Patents by Inventor Kevin Stevens

Kevin Stevens has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220056168
    Abstract: The present disclosure provides processes for polymerizing olefin(s). Methods can include combining a catalyst component slurry with a catalyst component solution to form a third catalyst composition and introducing the third composition into a polymerization reactor. The present disclosure further provides methods for preparing catalyst component slurries, catalyst component solutions, and the third catalyst compositions. In at least one embodiment, a method includes contacting a first composition and a second composition in a line to form a third composition, the first composition including a contact product of a first catalyst, a second catalyst, a support, an activator, a mineral oil, and a wax, and the second composition comprising a contact product of an activator, a diluent, and the first catalyst or second catalyst.
    Type: Application
    Filed: October 30, 2019
    Publication date: February 24, 2022
    Inventors: Joshua P. Olson, Chi-l Kuo, Charles J. Harlan, Kevin A. Stevens, Justin A. Federici
  • Publication number: 20220048016
    Abstract: This invention relates to a supported catalyst system comprising: (i) at least one first catalyst component comprising a group 4 bis(phenolate) complex; (ii) at least one second catalyst component comprising a 2,6-bis(imino)pyridyl iron complex; (iii) activator; and (iv) support. The catalyst system may be used for preparing polyolefins, such a bimodal polyethylene, typically in a gas phase polymerization.
    Type: Application
    Filed: February 2, 2021
    Publication date: February 17, 2022
    Inventors: Matthew W. Holtcamp, Dongming Li, Kevin A. Stevens, Jo Ann M. Canich, John R. Hagadorn, Ramyaa Mathialagan, Timothy M. Boller
  • Publication number: 20220033537
    Abstract: In an embodiment, a method for producing a polyolefin includes contacting a first composition and a second composition in in a line to form a third composition, wherein: the first composition comprises a contact product of a first catalyst, a second catalyst, a support, a first activator, and a diluent, wherein the mol ratio of second catalyst to first catalyst is from 60:40 to 40:60, the second composition comprises a contact product of the third catalyst, a second activator, and a second diluent, and the third composition comprises a mol ratio of the third catalyst to the second catalyst to the first catalyst of from 10:35:55 to 60:15:25, such as 30:20:30; introducing the third composition from the line into a gas-phase fluidized bed reactor; exposing the third composition to polymerization conditions; and obtaining a polyolefin.
    Type: Application
    Filed: October 30, 2019
    Publication date: February 3, 2022
    Inventors: Kevin A. Stevens, David F. Sanders, Matthew W. Holtcamp, Charles J. Harlan, Xuan Ye, Adriana S. Silva, Matthew S. Bedoya, Joshua P. Olson
  • Publication number: 20220033536
    Abstract: In an embodiment, a method for producing a polyolefin is provided. The method includes: contacting a first composition and a second composition in a line to form a third composition, wherein: the first composition comprises a contact product of a first catalyst, a second catalyst, a support, and a diluent, wherein the mol ratio of second catalyst to first catalyst is from 60:40 to 40:60, the second composition comprises a contact product of the second catalyst and a second diluent; introducing the third composition from the line into a gas-phase fluidized bed reactor; exposing the third composition to polymerization conditions; and obtaining a polyolefin.
    Type: Application
    Filed: October 30, 2019
    Publication date: February 3, 2022
    Inventors: Kevin A. Stevens, David F. Sanders, Matthew W. Holtcamp, Charles J. Harlan, Xuan Ye, Adriana S. Silva, Matthew S. Bedoya, Joshua P. Olson
  • Publication number: 20220033535
    Abstract: The present disclosure provides processes for polymerizing olefin(s). In at least one embodiment, a method for producing a polyolefin is provided. The method includes contacting a first composition and a second composition in a line to form a third composition. The first composition includes a contact product of a first catalyst, a second catalyst, a support, a first activator, and a diluent, and the mol ratio of first catalyst to second catalyst is from 90:10 to 40:60. The second composition includes a contact product of the second catalyst, a second activator, and a second diluent. The third composition includes a mol ratio of first catalyst to second catalyst of from 89:11 to 10:90. The method includes introducing the third composition from the line into a gas-phase fluidized bed reactor, exposing the third composition to polymerization conditions, and obtaining a polyolefin.
    Type: Application
    Filed: October 30, 2019
    Publication date: February 3, 2022
    Inventors: Kevin A. Stevens, David F. Sanders, Matthew W. Holtcamp, Charles J. Harlan, Xuan Ye, Adriana S. Silva, Matthew S. Bedoya, Joshua P. Olson
  • Publication number: 20210395404
    Abstract: A process for polymerizing polyethylene is disclosed. The process comprises contacting ethylene and at least one comonomer with a catalyst system to produce a polyolefin. The first catalyst and at least a portion of the second catalyst are co-supported to form a commonly-supported catalyst system. The catalyst system is introduced to a line as a dry-feed. The line is coupled with a polymerization reactor. A carrier fluid is added to the line to form a slurry. The slurry is introduced to the polymerization reactor.
    Type: Application
    Filed: October 30, 2019
    Publication date: December 23, 2021
    Inventors: David F. Sanders, Matthew W. Holtcamp, Kevin A. Stevens, Joshua P. Olson
  • Patent number: 11198747
    Abstract: The present disclosure relates to dual catalyst systems and processes for use thereof. The present disclosure further provides a catalyst system that is a combination of at least two hafnium metallocene catalyst compounds. The catalyst systems may be used for olefin polymerization processes. The present disclosure further provides for polymers, which can be formed by processes and catalyst systems of the present disclosure.
    Type: Grant
    Filed: May 29, 2019
    Date of Patent: December 14, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Matthew W. Holtcamp, Laughlin G. McCullough, Kevin A. Stevens, Subramaniam Kuppuswamy, Matthew S. Bedoya
  • Patent number: 11186601
    Abstract: This invention relates to metallocene compounds represented by the formula: catalyst systems comprising said metallocene compound and an activator or a reaction product of the metallocene compound with the at least one activator, and polymerization processes using such metallocene compounds and activators, where Cpa and Cpb are optionally-substituted cyclopentadienyl rings; A is bridging group; q is zero or 1; Q is O, O(CR3R4)m, (CR3R4)mO, or (CR3R4)m; m is 0 to 18; Z is (CR3R4)2; LA is a Lewis acid; M is a transition metal; X1 and X2 are independently R5 or OR5; R1 and R2 are independently selected from optionally-substituted hydrocarbyl groups; R3 and R4 are independently selected from the group consisting of H, halogen, and an optionally-substituted hydrocarbyl group; and R5 is alkyl, aryl, perfluoroalkyl, or perfluoroaryl.
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: November 30, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Matthew W. Holtcamp, Charles J. Harlan, Subramaniam Kuppuswamy, Matthew S. Bedoya, Kevin A. Stevens
  • Patent number: 11130827
    Abstract: This invention relates to a polyethylene composition, and films therefrom, comprising at least 65 wt % ethylene derived units and from 0.1 to 35 wt % of C3-C12 olefin comonomer derived units, where the polyethylene composition has: a) an RCI,m of less than 85 kg/mol; b) a Tw1?Tw2 value of from ?15 to ?40° C.; and c) an Mw1/Mw2 value of less than 1.5 where the film has a) a heat seal initiation temperature of X ° C. or less at 5 N of force, where X=0.0015×Y(psi)+62.6 (where Y is the average 1% Secant modulus ((MD+TD)/2)) of the film; b) a dart drop impact of 300 g/mil or more; c) an MD Elmendorf tear of 230 g or more; and d) average 1% Secant modulus ((MD+TD)/2) of 20,000 psi or more.
    Type: Grant
    Filed: May 13, 2019
    Date of Patent: September 28, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Dongming Li, Jian Yang, Kevin A. Stevens, Yan Jiang, Gregory J. Smith-Karahalis
  • Patent number: 11051972
    Abstract: The present disclosure relates to a non-invasive, non-gravitationally dependent, pressurized method for the rapid selective extraction, volume expansion, and reclamation of medication and medication metabolites (including but not limited to naturally occurring or engineered hormones, chemicals, antibodies, enzymes, lipids, proteins or pharmaceutical products) from urine. The disclosure further relates to methods for reclamation of medication from urine in a pressurized system and methods of using the medication reclaimed from that urine.
    Type: Grant
    Filed: December 10, 2020
    Date of Patent: July 6, 2021
    Inventor: Kevin-Steven Creagh Buford
  • Patent number: 11046796
    Abstract: The present disclosure provides films made of polyethylene (PE) compositions. In at least one embodiment, a film includes a polyethylene composition, comprising: ethylene content and from 0 to 25 mol % of C3-C40 olefin comonomer content, based upon the total weight of the polyethylene composition, the polyethylene composition having a total internal plus terminal unsaturation greater than 0.7 unsaturations per 1000 carbon atoms, the film having: an Elmendorf Tear value in the machine direction of from 10 g/mil to 300 g/mil, and a Dart Drop Impact of from 100 g/mil to 800 g/mil. In at least one embodiment, the present disclosure provides for processes to make a film.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: June 29, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Dongming Li, David M. Fiscus, Kevin A. Stevens, Ching-Tai Lue, Matthew W. Holtcamp
  • Patent number: 11014025
    Abstract: The present disclosure relates to a system for the selective extraction and recycling of medication from body fluid, using a pressurized filtration system and device. The disclosure further relates to methods for extracting and/or recycling medication from body fluid in a pressurized system and methods of using the medication collected/extracted from that body fluid.
    Type: Grant
    Filed: March 25, 2020
    Date of Patent: May 25, 2021
    Inventor: Kevin-Steven Creagh Buford
  • Publication number: 20210079137
    Abstract: A metallocene catalyst compound can comprise a structure represented by formula (F-MC) below comprising a first cyclopentadienyl ring with carbon atoms directly connected with R1, R2, R4, and R5, and a second cyclopentadienyl ring with carbon atoms directly connected with R10, R11, R12, and R13, and a bridging group (BG) directly connecting the first and second cyclopentadienyl rings A catalyst system can include the metallocene compound, a non-coordinating anion type activator comprising a supported alumoxane or aluminum alkyl, and optionally a scavenger. A process for making a polymeric product can comprise: contacting a C2-C22 alpha-olefin feed with the catalyst system to obtain a polymerization reaction mixture; and obtaining a polymer product from the polymerization reaction mixture. A polymer product can be made by the process to exhibit at least an Mn from 7,000 g/mol to 70,000 g/mol and a PDI from 4.1 to 9.0.
    Type: Application
    Filed: November 5, 2020
    Publication date: March 18, 2021
    Inventors: Matthew W. Holtcamp, Subramaniam Kuppuswamy, Matthew S. Bedoya, Kevin A. Stevens
  • Publication number: 20210054111
    Abstract: A mixed metallocene catalyst system can comprise at least one metallocene catalyst compound comprising a structure represented by formula (A) below and optionally at least one other metallocene catalyst compound having a structure represented by formula (B) below: A mixed metallocene catalyst system can additionally include a non-coordinating anion type activator comprising a supported alumoxane or aluminum alkyl, and optionally a scavenger. A process for making a polymeric product can comprise: contacting a C2-C22 alpha-olefin feed with the catalyst system to obtain a polymerization reaction mixture; and obtaining a polymer product from the polymerization reaction mixture. A polymer product can be made by the process.
    Type: Application
    Filed: November 5, 2020
    Publication date: February 25, 2021
    Inventors: Matthew W. Holtcamp, Subramaniam Kuppuswamy, Matthew S. Bedoya, Kevin A. Stevens, Ching-Tai Lue, Hasnain Rangwalla
  • Patent number: 10927205
    Abstract: The present disclosure provides processes for polymerizing olefin(s). Methods can include contacting a first composition and a second composition in a line to form a third composition. The first composition can include a contact product of a first catalyst, a second catalyst, a support, a first activator, a mineral oil. The second composition can include a contact product of an activator, a diluent, and the first catalyst or the second catalyst. Methods can include introducing the third composition from the line into a gas-phase fluidized bed reactor, introducing a condensing agent to the line and/or the reactor, exposing the third composition to polymerization conditions, and/or obtaining a polyolefin. Polyethylene compositions including at least 65 wt % ethylene derived units, based upon the total weight of the polyethylene composition, are provided.
    Type: Grant
    Filed: February 27, 2019
    Date of Patent: February 23, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Kevin A. Stevens, Wen Li
  • Patent number: 10926250
    Abstract: A catalyst system including the product of the combination of an unbridged Group 4 metallocene compound and a 2,6-bis(imino)pyridyl iron complex is provided. A process for the polymerization of monomers (such as olefin monomers) and a polymer produced therefrom are also provided.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: February 23, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Matthew W. Holtcamp, Kevin A. Stevens, Laughlin G. McCullough, David F. Sanders, Subramaniam Kuppuswamy, Matthew S. Bedoya
  • Publication number: 20210023540
    Abstract: A catalyst system including the product of the combination of an unbridged Group 4 metallocene compound and a 2,6-bis(imino)pyridyl iron complex is provided. A process for the polymerization of monomers (such as olefin monomers) and a polymer produced therefrom are also provided.
    Type: Application
    Filed: October 15, 2020
    Publication date: January 28, 2021
    Inventors: Matthew W. Holtcamp, Kevin A. Stevens, Laughlin G. McCullough, David F. Sanders, Subramaniam Kuppuswamy, Matthew S. Bedoya
  • Patent number: 10899860
    Abstract: The present disclosure provides processes for polymerizing olefin(s). Methods can include contacting a first composition and a second composition in a line to form a third composition. The first composition can include a contact product of a first catalyst, a second catalyst, a support, a first activator, a mineral oil. The second composition can include a contact product of an activator, a diluent, and the first catalyst or the second catalyst. Methods can include introducing the third composition from the line into a gas-phase fluidized bed reactor, introducing a condensing agent to the line and/or the reactor, exposing the third composition to polymerization conditions, and/or obtaining a polyolefin. Polyethylene compositions including at least 65 wt % ethylene derived units, based upon the total weight of the polyethylene composition, are provided.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: January 26, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Adriana S. Silva, Matthew W. Holtcamp, Ryan W. Impelman, Richard E. Pequeno, Kevin A. Stevens, Charles J. Harlan, Xuan Ye
  • Patent number: D911553
    Type: Grant
    Filed: August 6, 2018
    Date of Patent: February 23, 2021
    Inventors: Jeffrey J. Konczak, Kevin Stevens
  • Patent number: D937437
    Type: Grant
    Filed: January 26, 2021
    Date of Patent: November 30, 2021
    Inventors: Jeffrey J. Konczak, Kevin Stevens