Bartlesville, OK, United States of America

Graham R Lief

This inventor holds 20 USPTO granted patents and 6 published patent applications, plus 2 CIPO patents and 1 EPO patent, primarily in Olefin Polymerization. Top assignee: Chevron Phillips Chemical Company LP. Active years: 2015-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Graham R Lief. Retrieved from https://idiyas.com/inventor/graham-r-lief

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 20 (Patent Applications = 6)

% Patents Active = 95.0

CIPO Patents = 2 (Patent Applications = 6)

EPO Patents = 1 (Patent Applications = 10)

Average Co-Inventor Count = 3.7

ph-index = 2

Forward Citations = 49(Granted Patents)

Company Filing History:

20 out of 1,180

Chevron Phillips Chemical Company LP

patents

Years Active: 2015-2026

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Areas of Expertise:

Sulfated Bentonites

Metallocene Catalysts

Long-Chain Branch Content

Polyethylene Copolymers

Solid Oxide Catalysts

High Melt Flow Polypropylene

Chemical Treatment

Oligomer Production

Polyalphaolefins

Fouling Deterrence

Co-Monomer Selectivity

Suspension Methods

20 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12565543 - Modifications of sulfated bentonites and uses thereof in metallocene catalyst systems for olefin polymerization (2026-03-03),

2. 12351670 - Modifications of sulfated bentonites and uses thereof in metallocene catalyst systems for olefin polymerization (2025-07-08),

3. 12351657 - Controlling long-chain branch content with dual activator-supports (2025-07-08),

4. 12122857 - Controlling long-chain branch content with dual activator-supports (2024-10-22),

5. 12043588 - Solid oxide and chemically-treated solid oxide catalysts for the production of polyalphaolefins (2024-07-23),

6. 11999814 - Modifications of sulfated bentonites and uses thereof in metallocene catalyst systems for olefin polymerization (2024-06-04),

7. 11993667 - Catalyst composition and method for preparing polyethylene (2024-05-28),

8. 11945938 - Bimodal polyethylene copolymers (2024-04-02),

9. 11859041 - Modulating co-monomer selectivity using non-covalent dispersion interactions in group 4 olefin polymerization catalysts (2024-01-02),

10. 11761120 - High melt flow polypropylene homopolymers for fiber applications (2023-09-19),

11. 11667777 - Bimodal polyethylene copolymers (2023-06-06),

12. 11186665 - Catalyst composition and method for preparing polyethylene (2021-11-30),

13. 10927053 - Methods for the preparation and use of suspensions of chemically-treated solid oxides in an olefin-derived liquid medium (2021-02-23),

14. 10883197 - High melt flow polypropylene homopolymers for fiber applications (2021-01-05),

15. 10344106 - Process for reducing the light oligomer content of polypropylene oils (2019-07-09),

Title: Innovator Spotlight - Graham R Lief: Revolutionizing Polyethylene Production

Introduction: Graham R Lief, a prolific inventor based in Bartlesville, OK (US), has made significant contributions to the field of polymer chemistry with his groundbreaking technologies. With an impressive portfolio of 14 patents, Lief's innovative work in the development of catalyst compositions for polyethylene production has significantly impacted the industry.

Latest Patents: Lief's latest patents showcase his expertise in catalyst compositions for polyethylene manufacturing. His invention of metallocene compounds with specific indenyl ligands containing halogenated substituents has led to the production of polyethylene with remarkably low levels of short chain branching. Additionally, his work on bimodal polyethylene copolymers, characterized by distinct HMW and LMW components, has paved the way for advanced polymer designs with unique properties.

Career Highlights: Currently employed at Chevron Phillips Chemical Company LP, Lief continues to drive innovation in polymer science. His tenure at the company has been marked by a series of groundbreaking inventions that have revolutionized the polyethylene industry and enhanced product performance.

Collaborations: Lief's collaborative work with esteemed colleagues such as Eric J Haschke and Qing R Yang has further enriched his research endeavors. By leveraging collective expertise and knowledge, Lief and his coworkers have achieved remarkable breakthroughs in polymer chemistry, setting new standards for sustainable polymer production.

Conclusion: Graham R Lief's unwavering commitment to innovation and excellence in the field of polymer chemistry is truly commendable. His impactful inventions and collaborative spirit exemplify the transformative power of scientific research in shaping the future of polyethylene production. Lief's contributions stand as a testament to the ingenuity and dedication of inventors striving to make a lasting impact on the industry.

Profile summary based on public USPTO records.