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Full-Text Articles in Chemical Engineering
Electrode Modification Using An Unzippable Polymer Paste, Ravi F. Saraf
Electrode Modification Using An Unzippable Polymer Paste, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A paste is described for capping electrodes with an oxide free metal layer incorporating a solvent, an unzippable polymer and particles. The electrode could be an interconnect such as a C4 bump. A method for forming a coating and for testing integrated circuit chips is also described. The invention overcomes the problem of interconnecting Pb containing electrodes that are covered with an insulating oxide on integrated circuit chips by coating the Pb containing electrode with Au to provide an oxide free surface for testing and interconnection.
Radio Frequency (Rf) Transponder (Tag) With Composite Antenna, Ravi F. Saraf
Radio Frequency (Rf) Transponder (Tag) With Composite Antenna, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
An antenna composed of composite material which can be screen printed is proposed for RFID transponders and other RF communication systems.
Rfid Transponders With Paste Antennas And Flip-Chip Attachment, Ravi F. Saraf
Rfid Transponders With Paste Antennas And Flip-Chip Attachment, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A radio frequency transponder is provided which comprises a substrate layer, a radio frequency integrated circuit affixed to said substrate layer; and an antenna provided on said substrate layer in electrical connection with said radio frequency integrated circuit. The antenna is comprised of a conductive paste material having a resistivity of approximately 20 µΩ-cm, which is greater than the resistivity of a conventional etched copper antenna, but still sufficiently low to provide a radio frequency transponder having acceptable read range. The substrate layer further comprises a flexible organic material. The radio frequency integrated circuit is disposed in a flip-chip configuration …
Transgenic Non-Human Mammals Expressing Human Coagulation Factor Viii And Von Willebrand Factor , William H. Velander
Transgenic Non-Human Mammals Expressing Human Coagulation Factor Viii And Von Willebrand Factor , William H. Velander
Department of Chemical and Biomolecular Engineering: Patents
A non-human transgenic mammalian animal, as described above, contains an exogenous double stranded DNA sequence stably integrated into the genome of the animal, which comprises cis-acting regulatory units operably linked to a DNA sequence encoding human Factor VIII protein and a signal peptide, where the cis-acting regulatory units are active in mammary gland cells and the signal peptide is active in directing newly expressed Factor VIII into the milk of the animal. The promoter may be a milk protein promoter such as for whey acidic protein, casein, lactalbumin, or beta-lactoglobulin promoter. The transgenic mammals are preferably farm animals, for example, …
Electrode Modification Using An Unzippable Polymer Paste, Ravi F. Saraf
Electrode Modification Using An Unzippable Polymer Paste, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A paste is described for capping electrodes with an oxide free metal layer incorporating a solvent, an unzippable polymer and particles. The electrode could be an interconnect such as a C4 bump. A method for forming a coating and for testing integrated circuit chips is also described. The invention overcomes the problem of interconnecting Pb containing electrodes that are covered with an insulating oxide on integrated circuit chips by coating the Pb containing electrode with Au to provide an oxide free surface for testing and interconnection.
Ultra High Density Storage Media And Method Thereof, Ravi F. Saraf
Ultra High Density Storage Media And Method Thereof, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A storage media for storing information having a substrate. The substrate has an upper surface and a molecular weight greater than 5,000. Preferably the material is a polymer. The material has a plurality of piles of molecular chains in selected areas formed by pushing the molecular chains of the material on its upper surface to the selected area mechanically with a mechanical tool. The piles represent written information. The mechanical tool is preferably an atomic force microscope. Another aspect of the present invention is a method for storing information having the steps of selecting a material substrate having an upper …
Polycrystalline Conducting Polymers And Precursors Thereof Having Adjustable Morphology And Properties, Ravi F. Saraf
Polycrystalline Conducting Polymers And Precursors Thereof Having Adjustable Morphology And Properties, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
Polycrystalline materials containing crystallites of precursors to electrically conductive polymers and electrically conductive polymers are described which have an adjustable high degree of crystallinity. The intersticial regions between the crystallites contains amorphous material containing precursors to electrically conductive polymers and /or electrically conductive polymers. The degree of crystallinity is achieved by preparing the materials under conditions which provide a high degree of mobility to the polymer molecules permitting them to associate with one another to form a crystalline state. This is preferable achieved by including additives, such as plasticizers and diluents, to the solution from which the polycrystalline material is …
Lead Free Conductive Composites For Electrical Interconnections, Ravi F. Saraf
Lead Free Conductive Composites For Electrical Interconnections, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
An electrically conductive paste which includes a thermoplastic polymer, a conductive metal powder and an organic solvent system is disclosed. The invention further encompasses an electrically conductive composite which includes the aforementioned thermoplastic and metal, wherein the metal represents at least about 30% by volume, based on the total volume of the composite. The composite is formed from the paste under elevated temperature. The paste is employed in processes which involve electrically connecting electrical and electronic components under process conditions which convert the paste to the composite.
Immunosorbents With Developed Binding Efficiency And Method Of Manufacture , William H. Velander
Immunosorbents With Developed Binding Efficiency And Method Of Manufacture , William H. Velander
Department of Chemical and Biomolecular Engineering: Patents
The antitope of an antibody is masked with a masking agent, followed by immobilization on a support. The masking agent is then eluted to produce an improved immunosorbent, which is capable of binding more than double the amount of an antigen than existing immunosorbents having the same antibody bound at the same density. Preferably, the masking agent is an antigen or other compound having an epitope for which the antitope of the bound antibody has an avidity. In a preferred embodiment, greater than 30% of the bound antibodies maintain the same vicinity as when unbound for specific antigen or hapten …
Corrosion And Dissolution Protection Of A Conductive Silver/Polymer Composite, Ravi F. Saraf
Corrosion And Dissolution Protection Of A Conductive Silver/Polymer Composite, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A conductive composite is described containing silver particles and a polymer which covers each silver particle and wherein a heterocyclic organic compound containing nitrogen such as benzotriazole (BTA) is present to reduce Ag dissolution and ion mobility by forming a water insoluble complex with the Ag ion. The invention overcomes the problem of silver dissolution or corrosion a conductive composite as a result of normal high Ag ion mobility in the presence of moisture and an electric field
System And Process For Producing Biodiesel Fuel With Reduced Viscosity And A Cloud Point Below Thirty-Two (32) Degrees Fahrenheit, Hossein Noureddini
System And Process For Producing Biodiesel Fuel With Reduced Viscosity And A Cloud Point Below Thirty-Two (32) Degrees Fahrenheit, Hossein Noureddini
Department of Chemical and Biomolecular Engineering: Patents
Triglycerides are reacted in a liquid phase reaction with a homogeneous basic catalyst and alcohol, such as ethanol or methanol. The reaction yields a spatially separated two phase result with an upper located non-polar phase consisting principally of transesterified triglycerides and a lower located phase consisting principally of crude glycerol and residual transesterified triglycerides. The transesterified triglycerides and/or glycerol phase is/are optionally, each separately passed through strong cationic ion exchanger(s) to remove anions, resulting in neutral product(s). The crude glycerol is then flashed to remove alcohol and is reacted with an etherifying agent, such as isobutylene or isoamylene, in the …
Electrically Conductive Polymeric Materials And Use Thereof, Ravi F. Saraf
Electrically Conductive Polymeric Materials And Use Thereof, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
The present invention relates to electrically conductive polymer blend compositions comprising a non-conducting polymeric component and an electrically conducting polymeric component and specific applications to which the blend compositions can be put.