saudi Arabian Oil Company
- Robert Peter Hodgkins
- C01 - INORGANIC CHEMISTRY
Information Patent Application
LEACHING AGENT COMPOSITION AND METHOD OF REMOVING METAL FROM CATALY...
- Publication number 20240175105
- Publication date May 30, 2024
- Saudi Arabian Oil Company
- Omer Refa Koseoglu
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Application
HYDROCRACKING CATALYST FOR HYDROCARBON OIL INCLUDING TITANIA BINDER...
- Publication number 20240173704
- Publication date May 30, 2024
- Saudi Arabian Oil Company
- Omer Refa KOSEOGLU
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Application
SYSTEM AND METHOD FOR TESTING OF FLUID CATALYTIC CRACKING CATALYSTS
- Publication number 20240167989
- Publication date May 23, 2024
- Saudi Arabian Oil Company
- Omer Refa KOSEOGLU
- G01 - MEASURING TESTING

Omer Refa Koseoglu

Person

Patents Grantslast 30 patents

Platinum nanoparticle functionalized amine-modified fibrous hierarc...

Platinum organometallic complex functionalized amine-modified fibro...

Nickel nanoparticle functionalized amine-modified fibrous hierarchi...

Hydrodearylation reactor

Hierarchically ordered crystalline microporous materials with long-...

Amine functionalized zeolites and methods for making such

Processes for prolonging catalyst activity in a hydroprocessing unit

Estimating molecular weight of hydrocarbons

Fluid catalytic cracking unit with reactivity based naphtha recycle...

Slurry-phase catalyst compositions and methods of making

Enhanced hydroprocessing process with ammonia and carbon dioxide re...

Processes and systems for producing fuels and petrochemical feedsto...

Method for manufacture of a modified ZSM-5 zeolite in the presence...

Needle coke production from HPNA recovered from hydrocracking unit

Method of producing plastic pyrolysis products from a mixed plastic...

Modified zeolites that include titanium-containing organometallic m...

Catalysts with modified active phase dispersion and method to prepa...

Catalysts with modified active phase dispersion and method to prepa...

Nickel nanoparticle functionalized fibrous hierarchical zeolite and...

Method to remediate contaminated soil

Hydrocracking catalyst for hydrocarbon oil including titania binder...

Reverse isomerization process using feedstock containing dissolved...

Peptization agent and solid catalyst manufacturing method

Platinum nanoparticle functionalized fibrous hierarchical zeolite a...

Modified zeolites that include zirconium-containing organometallic...

Method of zeolite synthesis including pH-modified water-soluble oxi...

Modified zeolites that include amine-containing organometallic moie...

Cyclization and fluid catalytic cracking systems and methods for up...

Methods for reactivity based hydroprocessing

Method of synthesizing materials integrating supernatant recycle

Patents Applicationslast 30 patents

MODIFIED ZEOLITES THAT INCLUDE TITANIUM ATOMS BONDED TO BRIDGING OX...

ESTIMATING MOLECULAR WEIGHT OF HYDROCARBONS

MODIFIED ZEOLITES THAT INCLUDE TITANIUM HYDRIDE MOIETIES AND METHOD...

MODIFIED ZEOLITES THAT INCLUDE ZIRCONIUM HYDRIDE MOIETIES AND METHO...

ZEOLITE BETA PARTICLES WITH CENTER-RADIAL CONFIGURED MESOPORES AND...

METHOD AND SYSTEM FOR LOADING A CATALYST

METHOD AND SYSTEM FOR LOADING A CATALYST

MODIFIED ZEOLITES THAT INCLUDE HAFNIUM HYDRIDE MOIETIES AND METHODS...

INTEGRATED CATALYST/ADSORBENT MANUFACTURING PROCESS FREE OF CO2 EMI...

ENHANCED HYDROPROCESSING PROCESS WITH AMMONIA AND CARBON DIOXIDE RE...

ROTARY EVAPORATOR AND METHOD FOR CATALYST PREPARATION

PROCESSES AND SYSTEMS FOR PRODUCING FUELS AND PETROCHEMICAL FEEDSTO...

DISTILLATE HYDROCRACKING PROCESS WITH A REVERSE ISOMERIZATION STEP...

NEEDLE COKE PRODUCTION FROM HPNA RECOVERED FROM HYDROCRACKING UNIT

PROCESSES FOR PROLONGING CATALYST ACTIVITY IN A HYDROPROCESSING UNIT

FLUID CATALYTIC CRACKING UNIT WITH REACTIVITY BASED NAPHTHA RECYCLE...

MODIFIED ZEOLITES THAT INCLUDE ZIRCONIUM-CONTAINING ORGANOMETALLIC...

REVERSE ISOMERIZATION PROCESS USING FEEDSTOCK CONTAINING DISSOLVED...

CYCLIZATION AND FLUID CATALYTIC CRACKING SYSTEMS AND METHODS FOR UP...

METHOD FOR MANUFACTURE OF PURE SILICA ZEOLITES IN THE PRESENCE OF ODSO

METHOD FOR MANUFACTURE OF CRYSTALLINE MATERIAL HAVING A CHA FRAMEWO...

METHOD TO SYNTHESIZE CRYSTALLINE MATERIALS IN THE PRESENCE OF ODSO...

METHOD TO LOWER STRUCTURE DIRECTING AGENT CONTENT REQUIREMENT FOR M...

MODIFIED ZEOLITES THAT INCLUDE AMINE-CONTAINING ORGANOMETALLIC MOIE...

CYCLIZATION AND FLUID CATALYTIC CRACKING SYSTEMS AND METHODS FOR UP...

TYPE II HYDROTREATING CATALYST FOR HYDROCARBON OIL AND METHOD FOR H...

METHOD TO CO-SYNTHESIZE AMORPHOUS AND CRYSTALLINE MATERIALS IN THE...

LEACHING AGENT COMPOSITION AND METHOD OF REMOVING METAL FROM CATALY...

HYDROCRACKING CATALYST FOR HYDROCARBON OIL INCLUDING TITANIA BINDER...

SYSTEM AND METHOD FOR TESTING OF FLUID CATALYTIC CRACKING CATALYSTS