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公开(公告)号：US20250151204A1
公开(公告)日：2025-05-08
申请号：US18936456
申请日：2024-11-04
Applicant: Worcester Polytechnic Institute
Inventor： Pratap Rao , Ritwik Pandey , Ceren Yilmaz Akkaya , Markus P. Nemitz , Cem Aygul
Abstract: A surface treatment of a printed trace improves electrical conductivity at a contact area defining an insertion or engagement of a circuit element. Mechanical and chemical treatment at a contact area of an extruded trace generated from 3-dimensional (3D) printing techniques mitigates resistance of the surface. A conductive trace may be extruded from a conductive filament material including conductive granules, flakes or powder. A solvent or etchant applied to the extruded surface at the contact point removes, dissolves or otherwise abrades the contact area. A mechanical drilling or incision may also be applied. Dissolution of the non-conductive material exposes the conductive material for improved contact with a conductive epoxy or paste applied to the contact area for receiving a conductive terminal (pin or pad) from a circuit element.
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公开(公告)号：US20220236484A1
公开(公告)日：2022-07-28
申请号：US17584745
申请日：2022-01-26
Applicant: Worcester Polytechnic Institute
Inventor： Yuxiang Liu , Pratap Rao , Yundong Ren , Mucheng Li
Abstract: A fiber optic sensing device includes an optical fiber having a polished end defining a flat sensory portion coated with a lossy-mode-resonance (LMR) coating. A reflective coating on an end face of the optical fiber facilitates propagation of a return signal. An optic circuit for identifies a wavelength attenuated by the LMR coating from the return signal reflected by the reflective coating based on a moisture presence at the sensory portion. Various gaseous parameters may be detected based on the coating on the sensory portion. An LMR coating of tin oxide (SnO2) is employed for moisture sensing.
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公开(公告)号：US20190134664A1
公开(公告)日：2019-05-09
申请号：US16000154
申请日：2018-06-05
Applicant: Worcester Polytechnic Institute
Inventor： Pratap Rao
Abstract: A superhydrophobic surface is formed by growing a plurality of etchable, sacrificial structures, and depositing a discontinuous hydrophobic material onto the sacrificial structures. The discontinuity facilitates etching of the sacrificial structures to remove the grown structures while leaving the deposited material intact to result in surface features for achieving superior hydrophobic properties.
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Patent Agency Ranking
公开(公告)号：US20240372112A1
公开(公告)日：2024-11-07
申请号：US18654330
申请日：2024-05-03
Applicant: Worcester Polytechnic Institute
Inventor： Andrew R. Teixeira , Ravindra Datta , Pratap Rao , Ari Athair , Cameron Armstrong , Muntasir Shahabuddin
IPC: H01M4/90 , H01M4/86 , H01M8/18 , H01M50/497
Abstract: A low temperature, liquid metal approach provides a metal-air battery at room temperature or slightly above for high current density, using ambient oxygen as an electrode without the need for high heat for an opposed metal electrode. A metal-air battery employs a low melting point metal such as gallium for an all-fluid battery having a flowing aqueous electrolyte for maintaining a large volume of electrical storage capacity separate form a relatively small reactor or cell for powering an electrical load. Reversibility of the forward discharge (load powering) reaction provides a recharging capability well suited for grid storage to moderate supply and demand variations. The result is an ultra-high density, rechargeable, safe, grid-scale electricity storage technology as an alternative to lithium-ion and solvent-based flow batteries.
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公开(公告)号：US10953432B2
公开(公告)日：2021-03-23
申请号：US16000154
申请日：2018-06-05
Applicant: Worcester Polytechnic Institute
Inventor： Pratap Rao
Abstract: A superhydrophobic surface is formed by growing a plurality of etchable, sacrificial structures, and depositing a discontinuous hydrophobic material onto the sacrificial structures. The discontinuity facilitates etching of the sacrificial structures to remove the grown structures while leaving the deposited material intact to result in surface features for achieving superior hydrophobic properties.
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公开(公告)号：US20250164327A1
公开(公告)日：2025-05-22
申请号：US18955546
申请日：2024-11-21
Applicant: Worcester Polytechnic Institute
Inventor： Pratap Rao , Ritwik Pandey , Markus P. Nemitz
Abstract: A flexible sensor invokes a fluid sensing medium in an encapsulation for detecting pressure based on movement of the fluid in the flexible encapsulation. The fluid sensing medium is a conductive liquid which exhibits a varied resistance to changes in a cross section resulting from deformation of the flexible encapsulation. A flexible substrate with a fused planar material adheres around the fluid sensing medium. The fluid sensing medium maty be deposited or placed by an extrusion or print nozzle, a screen or other selective application. A deposited bead or run of the fluid sensing medium has a viscosity for holding a shape until the flexible planar material is adhered. A narrow, elongated and patterned or curved run provides a length of encapsulated fluid which is responsive to deformation from pressure. Insertion of electrical leads at opposed ends of the run provides a measurable electrical resistance that varies with fluid movement.
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公开(公告)号：US20250013145A1
公开(公告)日：2025-01-09
申请号：US17971393
申请日：2022-10-21
Applicant: Worcester Polytechnic Institute
Inventor： Pratap Rao , John S. Berg , Maryam M. Shalmani
Abstract: Nanoimprint lithography forms a microfeature array on a substrate responsive to inkjet printing techniques for high resolution printing of circuit elements and other features with highly accurate fidelity to predetermined boundaries. The microfeature array is defined by micropillars formed between intersecting microchannels in the substrate. The micropillars are responsive to a sequence of ink droplets in a highly controlled and predictable manner based on the droplet volume, droplet spacing and temperature. The flow of liquid ink is restrained by the micropillars for pinning the ink for avoiding uncontrolled ink flow as occurs on a flat surface. Subsequent layers of deposited ink tend to follow pining of previous layers, allowing an iterative buildup of layers for forming a trace of sufficient thickness and a high aspect ratio allowing traces extending above the depth of the microchannels for aiding communication with surface mount components.
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公开(公告)号：US11668873B2
公开(公告)日：2023-06-06
申请号：US17584745
申请日：2022-01-26
Applicant: Worcester Polytechnic Institute
Inventor： Yuxiang Liu , Pratap Rao , Yundong Ren , Mucheng Li
CPC classification number: G02B6/12007 , G02B6/021 , G02B6/3512 , G02B6/4214
Abstract: A fiber optic sensing device includes an optical fiber having a polished end defining a flat sensory portion coated with a lossy-mode-resonance (LMR) coating. A reflective coating on an end face of the optical fiber facilitates propagation of a return signal. An optic circuit for identifies a wavelength attenuated by the LMR coating from the return signal reflected by the reflective coating based on a moisture presence at the sensory portion. Various gaseous parameters may be detected based on the coating on the sensory portion. An LMR coating of tin oxide (SnO2) is employed for moisture sensing.
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