Patents by Inventor David M. Szum

David M. Szum 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: 20090171011
    Abstract: Optical fiber coatings are disclosed having excellent ribbon stripping and adhesion behavior. The coatings are radiation-curable. The excellent stripping and adhesion behavior can be achieved by several means which include by use of additives, by use of radiation-curable oligomers having higher molecular weight, or by use of coatings having certain thermal properties. Combination of means can be employed. Stripping behavior can be measured by crack propagation and fiber friction measurements.
    Type: Application
    Filed: November 14, 2008
    Publication date: July 2, 2009
    Applicant: DSM IP ASSETS B.V.
    Inventors: David M. Szum, Chander P. Chawla, James R. Petisce, John T. Vandeberg, George Pasternack, Timothy E. Bishop, Paul E. Snowwhite, Edward P. Zahora, Stephen C. Lapin
  • Patent number: 7171103
    Abstract: A coated optical fiber can have a primary coating and a secondary coating, where the primary coating can have good microbending resistance and is obtained by curing a composition having a high cure speed. In one example, a coated optical fiber can include as optical fiber, a primary coating and a secondary coating. The optical fiber can have an attenuation increase of less than 0.650 dB/km at 1550 nm, with the primary coating having a modulus retention ratio of at least 0.5, a glass transition temperature of ?35° C., and where the primary coating is obtained by curing a primary coating composition having a cure dose to attain 95% of the maximum attainable modulus of less than 0.65 J/cm2.
    Type: Grant
    Filed: October 3, 2005
    Date of Patent: January 30, 2007
    Assignee: DSM IP Assets B.V
    Inventors: Jan van Eekelen, Sandra Nagelvoort, Duurt Alkema, Paul Buijsen, Huimin Cao, Robert W. Johnson, David M. Szum
  • Patent number: 6961508
    Abstract: A coated optical fiber can have a primary coating and a secondary coating, where the primary coating can have good microbending resistance and is obtained by curing a composition having a high cure speed. In one example, a coated optical fiber can include as optical fiber, a primary coating and a secondary coating. The optical fiber can have an attenuation increase of less than 0.650 dB/km at 1550 nm, with the primary coating having a modulus retention ratio of at least 0.5, a glass transition temperature of ?35° C., and where the primary coating is obtained by curing a primary coating composition having a cure dose to attain 95% of the maximum attainable modulus of less than 0.65 J/cm2.
    Type: Grant
    Filed: April 24, 2003
    Date of Patent: November 1, 2005
    Assignee: DSM IP Assets B.V.
    Inventors: Jan van Eekelen, Sandra Nagelvoort, Duurt Alkema, Paul Buijsen, Huimin Cao, Robert W. Johnson, David M. Szum
  • Publication number: 20040022511
    Abstract: The present invention provides a coated optical fiber having a primary coating and a secondary coating, wherein the primary coating has good attenuation loss resistance and is obtained by curing a composition having high cure speed.
    Type: Application
    Filed: April 23, 2003
    Publication date: February 5, 2004
    Inventors: Jan van Eekelen, Sandra Nagelvoort, Duurt Alkema, Paul Buijsen, Huimin Cao, Robert W. Johnson, David M. Szum
  • Publication number: 20040013382
    Abstract: The present invention provides a coated optical fiber having a primary coating and a secondary coating, wherein the primary coating has good microbending resistance and is obtained by curing a composition having high cure speed.
    Type: Application
    Filed: April 24, 2003
    Publication date: January 22, 2004
    Inventors: Jan van Eekelen, Sandra Nagelvoort, Duurt Alkema, Paul Buijsen, Huimin Cao, Robert W. Johnson, David M. Szum
  • Patent number: 6680118
    Abstract: A radiation-curable composition is disclosed. An fluorinated oligomer is combined with a diluent monomer and a photoinitiator to form the radiation-curable coating composition. The fluorinated oligomer is substantially free of isocyanate groups. The radiation-curable compositions provide a suitable coating for substrates, are resistant to penetration by water and liquid hydrocarbons, retain their physical properties over a wide temperature range and exhibit immeasurably low surface friction properties.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: January 20, 2004
    Assignee: DSM N.V.
    Inventors: David M. Szum, Kevin P. Murray, John M. Zimmerman
  • Patent number: 6661959
    Abstract: Optical fiber coatings are disclosed having excellent ribbon stripping and adhesion behavior. The coatings are radiation-curable. The excellent stripping and adhesion behavior can be achieved by several means which include by use of additives, by use of radiation-curable oligomers having higher molecular weight, or by use of coatings having certain thermal properties. Combination of means can be employed. Stripping behavior can be measured by crack propagation and fiber friction measurements.
    Type: Grant
    Filed: December 6, 2001
    Date of Patent: December 9, 2003
    Assignee: DSM N.V.
    Inventors: David M. Szum, Chander P. Chawla, James R. Petisce, John T. Vandeberg, George Pasternack, Timothy E. Bishop, Paul E. Snowwhite, Edward P. Zahora, Stephen C. Lapin
  • Publication number: 20030147614
    Abstract: Optical fiber coatings are disclosed having excellent ribbon stripping and adhesion behavior. The coatings are radiation-curable. The excellent stripping and adhesion behavior can be achieved by several means which include by use of additives, by use of radiation-curable oligomers having higher molecular weight, or by use of coatings having certain thermal properties. Combination of means can be employed. Stripping behavior can be measured by crack propagation and fiber friction measurements.
    Type: Application
    Filed: April 10, 2002
    Publication date: August 7, 2003
    Applicant: DSM N.V.
    Inventors: David M. Szum, Chander P. Chawla, James R. Petisce, John T. Vandeberg, George Pasternack, Timothy E. Bishop, Paul E. Snowwhite, Edward P. Zahora, Stephen C. Lapin
  • Publication number: 20030147615
    Abstract: Optical fiber coatings are disclosed having excellent ribbon stripping and adhesion behavior. The coatings are radiation-curable. The excellent stripping and adhesion behavior can be achieved by several means which include by use of additives, by use of radiation-curable oligomers having higher molecular weight, or by use of coatings having certain thermal properties. Combination of means can be employed. Stripping behavior can be measured by crack propagation and fiber friction measurements.
    Type: Application
    Filed: June 5, 2002
    Publication date: August 7, 2003
    Inventors: David M. Szum, Chander P. Chawla, James R. Petisce, John T. Vandeberg, George Pasternack, Timothy E. Bishop, Paul E. Snowwhite, Edward P. Zahora, Stephen C. Lapin
  • Patent number: 6534557
    Abstract: Optical fiber primary coating systems are disclosed having excellent ribbon stripping and adhesion behavior. The coatings are radiation-curable. The excellent stripping and adhesion behavior can be inner piramry coating composition having a slip enhancing component and a high modulus outer primary coating composition. Combination of means can be employed. Stripping behavior can be measured by crack propagation and fiber friction measurements.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: March 18, 2003
    Assignee: DSM N.V.
    Inventors: David M. Szum, Chander P. Chawla, James R. Petisce, George Pasternack, Timothy E. Bishop, Paul E. Snowwhite, Edward P. Zahora
  • Publication number: 20020183415
    Abstract: Optical fiber primary coating systems are disclosed having excellent ribbon stripping and adhesion behavior. The coatings are radiation-curable. The excellent stripping and adhesion behavior can be inner piramry coating composition having a slip enhancing component and a high modulus outer primary coating composition. Combination of means can be employed. Stripping behavior can be measured by crack propagation and fiber friction measurements.
    Type: Application
    Filed: July 15, 1999
    Publication date: December 5, 2002
    Inventors: DAVID M. SZUM, CHANDER P. CHAWLA, JAMES R. PETISCE, GEORGE PASTERNACK, TIMOTHY E. BISHOP, PAUL E. SNOWWHITE, EDWARD P. ZAHORA
  • Publication number: 20020182410
    Abstract: A radiation-curable composition is disclosed. An fluorinated oligomer is combined with a diluent monomer and a photoinitiator to form the radiation-curable coating composition. The fluorinated oligomer is substantially free of isocyanate groups. The radiation-curable compositions provide a suitable coating for substrates, are resistant to penetration by water and liquid hydrocarbons, retain their physical properties over a wide temperature range and exhibit immeasurably low surface friction properties.
    Type: Application
    Filed: February 28, 2002
    Publication date: December 5, 2002
    Inventors: David M. Szum, Kevin P. Murray, John M. Zimmerman
  • Publication number: 20020181913
    Abstract: Optical fiber coatings are disclosed having excellent ribbon stripping and adhesion behavior. The coatings are radiation-curable. The excellent stripping and adhesion behavior can be achieved by several means which include by use of additives, by use of radiation-curable oligomers having higher molecular weight, or by use of coatings having certain thermal properties. Combination of means can be employed. Stripping behavior can be measured by crack propagation and fiber friction measurements.
    Type: Application
    Filed: April 10, 2002
    Publication date: December 5, 2002
    Applicant: DSM N.V.
    Inventors: David M. Szum, Chander P. Chawla, James R. Petisce, John T. Vandeberg, George Pasternack, Timothy E. Bishop, Paul E. Snowwhite, Edward P. Zahora, Stephen C. Lapin
  • Publication number: 20020168163
    Abstract: Optical fiber coatings are disclosed having excellent ribbon stripping and adhesion behavior. The coatings are radiation-curable. The excellent stripping and adhesion behavior can be achieved by several means which include by use of additives, by use of radiation-curable oligomers having higher molecular weight, or by use of coatings having certain thermal properties. Combination of means can be employed. Stripping behavior can be measured by crack propagation and fiber friction measurements.
    Type: Application
    Filed: December 6, 2001
    Publication date: November 14, 2002
    Inventors: David M. Szum, Chander P. Chawla, James R. Petisce, John T. Vandeberg, George Pasternack, Timothy E. Bishop, Paul E. Snowwhite, Edward P. Zahora, Stephen C. Lapin
  • Patent number: 6472450
    Abstract: Provided is a radiation-curable, glass optical fiber coating composition which when suitably cured exhibits resistance to attack from hydrocarbon gel cable filing material. The composition contains about 10 to about 90% by weight of a first radiation-curable oligomer; from 0 to about 40% by weight of a reactive diluent; from 0 to about 40% by weight of a photoinitiator; from 0 to about 10% by weight of a pigment; and about 10 to about 90% by weight of a second radiation-curable oligomer according to the following formula: R1-L1-C1-L2-R2  (1) where: R1 and R2, independently, each represent a radiation-curable functional group; L1 and L2, independently, each represent an an alkyleneoxy chain having from about 2 to about 40 carbon atoms, wherein L1 and L2 are linked to C1 through an oxygen atom C1 comprises a hydrocarbon having from about 5 to about 40 carbon atoms and containing at least one cyclic group.
    Type: Grant
    Filed: January 10, 2000
    Date of Patent: October 29, 2002
    Assignee: DSM N.V.
    Inventors: David M. Szum, Timothy E. Bishop, Steven R. Schmid
  • Publication number: 20020102077
    Abstract: Radiation-curable compositions are disclosed which, after cure, are substantially non-yellowing. The compositions are particularly tailored for coating and bundling of optical fibers. A first preferred composition is based on a polyether-type of oligomer diluted with reactive diluents. Isocyanurate structures are included in the composition to raise Tg. A second preferred composition is based on fatty oil comprising (meth)acrylate groups and bisphenol A derivatives comprising (meth)acrylate groups. Photoinitiators can be included to increase cure speed. The formulations do not include material amounts of ingredients which tend to cause yellowing or, in theory, extended conjugation in the cured compositions.
    Type: Application
    Filed: October 12, 2001
    Publication date: August 1, 2002
    Inventors: David M. Szum, Adrianus G.M. Abel
  • Publication number: 20020064357
    Abstract: Optical fiber coatings are disclosed having excellent ribbon stripping and adhesion behavior. The coatings are radiation-curable. The excellent stripping and adhesion behavior can be achieved by several means which include by use of additives, by use of radiation-curable oligomers having higher molecular weight, or by use of coatings having certain thermal properties. Combination of means can be employed. Stripping behavior can be measured by crack propagation and fiber friction measurements.
    Type: Application
    Filed: January 11, 2001
    Publication date: May 30, 2002
    Applicant: DSM N.V.
    Inventors: David M. Szum, Chander P. Chawla, James R. Petisce, John T. Vandeberg, George Pasternack, Timothy E. Bishop, Paul E. Snowwhite, Edward P. Zahora, Stephen C. Lapin
  • Patent number: 6391459
    Abstract: A radiation-curable composition is disclosed. An fluorinated oligomer is combined with a diluent monomer and a photoinitiator to form the radiation-curable coating composition. The fluorinated oligomer is substantially free of isocyanate groups. The radiation-curable compositions provide a suitable coating for substrates, are resistant to penetration by water and liquid hydrocarbons, retain their physical properties over a wide temperature range and exhibit immeasurably low surface friction properties.
    Type: Grant
    Filed: May 6, 1994
    Date of Patent: May 21, 2002
    Assignee: DSM N.V.
    Inventors: David M. Szum, Kevin P. Murray, John M. Zimmerman
  • Publication number: 20020057885
    Abstract: Provided is a radiation-curable, glass optical fiber coating composition which when suitably cured exhibits resistance to attack from hydrocarbon gel cable filing material.
    Type: Application
    Filed: January 10, 2000
    Publication date: May 16, 2002
    Inventors: David M. Szum, Timothy E. Bishop, Steven R. Schmid
  • Publication number: 20020037146
    Abstract: Optical fiber coatings are disclosed having excellent ribbon stripping and adhesion behavior. The coatings are radiation-curable. The excellent stripping and adhesion behavior can be achieved by several means which include by use of additives, by use of radiation-curable oligomers having higher molecular weight, or by use of coatings having certain thermal properties. Combination of means can be employed. Stripping behavior can be measured by crack propagation and fiber friction measurements.
    Type: Application
    Filed: January 11, 2001
    Publication date: March 28, 2002
    Applicant: DSM N.V.
    Inventors: David M. Szum, Chander P. Chawla, James R. Petisce, John T. Vandeberg, George Pasternack, Timothy E. Bishop, Paul E. Snowwhite, Edward P. Zahora, Stephen C. Lapin