Patents by Inventor Kevin A. Stevens

Kevin A. 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).

  • 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: 10865258
    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: Grant
    Filed: January 17, 2019
    Date of Patent: December 15, 2020
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Matthew W. Holtcamp, Subramaniam Kuppuswamy, Matthew S. Bedoya, Kevin A. Stevens, Ching-Tai Lue, Hasnain Rangwalla
  • Patent number: 10851187
    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 7000 g/mol to 70000 g/mol and a PDI from 4.1 to 9.0.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: December 1, 2020
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Matthew W. Holtcamp, Subramaniam Kuppuswamy, Matthew S. Bedoya, Kevin A. Stevens
  • Publication number: 20200238014
    Abstract: An injection system includes a handle assembly with a handle body having an outer surface surrounding a handle body interior and a plunger extending therethrough. A tubular handle collar is telescopically received in the handle body exterior and is axially movable with respect to the handle body. A syringe housing assembly is selectively connectable to the handle assembly and includes a syringe housing and a tubular syringe sleeve telescopically received through a distal end of the syringe housing and axially movable with respect thereto. The syringe housing has an exterior side surface surrounding a syringe housing interior configured to receive at least a portion of a syringe. The syringe sleeve has a proximal end, a distal end with a skin contact surface, and a generally cylindrically-shaped outer surface.
    Type: Application
    Filed: October 22, 2018
    Publication date: July 30, 2020
    Applicant: West Pharmaceutical Services, Inc.
    Inventors: Kevin STEVENS, Ian SCRIMGEOUR, Scott SALTER, Andrew BLAIR, Alan KITCHING, David SHEPERD
  • Publication number: 20200165366
    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: Application
    Filed: June 29, 2018
    Publication date: May 28, 2020
    Inventors: Dongming Li, David M. Fiscus, Kevin A. Stevens, Ching-Tai Lue, Matthew W. Holtcamp
  • Publication number: 20200071437
    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: Application
    Filed: February 27, 2019
    Publication date: March 5, 2020
    Inventors: Kevin A. Stevens, Wen Li
  • Publication number: 20200071349
    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: Application
    Filed: August 27, 2019
    Publication date: March 5, 2020
    Inventors: Matthew W. Holtcamp, Charles J. Harlan, Subramaniam Kuppuswamy, Matthew S. Bedoya, Kevin A. Stevens
  • Publication number: 20200071436
    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: Application
    Filed: November 29, 2018
    Publication date: March 5, 2020
    Inventors: Adriana S. Silva, Matthew W. Holtcamp, Ryan W. Impelman, Richard E. Pequeno, Kevin A. Stevens, Charles J. Harlan, Xuan Ye
  • Publication number: 20190389988
    Abstract: Methods to produce heterogeneous polyethylene granules, the method including: contacting first olefin monomers and second olefin monomers with a catalyst system in a single reaction zone to produce heterogeneous polyethylene granules and recovering the heterogeneous polyethylene granules; wherein the catalyst system includes a product of a combination including: one or more catalysts having a Group 3 through Group 12 metal atom or lanthanide metal atom; at least one activator; and optionally, one or more support material compositions; and wherein the heterogeneous polyethylene granules include a product of a combination of: a first portion comprising a first polyethylene including the first olefin monomers and the second olefin monomers; a second portion including a second polyethylene including the first monomers and the second monomers; and wherein the first polyethylene has a higher second monomer weight percent than the second polyethylene, are provided.
    Type: Application
    Filed: June 21, 2019
    Publication date: December 26, 2019
    Inventors: Xuan Ye, Jonathan J. Schaefer, Timothy M. Boller, Christopher S. Breiner, Chi-I Kuo, Kevin A. Stevens, Logan E. Shephard, Eyerusalem H. Mamo, Evan J. Morris, Shamah Lloyd
  • Publication number: 20190367649
    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: Application
    Filed: May 29, 2019
    Publication date: December 5, 2019
    Inventors: Matthew W. Holtcamp, Laughlin G. McCullough, Kevin A. Stevens, Subramaniam Kuppuswamy, Matthew S. Bedoya
  • Publication number: 20190284312
    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: January 17, 2019
    Publication date: September 19, 2019
    Inventors: Matthew W. Holtcamp, Subramaniam Kuppuswamy, Matthew S. Bedoya, Kevin A. Stevens, Ching-Tai Lue, Hasnain Rangwalla
  • Publication number: 20190263953
    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: Application
    Filed: May 13, 2019
    Publication date: August 29, 2019
    Inventors: Dongming Li, Jian Yang, Kevin A. Stevens, Yan Jiang, Gregory J. Smith-Karahalis
  • Publication number: 20190233552
    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 7000 g/mol to 70000 g/mol and a PDI from 4.1 to 9.0.
    Type: Application
    Filed: January 17, 2019
    Publication date: August 1, 2019
    Inventors: Matthew W. Holtcamp, Subramaniam Kuppuswamy, Matthew S. Bedoya, Kevin A. Stevens
  • Publication number: 20190168203
    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: November 30, 2018
    Publication date: June 6, 2019
    Inventors: Matthew W. Holtcamp, Kevin A. Stevens, Laughlin G. McCullough, David F. Sanders, Subramaniam Kuppuswamy, Matthew S. Bedoya
  • Publication number: 20190112844
    Abstract: A vehicle hood pin apparatus is disclosed which contains an outer housing with holes to accept a cotter pin or other self-locking device, an inner pin with holes that can mate with the holes on the outer housing, and an electric switch attached to the housing to communicate signals to the vehicle, and in mechanical connection with the inner pin. By mating the holes in the inner pin with the holes in the outer housing and inserting the cotter pin or other self-locking device into the mated holes, the hood is closed securely on the vehicle and the electric switch sends a signal to the vehicle.
    Type: Application
    Filed: October 10, 2018
    Publication date: April 18, 2019
    Inventor: Kevin Steven Ford
  • Patent number: 10173811
    Abstract: The disclosed aspects relate to a dual hinge flip cap closure. The closure includes a skirt that operatively engages a container. The closure also includes a top connected to the skirt at a first hinge, wherein the top is movable relative to the skirt. Further, the closure includes a lid operatively attached to the top at a second hinge, wherein the lid is movable relative to the top, and wherein a distal end of the lid is at an opposite of the top relative to the first hinge and the second hinge is between the first hinge and the end of the lid.
    Type: Grant
    Filed: June 18, 2015
    Date of Patent: January 8, 2019
    Assignee: WEATHERCHEM CORPORATION
    Inventors: Kevin Stevens, Brian David Groubert
  • Publication number: 20160159998
    Abstract: A prepreg for manufacturing a fibre-reinforced composite material, the prepreg including a body having a layer of fibrous reinforcement impregnated with a matrix resin material, and a powder coating layer of resin material on at least one major surface of the body and at least partly fused to the matrix resin material
    Type: Application
    Filed: July 17, 2014
    Publication date: June 9, 2016
    Inventors: Paul SPENCER, Kevin Steven CADD
  • Patent number: 9345942
    Abstract: There is described a carrier, such as a backpack, waist bag or bum bag, which includes a retractable towing belt assembly, suitable for towing children along a ski slope.
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: May 24, 2016
    Inventor: Kevin Stevens
  • Publication number: 20160015607
    Abstract: A shaving oil wipe made from combining a wipe or wipe-type product with natural fats or oils for shaving. The shaving oil wipe includes a package unit and at least one shaving oil wipe received in the package unit. The shaving oil wipe includes a fibrous carrier and a shaving oil composed of oils from either natural or synthetic sources. The shaving oil is disposed on the surface of the fibrous carrier or impregnated on the fibrous carrier. When the shaving oil of the shaving oil wipe is applied on a user's skin, a layer of oil is produced on the skin to provide good lubrication for shaving. Convenience of usage, good portability, and efficient application of shaving oil to skin are advantages.
    Type: Application
    Filed: May 1, 2015
    Publication date: January 21, 2016
    Inventor: John Kevin Stevens
  • Publication number: 20150368002
    Abstract: The disclosed aspects relate to a dual hinge flip cap closure. The closure includes a skirt that operatively engages a container. The closure also includes a top connected to the skirt at a first hinge, wherein the top is movable relative to the skirt. Further, the closure includes a lid operatively attached to the top at a second hinge, wherein the lid is movable relative to the top, and wherein a distal end of the lid is at an opposite of the top relative to the first hinge and the second hinge is between the first hinge and the end of the lid.
    Type: Application
    Filed: June 18, 2015
    Publication date: December 24, 2015
    Inventors: Kevin Stevens, Brian David Groubert