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Larry G Sneddon

age ~77

from Newtown Square, PA

Also known as:
  • Larry Sneddon
  • Lawrence Sneddon
  • Laurence Sneddon
Phone and address:
813 Briarwood Rd, Newtown Square, PA 19073
610-353-0130

Larry Sneddon Phones & Addresses

  • 813 Briarwood Rd, Newtown Sq, PA 19073 • 610-353-0130
  • Newtown Square, PA
  • Havertown, PA

Work

  • Position:
    Professional/Technical

Education

  • Degree:
    Graduate or professional degree

Us Patents

  • Method For Making Boron Carbide Containing Ceramics

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  • US Patent:
    6478994, Nov 12, 2002
  • Filed:
    Mar 30, 2000
  • Appl. No.:
    09/539182
  • Inventors:
    Larry G. Sneddon - Newtown Square PA
    Mark J. Pender - Philadelphia PA
  • Assignee:
    Trustees of the University of Pennsylvania - Philadelphia PA
  • International Classification:
    C23C 1632
  • US Classification:
    264 43, 264625, 423291, 4272495
  • Abstract:
    A method for making a boron carbide containing ceramic involves pyrolyzing a precursor having one or more monosubstituted decaboranyl groups and at least one substituting group containing carbon. The precursor may be molecular, for example comprising two decaboranyl groups linked by a single substituting group, or polymeric, in which case the decaboranyl groups are part of the pendant group of the polymer while a portion of the substituting group makes up the polymer backbone. In either case, the substituting group may be a hydrocarbon, in which case boron carbide may be formed. Alternatively, the substituting group may contain carbon and another ceramic forming element (i. e. , other than boron or carbon), such as silicon, nitrogen, or phosphorous, in which case a composite including boron carbide is formed. The precursors used in the present invention are relatively stable in air, allow access to both boron rich and carbon rich materials, and further allow for the formation of films, fibers, and nanostructured materials more easily than other precursors.
  • Borazine Derivatized Polycarbosilane Polymers And The Ceramics Derived Therefrom

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  • US Patent:
    52567532, Oct 26, 1993
  • Filed:
    Nov 2, 1992
  • Appl. No.:
    7/970517
  • Inventors:
    Gregg A. Zank - Midland MI
    Larry G. Sneddon - Newtown Square PA
    Kai Su - Philadelphia PA
  • International Classification:
    C08G 7908
  • US Classification:
    528 7
  • Abstract:
    The present invention relates to a method of preparing borazine modified polycarbosilane polymers. The method comprises reacting a polycarbosilane polymer with a material comprising at least borazine ring for a time sufficient to produce the desired polymer. This invention also relates to the novel polymers produced by the above method and the ceramic products derived from heating the novel polymers to greater than about 800. degree. C.
  • Poly(B-Alkenyl-Borazine) Ceramic Precursors

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  • US Patent:
    52023990, Apr 13, 1993
  • Filed:
    Jan 21, 1992
  • Appl. No.:
    7/824705
  • Inventors:
    Larry G. Sneddon - Havertown PA
    Anne T. Lynch - Fairfield CT
  • Assignee:
    Truste of the University of Pennsylvania - Philadelphia PA
  • International Classification:
    C08F 3006
  • US Classification:
    526239
  • Abstract:
    Novel poly(B-alkenyl-borazines), such as poly(B-vinyl borazine), are useful as precursors to BN ceramics. The poly alkenylborazines, which may advantageously be soluble and easily processed, are prepared by heat treatment of corresponding B-alkenylborazines, which are themselves novel compounds.
  • Poly (B-Alkenyl-Borazine) Ceramic Precursors

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  • US Patent:
    54897076, Feb 6, 1996
  • Filed:
    Oct 11, 1994
  • Appl. No.:
    8/320276
  • Inventors:
    Larry G. Sneddon - Havertown PA
    Anne T. Lynch - Fairfield CT
  • Assignee:
    The Trustees of the University of Pennsylvania - Philadelphia PA
  • International Classification:
    C07F 505
  • US Classification:
    564 10
  • Abstract:
    Novel poly(B-alkenyl-borazines), such as poly(B-vinyl borazine), are useful as precursors to BN ceramics. The poly alkenylborazines, which may advantageously be soluble and easily processed, are prepared by heat treatment of corresponding B-alkenylborazines, which are themselves novel compounds.
  • Poly(Alkenylpentaborane) Ceramic Precursors

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  • US Patent:
    49467131, Aug 7, 1990
  • Filed:
    Feb 9, 1988
  • Appl. No.:
    7/153995
  • Inventors:
    Larry G. Sneddon - Havertown PA
    Mario G. L. Mirabelli - Philadelphia PA
  • Assignee:
    University of Pennsylvania - Philadelphia PA
  • International Classification:
    B05D 302
    C01B 21064
    C08F13006
  • US Classification:
    427226
  • Abstract:
    Novel poly(alkenylpentaboranes) such as poly-2-vinylpentaborane are useful as precursors to BN or B. sub. 4 C ceramics. The non-crosslinked poly(alkenylpentaboranes), which are soluble in common inert organic solvents, are prepared heat treatment of corresponding alkenylpentaboranes. The non-crosslinked poly(alkenylpentaboranes) are heated under an inert atmosphere to crosslink them, and the crosslinked products are pyrolyzed to yield B. sub. 4 C. Alternatively, the non-crosslinked poly(alkenylpentaboranes) are heated in the presence of ammonia to yield a nitrogen-containing polymer which, upon pyrolysis, yields BN.
  • Direct Thermal Synthesis And Ceramic Applications Of Poly(Borazylenes)

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  • US Patent:
    55021425, Mar 26, 1996
  • Filed:
    Oct 26, 1993
  • Appl. No.:
    8/143524
  • Inventors:
    Larry G. Sneddon - Havertown PA
    Jeffrey S. Beck - Princeton NJ
    Paul J. Fazen - Wenonah NJ
  • Assignee:
    The Trustees of the University of Pennsylvania - Philadelphia PA
  • International Classification:
    C08G 7908
  • US Classification:
    528 7
  • Abstract:
    Direct thermal syntheses in the absence of catalyst, of poly(borazylenes) and of oligomers of borazine with polyhedral boranes, carboranes or heteroboranes are disclosed. The products of these syntheses are precursors to BN or other boron-containing ceramics.
  • Direct Thermal Synthesis And Ceramic Applications Of Poly(Borazylenes) And Borazine/Polyhedral Borane Oligomers

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  • US Patent:
    60254548, Feb 15, 2000
  • Filed:
    Dec 5, 1996
  • Appl. No.:
    8/760708
  • Inventors:
    Larry G. Sneddon - Havertown PA
    Jeffrey Scott Beck - Princeton NJ
    Paul Joseph Fazen - Wenonah NJ
  • Assignee:
    The Trustees of the University of Pennsylvania - Philadelphia PA
  • International Classification:
    C08G 7908
  • US Classification:
    528 7
  • Abstract:
    Direct thermal syntheses in the absence of catalyst, of poly(borazylenes) and of oligomers of borazine with polyhedral boranes, carboranes or heteroboranes are disclosed. The products of these syntheses are precursors to BN or other boron-containing ceramics.
  • Borazine Derivatized Hydridopolysilazane Polymers

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  • US Patent:
    52526844, Oct 12, 1993
  • Filed:
    Nov 2, 1992
  • Appl. No.:
    7/970505
  • Inventors:
    Gregg A. Zank - Midland MI
    Larry G. Sneddon - Newtown Square PA
    Kai Su - Philadelphia PA
  • International Classification:
    C08F28300
  • US Classification:
    525474
  • Abstract:
    The present invention relates to a method of preparing borazine modified hydridopolysilazane polymers. The method comprises reacting a hydridopolysilazane polymer with a material comprising at least one borazine ring for a time sufficient to produce the desired polymer. This invention also relates to the novel polymers produced by the above method.

Resumes

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