Inventor

EWEN JOHN A

US62 patents

⚠️ This page may combine multiple inventors who share the name “EWEN JOHN A”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

EWEN JOHN A

FINA TECHNOLOGY

Process and catalyst for producing isotactic polyolefins

Preparation of metallocene catalysts for polymerization of olefins

Process and catalyst for producing syndiotactic polyolefins

Catalyst for producing hemiisotactic polypropylene

Catalyst systems for producing polyolefins having a broad molecular weight distribution

Catalyst system for the polymerization of olefins

Process and catalyst for producing syndiotactic polyolefins

Hafnium metallocene catalyst for the polymerization of olefins

Syndiotactic polypropylene

Process and catalyst for producing syndiotactic polyolefins

Metallocene catalyst systems

Cationic metallocene catalysts based on organoaluminum anions

Catalyst and process for polymerization of olefins

Catalyst system using aluminum alkyl with ion-pair metallocene catalysts

Metallocene catalysts with lewis acids and aluminum alkyls

Addition of aluminum alkyl for improved metallocene catalyst

Syndiotactic polypropylene

Process for producing syndiotactic polyolefins

Process and catalyst for producing crystalline polyolefins

Process and catalyst for producing syndiotactic polymers

Non-bridged syndiospecific metallocene catalysts and polymerization process

Process for producing stereospecific polymers

Polymerization of olefins with an improved catalyst system using a new electron donor

Alpha olefin polymer products and catalyst systems

Process for producing hemiisotactic polypropylene

Process and catalyst for producing isotactic polyolefins

Process for olefin polymerization using metallocene catalysts with Lewis acids and aluminum alkyls

Polymerization of alpha-olefins with cationic metallocene catalysts based on organoaluminum anions

Process and catalyst for producing crystalline polyolefins

Process and catalyst for producing syndiotactic polymers

Process and catalyst for producing syndiotactic polymers

Process and catalyst for producing syndiotactic polymers

Process and catalyst for producing syndiotactic polymers

Method for controlling the melting points and molecular weights of syndiotactic polyolefins using metallocene catalyst systems

Process for using metallocene catalyst in a continuous reactor system

EXXON RESEARCH ENGINEERING CO

Process and catalyst for producing reactor blend polyolefins

Process and catalyst for producing polyethylene having a broad molecular weight distribution

Process and catalyst for producing polyethylene having a broad molecular weight distribution

Isotactic-stereoblock polymers of alpha-olefins and process for producing the same

EXXON CHEMICAL PATENTS INC

Process and catalyst for polyolefin density and molecular weight control

Catalyst compounds for olefin polymerization

Process and catalyst for polyolefin density and molecular weight control

(unassigned)

Doubly-conformationally locked, stereorigid catalysts for the preparation of tactiospecific polymers

Stereospecific metallocene catalysts with stereolocking α-cp substituents

Process for polymerizing tactioselective polyolefins in condensed phase using titanocenes

BASELL TECHNOLOGY CO BV

Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefins

Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefins

MONTELL TECHNOLOGY COMPANY BV

Stereospecific metallocene catalysts with stereolocking α-CP substituents

COSDEN TECHNOLOGY

Catalyst pretreatment process

BASELL POLYOLEFINE GMBH

Heterocyclic metallocenes and polymerization catalysts