Patent application number | Description | Published |
20090024086 | Micro-steerable catheter - Micro-streerable catheters for use in delivering therapeutic treatment in the body, such as ablation and cauterization, and which exhibit precise movement are disclosed. Embodiments include electrical micro-catheters that comprise of electroactive polymers. A preferred embodiment includes a programmable catheter. | 01-22-2009 |
20090030152 | High Electric Energy Density Polymer Capacitors With Fast Discharge Speed and High Efficiency Based On Unique Poly (Vinylidene Fluoride) Copolymers and Terpolymers as Dielectric Materials - An improved charge or energy storage device having a dielectric charge or energy storage layer including:
| 01-29-2009 |
20100067172 | HIGH ELECTRIC ENERGY DENSITY POLYMERIC COMPOSITIONS, METHODS OF THE MANUFACTURE THEREFOR, AND ARTICLES COMPRISING THE SAME - Examples of the present invention relate generally to high electric energy density polymer film capacitors with high charge-discharge efficiency and fast discharge speed. For example, a high energy density polymer capacitor may be fabricated using a polymer blend comprising one or more high dielectric constant PVDF-based polymers (including homopolymers, copolymers and/or terpolymers) and one or more other polymer with low dielectric loss and high volume resistivity compared to the one or more PVDF-based polymers. An example film capacitor may comprise a high temperature fluoropolymer with dielectric loss lower than 0.2% and good film manufacturability. Polymer films can be stretched and orientated at least in one direction to make thinner films with improved performance. Film capacitors can be made by winding metallized films, plain films with metal foils, or using a hybrid construction where the dielectric films comprise the new compositions. Capacitors can also have a multilayer construction where the films are metallized. | 03-18-2010 |
20110016885 | REFRIGERATION DEVICES BASED ON POLAR-POLYMERS - Cooling devices (i.e., a heat exchanger) based on polymers which exhibits a temperature change upon application or removal of an electrical field or voltage are disclosed. Also disclosed are methods for cooling using such polymers. | 01-27-2011 |
20110038625 | ELECTROMECHANICAL POLYMER ACTUATORS - An adaptive lens comprises an actuator and a lens, the lens being mechanically coupled to the actuator so that energization of the actuator adjusts a focal point of the lens. The actuator may comprise a multilayer stack of electromechanical polymer (EMP) layers, having electrodes configured to apply an electric field across each EMP layer. The actuator may be operable to move and/or deform a lens, so as to adjust the focus properties of the lens. In some examples, the actuator has an annular shape, supporting a lens within the inner radius of the annulus. The lens position may be adjusted in an axial direction. In other examples, the actuator may be mechanically coupled a surface of a deformable lens, either directly or through another element of a lens structure. A strain applied to the lens modifies a curved surface of the lens, hence modifying the focal length of the lens. | 02-17-2011 |
20110110015 | Methods to improve the efficiency and reduce the energy losses in high energy density capacitor films and articles comprising the same - A multilayer film useful for capacitive applications comprises a high energy density layer and a dielectric blocking layer. In some embodiments, a conducting film is located between the high energy density layer and the blocking layer. The high energy density layer may be a fluoropolymer, such as a polymer or copolymer of poly-1,1-difluoroethene or a derivative thereof. The multilayer film may have high energy density (for example,. >8 J/cm | 05-12-2011 |
20110228442 | CAPACITOR HAVING HIGH TEMPERATURE STABILITY, HIGH DIELECTRIC CONSTANT, LOW DIELECTRIC LOSS, AND LOW LEAKAGE CURRENT - Examples of the present invention include high electric energy density polymer film capacitors with high dielectric constant, low dielectric dissipation tangent, and low leakage current in a broad temperature range. More particularly, examples include a polymer film capacitor in which the dielectric layer comprise a copolymer of a first monomer (such as tetrafluoroethylene) and a second polar monomer. The second monomer component may be selected from vinylidene fluoride, trifluoroethylene or their mixtures, and optionally other monomers may be included to adjust the mechanical performance. The capacitors can be made by winding metallized films, plain films with metal foils, or hybrid construction where the films comprise the new compositions. The capacitors can be used in DC bus capacitors and energy storage capacitors in pulsed power systems. | 09-22-2011 |
20120178880 | POLYMER BLENDS ELECTROSTRICTIVE TERPOLYMER WITH OTHER POLYMERS - Polymer blends having improved electromechanical responses and mechanical properties for use in electromechanical application are disclosed. In particular, polymer blend including at least one electrostrictive terpolymer, e.g., poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) or a derivative thereof, and at least one fluoropolymer, e.g., PVDF or derivative thereof such as PVD-TrFE are disclosed. The polymer blends advantageously have a transverse strain, i.e., a strain perpendicular to the applied electric field direction, that is about 1.5% or higher (as measured at 100 MV/m) while also having an elastic modulus of no less than about 400 MPa (as measured at 30° C. and 1 Hz by dynamic mechanical analyzer). | 07-12-2012 |
20120239032 | MICRO-STEERABLE CATHETER - Micro-streerable catheters for use in delivering therapeutic treatment in the body, such as ablation and cauterization, and which exhibit precise movement are disclosed. Embodiments include electrical micro-catheters that comprise of electroactive polymers. A preferred embodiment includes a programmable catheter. | 09-20-2012 |
20150027132 | COOLING DEVICE INCLUDING AN ELECTROCALORIC COMPOSITE - Cooling devices, heat pumps, and climate controlling devices employing an electrocaloric composite of high thermal conductivity and significant electrocaloric effect are disclosed. The electrocaloric composites include a combination of one or more EC-fluoropolymers and their blends with one or more electric-insulating fillers of high thermal conductivity. | 01-29-2015 |
20150033762 | REGENERATIVE ELECTROCALORIC COOLING DEVICE - A regenerative electrocaloric (EC) device is provided. The regenerative EC device uses a special configuration to expand the temperature span T | 02-05-2015 |