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

IPC: H05K3/10 ,  H05K3/04 ,  H05K3/06

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.

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

IPC: G01L1/22 ,  G01L5/00

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.