Patents by Inventor Clyde H. Sheppard
Clyde H. Sheppard 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).
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Patent number: 6583255Abstract: High performance polyester sulfone oligomers are prepared for aerospace applications by condensing mono- or difunctional crosslinkable end caps (i.e. unsaturated hydrocarbons having one or two crosslinking sites) with dicarboxylic acid halides and dialcohols (i.e. diols). Multidimensional oligomers have an aromatic hub from which the polyester chains radiate. Blends of the linear and multidimensional oligomers can be made using compatible, non-crosslinking polymers. Prepregs and composites are formed from the oligomers or blends.Type: GrantFiled: June 5, 1995Date of Patent: June 24, 2003Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard
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Patent number: 6569954Abstract: The physical properties of high performance composites can be tailored by using blends to make the composites. The resulting composites are relatively easy to make and have long-term, high performance capabilities even in harsh service conditions. The blends of the present invention include at least one oligomer having an aromatic, aliphatic, or mixed aromatic and aliphatic backbone from one chemical family and an unsaturated hydrocarbon end cap and at least one polymer from a different chemical family. Upon curing, the oligomer in the blend addition polymerize to form composites possessing advanced properties with respect to those exhibited by the pure oligomer or the pure polymer. Coreactive oligomer blends can be used instead of a pure oligomer to form composites that include addition polymers, block copolymers, and the compatible polymer, thereby further achieving a tailoring of properties in the cured composite. The blends can be prepregged and cured to form composites.Type: GrantFiled: June 7, 1995Date of Patent: May 27, 2003Assignee: The Boeing companyInventors: Clyde H. Sheppard, Hyman R. Lubowitz
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Patent number: 5968640Abstract: The morphology of multidimensional, thermally stable oligomers is combined with the inclusion of charge carrier linkages within the polymer arms to produce thermally stable advanced composites from cured oligomers that are conductive or semiconductive if suitably doped.Type: GrantFiled: September 5, 1985Date of Patent: October 19, 1999Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard, Larry P. Torre
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Patent number: 5969079Abstract: Thermomechanical and thermo-oxidative stabilities in resin composites across the range of aerospace "engineering thermoplastic" resins are improved by forming four crosslinks at each addition polymerization site in the backbone of the resin using crosslinking functionalities of the general formula: ##STR1## wherein Z= ##STR2## .beta.=the residue an organic radical selected from the group consisting of: ##STR3## R.sub.R =a divalent organic radical; X=halogen;Me=methylT=allyl or methallyl.G=--CH.sub.2 --,--S--, --CO--, --SO--, --O--, --CHR.sub.3 --, or --C(R.sub.3).sub.2 --;i=1 or 2;R.sub.3 =hydrogen, lower alkyl, lower alkoxy, aryl, or aryloxy; and.theta.=--C.tbd.N, --O--C.tbd.N, --S--C.tbd.N, or --CR.sub.3 .dbd.C(R.sub.3).sub.Type: GrantFiled: October 21, 1994Date of Patent: October 19, 1999Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard
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Patent number: 5817738Abstract: The morphology of multidimensional oligomers is combined with the inclusion of charge carrier linkages within the oligomer arms to produce oligomers that are useful for preparing conductive or semiconductive composites, if suitably doped. The Schiff base linkages are prepared by the condensation of aldehydes and amines. The oligomers can be blended, and either the oligomers or their blends can be prepregged.Type: GrantFiled: June 27, 1988Date of Patent: October 6, 1998Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard, Larry P. Torre
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Patent number: 5817744Abstract: The physical properties of high performance composites can be tailored by using blends to make the composites. The resulting composites are relatively easy to make and have long-term, high performance capabilities even in harsh service conditions. The blends of the present invention include at least one oligomer having an aromatic, aliphatic, or mixed aromatic and aliphatic backbone from one chemical family and an unsaturated hydrocarbon end cap and at least one polymer from a different chemical family. Upon curing, the oligomer in the blend addition polymerize to form composites possessing advanced properties with respect to those exhibited by the pure oligomer or the pure polymer. Coreactive oligomer blends can be used instead of a pure oligomer to form composites that include addition polymers, block copolymers, and the compatible polymer, thereby further achieving a tailoring of properties in the cured composite. The blends can be prepregged and cured to form composites.Type: GrantFiled: February 14, 1997Date of Patent: October 6, 1998Assignee: The Boeing CompanyInventors: Clyde H. Sheppard, Hyman R. Lubowitz
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Patent number: 5780583Abstract: Crosslinkable poly(arylene sulfide) oligomers are prepared by reaction of a dihaloaromatic compound, a sulfur compound that is reactive with halo organic compounds to form thioethers, and an end cap monomer corresponding to the formula:A.sub.i --Ar--Xwhere A is an alpha, beta-unsaturated hydrocarbon moiety that is subject to step growth reaction by chemical activation, or by thermal activation at temperatures substantially in excess of the temperature of formation of the oligomer. Both linear and multidimensional oligomers are disclosed.Type: GrantFiled: January 9, 1991Date of Patent: July 14, 1998Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard
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Patent number: 5756645Abstract: The yield of fully substituted, multidimensional aromatic hubs in the condensation of hydroxyl and acid halide functionalities is improved by adding a thallium catalyst, such as thallium ethoxide (Tl-OC.sub.2 H.sub.5), in the solvent.Type: GrantFiled: June 6, 1995Date of Patent: May 26, 1998Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard, Ronald R. Stephenson
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Patent number: 5756597Abstract: Thermomechanical and thermo-oxidative stabilities in resin composites across the range of aerospace "engineering thermoplastic" resins are improved by forming four crosslinks at each addition polymerization site in the backbone of the resin using crosslinking functionalities of the general formula: ##STR1## in the oligomers, wherein ##STR2## .beta.=the residue an organic radical selected from the group consisting of: ##STR3## R.sub.8 =a divalent organic radical; X=halogen;Me=methylT=allyl or methallyl,G=--CH.sub.2 --, --S--, --CO--, --SO--, --O--, --CHR.sub.3 --, or --C(R.sub.3).sub.2 --;i=1 or 2;R.sub.3 =hydrogen, lower alkyl, lower alkoxy, aryl, or aryloxy; and.THETA.=--C.tbd.N, --O--C.tbd.N, --S--C.tbd.N, or --CR.sub.3 .dbd.C(R.sub.3).sub.2.Type: GrantFiled: February 12, 1997Date of Patent: May 26, 1998Assignee: The Boeing CompanyInventors: Hyman R. Lubowtiz, Clyde H. Sheppard
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Patent number: 5739256Abstract: High performance polyester sulfone oligomers are prepared for aerospace applications by condensing mono- or difunctional crosslinkable end caps (i.e. unsaturated hydrocarbons having one or two crosslinking sites) with dicarboxylic acid halides and dialcohols (i.e. diols). Multidimensional oligomers have an aromatic hub from which the polyester chains radiate. Blends of the linear and multidimensional oligomers can be made using compatible, non-crosslinking polymers. Prepregs and composites are formed from the oligomers or blends.Type: GrantFiled: June 5, 1995Date of Patent: April 14, 1998Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard
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Patent number: 5714566Abstract: Thermomechanical and thermo-oxidative stabilities in resin composites across the range of aerospace "engineering thermoplastic" resins are improved by forming four crosslinks at each addition polymerization site in the backbone of the resin using crosslinking functionalities of the general formula: ##STR1## in the oligomers, wherein Z= ##STR2## .beta.=the residue an organic radical selected from the group consisting of: ##STR3## --O--.O slashed.--COOH, --O--.O slashed.--COX, --X, --O.paren open-st.(R.sub.8 .paren close-st.OH, ##STR4## --O--.O slashed.--NH.sub.2 ; E= ##STR5## R.sub.8 =a divalent organic radical; X=halogen;Me=methylT=allyl or methallyl.G=--CH.sub.2 --, --S--, --CO--, --SO--, --O--, --CHR.sub.3 --, or --C(R.sub.3).sub.2 --;i=1 or 2;R.sub.3 =hydrogen, lower alkyl, lower alkoxy, aryl, or aryloxy; and.THETA.=--C.tbd.N; --O--C.tbd.N, --S--C.tbd.N, or --CR.sub.3 .dbd.C(R.sub.3).sub.2.Type: GrantFiled: June 5, 1995Date of Patent: February 3, 1998Assignee: The Boeing CompanyInventors: Hyman R. Lubowtiz, Clyde H. Sheppard
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Patent number: 5705574Abstract: Polyimide oligomers include (1) linear, mono-functional crosslinking oligomers prepared by condensing a monoanhydride end cap with a diamine that includes alternating ether and "sulfone" (--SO.sub.2 --, --S--, --CO--, --(CF.sub.3).sub.2 C--, or --(CH.sub.3).sub.2 C--) linkages connecting alternating aromatic radicals and with a dianhydride (or dianhydride mixture), particularly the unsaturated, aliphatic dianhydride commonly known as MCTC; (2) linear, mono- or difunctional crosslinking oligomers prepared by condensing an amine end cap with a diamine and a dianhydride; and (3) multidimensional, crosslinking oligomers having an aromatic hub and at least three radiating arms connected to the hub, each arm including a crosslinking end cap at its distal end and at least one imide linkage.Blends, prepregs, and composites can be prepared from the oligomers.Type: GrantFiled: June 5, 1995Date of Patent: January 6, 1998Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard
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Patent number: 5705598Abstract: High performance polyester sulfone oligomers are prepared for aerospace applications by condensing mono- or difunctional crosslinkable end caps (i.e. unsaturated hydrocarbons having one or two crosslinking sites) with dicarboxylic acid halides and dialcobols (i.e. diols). Multidimensional oligomers have an aromatic hub from which the polyester chains radiate. Blends of the linear and multidimensional oligomers can be made using compatible, non-crosslinking polymers. Prepregs and composites are formed from the oligomers or blends.Type: GrantFiled: December 23, 1987Date of Patent: January 6, 1998Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard
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Patent number: 5693741Abstract: Low molecular weight resins that usually are aliphatic and that include crosslinking thermal functional groups are useful as liquid molding compounds for reaction injection molding or resin transfer molding. The compounds eliminate the need to handle solvents when preparing thermoset composites.Type: GrantFiled: March 15, 1988Date of Patent: December 2, 1997Assignee: The Boeing CompanyInventors: Clyde H. Sheppard, Hyman R. Lubowitz
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Patent number: 5654396Abstract: We achieve solvent resistance and extended use life for advanced polyimides by including at least some solvent-resistant linkages in the backbone in place of phenoxyphenyl sulfone linkages and using diPEPA or PEPA crosslinking end caps.Type: GrantFiled: June 5, 1995Date of Patent: August 5, 1997Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard
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Patent number: 5645925Abstract: The physical properties of high performance composites can be tailored by using blends to make the composites. The resulting composites are relatively easy to make and have long-term, high performance capabilities even in harsh service conditions. The blends of the present invention include at least one oligomer having an aromatic, aliphatic, or mixed aromatic and aliphatic backbone from one chemical family and an unsaturated hydrocarbon end cap and at least one polymer from a different chemical family. Upon curing, the oligomer in the blend addition polymerize to form composites possessing advanced properties with respect to those exhibited by the pure oligomer or the pure polymer. Coreactive oligomer blends can be used instead of a pure oligomer to form composites that include addition polymers, block copolymers, and the compatible polymer, thereby further achieving a tailoring of properties in the cured composite. The blends can be prepregged and cured to form composites.Type: GrantFiled: November 29, 1990Date of Patent: July 8, 1997Assignee: Boeing CompanyInventors: Clyde H. Sheppard, Hyman R. Lubowitz
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Patent number: 5618907Abstract: The yield of fully substituted, multidimensional aromatic hubs in the condensation of hydroxyl and acid halide functionalities is improved by adding a thallium catalyst, such as thallium ethoxide (Tl--OC.sub.2 H.sub.5), in the solvent.Type: GrantFiled: June 5, 1995Date of Patent: April 8, 1997Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard, Ronald R. Stephenson
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Patent number: 5610317Abstract: Thermomechanical and thermo-oxidative stabilities in resin composites across the range of aerospace "engineering thermoplastic" resins are improved by forming four crosslinks at each addition polymerization site in the backbone of the resin using crosslinking functionalities of the general formula: ##STR1## .beta.=the residue an organic radical selected from the group consisting of: ##STR2## R.sub.8 =a divalent organic radical; X=halogen;Me=methylT=allyl or methallyl.G=--CH.sub.2 --, --S--, --CO--, --SO--, --O--, --CHR.sub.3 --, or --C(R.sub.3).sub.2 --;i=1 or 2;R.sub.3 =hydrogen, lower alkyl, lower alkoxy, aryl, or aryloxy; and.THETA.=--C.tbd.N, --O--C.tbd.N, --S--C.tbd.N, or --CR.sub.3 .dbd.C(R.sub.3).sub.2.Type: GrantFiled: June 5, 1995Date of Patent: March 11, 1997Assignee: The Boeing CompanyInventors: Hyman R. Lubowtiz, Clyde H. Sheppard
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Patent number: 5602226Abstract: The yield of fully substituted, multidimensional aromatic hubs in the condensation of hydroxyl and acid halide functionalities is improved by adding a thallium catalyst, such as thallium ethoxide (T1-OC.sub.2 H.sub.5), in the solvent.Type: GrantFiled: June 6, 1995Date of Patent: February 11, 1997Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard, Ronald R. Stephenson
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Patent number: 5594089Abstract: Thermomechanical and thermo-oxidative stabilities in heterocycle or heterocycle sulfone resin composites are improved by forming four crosslinks at each addition polymerization site in the backbone of the resin using crosslinking functionalities.Type: GrantFiled: October 21, 1994Date of Patent: January 14, 1997Assignee: The Boeing CompanyInventors: Hyman R. Lubowtiz, Clyde H. Sheppard