Patents by Inventor Sina Ijadi-Maghsoodi
Sina Ijadi-Maghsoodi 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: 6214472Abstract: A method of joining similar or dissimilar ceramic and ceramic composite materials, such as SiC continuous fiber ceramic composites, at relatively low joining temperatures uses a solventless, three component bonding agent effective to promote mechanical bond toughness and elevated temperature strength to operating temperatures of approximately 1200 degrees C. The bonding agent comprises a preceramic precursor, an aluminum bearing powder, such as aluminum alloy powder, and mixtures of aluminum metal or alloy powders with another powder, and and boron powder in selected proportions. The bonding agent is disposed as an interlayer between similar or dissimilar ceramic or cermaic composite materials to be joined and is heated in ambient air or inert atmosphere to a temperature not exceeding about 1200 degrees C. to form a strong and tough bond joint between the materials.Type: GrantFiled: April 14, 1999Date of Patent: April 10, 2001Assignee: Iowa State University Research Foundation, Inc.Inventors: Thomas J. Barton, Iver E. Anderson, Sina Ijadi-Maghsoodi, Mohammad Nosrati, Ozer Unal
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Patent number: 5922628Abstract: A method of joining similar or dissimilar ceramic and ceramic composite materials, such as SiC continuous fiber ceramic composites, at relatively low joining temperatures uses a solventless, three component bonding agent effective to promote mechanical bond toughness and elevated temperature strength to operating temperatures of approximately 1200 degrees C. The bonding agent comprises a preceramic precursor, an aluminum bearing powder, such as aluminum alloy powder, and mixtures of aluminum metal or alloy powders with another powder, and and boron powder in selected proportions. The bonding agent is disposed as an interlayer between similar or dissimilar ceramic or ceramic composite materials to be joined and is heated in ambient air or inert atmosphere to a temperature not exceeding about 1200 degrees C. to form a strong and tough bond joint between the materials.Type: GrantFiled: February 23, 1998Date of Patent: July 13, 1999Assignee: Iowa State University Research Foundation, Inc.Inventors: Thomas J. Barton, Iver E. Anderson, Sina Ijadi-Maghsoodi, Mohammad Nosrati, Ozer Unal
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Patent number: 5858144Abstract: A method of joining similar or dissimilar ceramic and ceramic composite materials, such as SiC continuous fiber ceramic composites, at relatively low joining temperatures uses a solventless, three component bonding agent effective to promote mechanical bond toughness and elevated temperature strength to operating temperatures of approximately 1200 degrees C. The bonding agent comprises a preceramic precursor, an aluminum bearing powder, such as aluminum alloy powder, and mixtures of aluminum metal or alloy powders with another powder, and and boron powder in selected proportions. The bonding agent is disposed as an interlayer between similar or dissimilar ceramic or cermaic composite materials to be joined and is heated in ambient air or inert atmosphere to a temperature not exceeding about 1200 degrees C. to form a strong and tough bond joint between the materials.Type: GrantFiled: April 12, 1996Date of Patent: January 12, 1999Assignee: Iowa State University Research Foundation, Inc.Inventors: Thomas J. Barton, Iver E. Anderson, Sina Ijadi-Maghsoodi, Mohammad Nosrati, Ozer Unal
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Patent number: 5457074Abstract: The present invention provides linear organosilicon polymers including acetylene and vinylene moieties, and a process for their preparation. These diorganosilacetylene-alt-diorganosilvinylene linear polymers can be represented by the formula: --[--(R.sup.1)(R.sup.2)Si--C.tbd.C--(R.sup.3)(R.sup.4)Si--CH.dbd.CH--].sub .n --, wherein n.gtoreq.2; and each R.sup.1, R.sup.2, R.sup.3, and R.sup.4 is independently selected from the group consisting of hydrogen, halogen, alkyl, alkenyl, aryl, and aralkyl radicals. The polymers are soluble in organic solvents, air stable, and can be pulled into fibers or cast into films. They can be thermally converted into silicon carbide ceramic materials.Type: GrantFiled: February 28, 1994Date of Patent: October 10, 1995Assignee: Iowa State University Research Foundation, Inc.Inventors: Thomas J. Barton, Sina Ijadi-Maghsoodi, Yi Pang
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Patent number: 5312649Abstract: The present invention provides linear organosilicon polymers including acetylene and vinylene moieties, and a process for their preparation. These diorganosilacetylene-alt-diorganosilvinylene linear polymers can be represented by the formula: --[--(R.sup.1)(R.sup.2)Si--C.tbd.C--(R.sup.3)(R.sup.4)Si--CH=CH--].sub.n-- , wherein n.gtoreq.2; and each R.sup.1, R.sup.2, R.sup.3, and R.sup.4 is independently selected from the group consisting of hydrogen, halogen, alkyl, alkenyl, aryl, and aralkyl radicals. The polymers are soluble in organic solvents, air stable, and can be pulled into fibers or cast into films. They can be thermally converted into silicon carbide ceramic materials.Type: GrantFiled: June 8, 1993Date of Patent: May 17, 1994Assignee: Iowa State University Research Foundation, Inc.Inventors: Thomas J. Barton, Sina Ijadi-Maghsoodi, Yi Pang
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Patent number: 5254289Abstract: A polymeric material which exhibits nonlinear optical properties if undoped and conductive properties if doped. The polymer is prepared by polymerizing diethynylsilane compositions, the resulting polymeric material having a weight average molecular weight between about 20,000 and about 200,000 grams per mole. The polymer is prepared and catalytically polymerized by exposure to a catalyst, such as MoCl.sub.5 or W(CO).sub.6 /hv.Type: GrantFiled: May 4, 1992Date of Patent: October 19, 1993Assignee: Iowa State UniversityInventors: Thomas J. Barton, Sina Ijadi-Maghsoodi, Yi Pang
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Patent number: 5241029Abstract: The present invention provides linear organosilicon polymers including acetylene and vinylene moieties, and a process for their preparation. These diorganosilacetylenealt-diorganosilvinylene linear polymers can be represented by the formula: --[--(R.sup.1)(R.sup.2)Si--C.ident.C--(R.sup.3)(R.sup.4)Si--CH=CH--].sub.n --, wherein n.gtoreq.2; each R.sup.1, R.sup.2, R.sup.3, and R.sup.4 is independently selected from the group consisting of hydrogen, halogen, alkyl, alkenyl, aryl, and aralkyl radicals. The polymers are soluble in organic solvents, air stable, and can be pulled into fibers or cast into films. They can be thermally converted into silicon carbide ceramic materials.Type: GrantFiled: January 7, 1992Date of Patent: August 31, 1993Assignee: Iowa State University Research Foundation, Inc.Inventors: Thomas J. Barton, Sina Ijadi-Maghsoodi, Yi Pang
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Patent number: 5162478Abstract: Catalytic polymerization of dialkyl-, alkylaryl- or diaryldiethynylhydridosilanes cleanly affords soluble poly(silylene)vinylenes which can be shaped as fibers, films and bulk objects and thermally converted to silicon carbide.Type: GrantFiled: September 17, 1990Date of Patent: November 10, 1992Assignee: Iowa State University Research Foundation, Inc.Inventors: Thomas J. Barton, Sina Ijadi-Maghsoodi
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Patent number: 5115062Abstract: A polymeric material which exhibits nonlinear optical properties if undoped and conductive properties if doped. The polymer is prepared by polymerizing diethynylsilane compositions, the resulting polymeric material having a weight average molecular weight between about 20,000 and about 200,000 grams per mole. The polymer is prepared and catalytically polymerized by exposure to a catalyst, such as MoCl.sub.5 or W(CO).sub.6 /hv.Type: GrantFiled: October 9, 1990Date of Patent: May 19, 1992Assignee: Iowa State University Research Foundation, Inc.Inventors: Thomas J. Barton, Sina Ijadi-Maghsoodi, Yi Pang
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Patent number: 4965332Abstract: Organosilane polymers having recurring silylene-1,3-butadiyne and/or disilylene-1,3-butadiyne units are prepared in a one-pot synthesis from hexachlorobutadiene. Depending on the organic substituents (R and R'), these polymers have useful film-forming properties, and are converted to the ceramic, silicon carbide upon heating a very uniform high char yields. They can also be pulled into fibers. The polymers are thermally crosslinked above 100.degree. C.Type: GrantFiled: May 16, 1989Date of Patent: October 23, 1990Assignee: Iowa State University Research Foundation, Inc.Inventors: Thomas J. Barton, Sina Ijadi-Maghsoodi
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Patent number: 4940767Abstract: Organosilane polymers having recurring silyleneacetylene and/or disilyleneacetylene units are prepared in a one-pot synthesis from trichloroethylene. Depending on the organic substituents (R and R'), these polymers have useful film-forming properties, and are converted to the ceramic, silicon carbide upon heating in very uniform high yields. They can also be pulled into fibers.Type: GrantFiled: August 1, 1988Date of Patent: July 10, 1990Assignee: Iowa State University Research Foundation, Inc.Inventors: Thomas J. Barton, Sina Ijadi-Maghsoodi