Joseph Allen Potkay

US Patent:

7192001, Mar 20, 2007

Filed:

May 10, 2004

Appl. No.:

10/842665

Inventors:

Kensall D. Wise - Ann Arbor MI, US
Joseph A. Potkay - Ann Arbor MI, US

Assignee:

The Regents of the University of Michigan Office of Technology Transfer - Ann Arbor MI

International Classification:

F16K 31/00

US Classification:

251 11, 251 612, 251111, 25112901, 251331

Abstract:

A microvalve device includes a semiconductor-based valve housing that defines a flow passage, and a valve face disposed within the valve housing and in fluid communication with the flow passage. The microvalve device further includes a thermal expansion actuator that drives movement of the valve face from a first position to a second position relative to the flow passage, and a capacitor that holds the valve face in the second position. The microvalve may also include an insulating layer disposed on portions of the semiconductor-based valve housing, and a capacitance sensor for monitoring a capacitance level to determine when the valve face reaches the second position. Once the sensor indicates that the second position has been reached, power is no longer applied to the thermal expansion actuator such that power is only substantially consumed during the transition from the first position to the second position. The thermal expansion actuator may include a heating element and a thermal expansion substance for thermopneumatic displacement of the valve face.

US Patent:

20030233862, Dec 25, 2003

Filed:

May 13, 2003

Appl. No.:

10/437101

Inventors:

Kensall Wise - Ann Arbor MI, US
Richard Sacks - Ann Arbor MI, US
Katharine Beach - Ann Arbor MI, US
Joseph Potkay - Bay Village OH, US
Masoud Agah - Ann Arbor MI, US

International Classification:

G01N030/60

US Classification:

073/023390, 096/104000, 219/209000

Abstract:

A high-sensitivity, separation microcolumn assembly for a microgas chromatograph and the like is provided. The assembly has an ultra-low mass complete with integrated heaters. The assembly uses multiple zones for temperature control, and microstructures that permit very rapid heating and cooling of the microcolumn.

US Patent:

20040255643, Dec 23, 2004

Filed:

Jun 4, 2004

Appl. No.:

10/861036

Inventors:

Kensall Wise - Ann Arbor MI, US
Richard Sacks - Ann Arbor MI, US
Joseph Potkay - Bay Village OH, US
Masoud Agah - Ann Arbor MI, US

International Classification:

G01N030/02

US Classification:

073/023390

Abstract:

A high-performance separation microcolumn assembly and method for making such an assembly are provided. The assembly includes high-performance Si-glass GC separation columns having integrated heaters and temperatures sensors for temperature programming and integrated pressure sensors for flow control. These columns, integrated on a die, are fabricated using a silicon-on-glass dissolved-wafer-process. The TCR of the temperature sensors and the sensitivity of the pressure sensors satisfy the requirements needed to achieve reproducible separations in a GC system. Using these columns, highly-resolved multiple-component separations were obtained with analysis times a factor of two faster than isothermal responses.

US Patent:

20100298720, Nov 25, 2010

Filed:

Apr 16, 2010

Appl. No.:

12/762242

Inventors:

Joseph Allen POTKAY - Sheffield Village OH, US

International Classification:

A61N 1/378
A61B 5/021
A61B 5/026
A61B 5/01

US Classification:

600485, 607 35, 607 5, 600505, 600549

Abstract:

This invention concerns miniature implantable power sources that harvest or scavenge energy from the expansion and contraction of biological tissues, for example, an artery or a bundle of muscle fiber. Such power sources employ an energy harvesting element that converts mechanical or thermal energy existing or generated in or from a pulsatile tissue into a form of electrical energy that can be used or stored by an implanted medical device, such as a blood pressure sensor, a flow meter, or the like. Preferred energy harvesting element embodiments utilize a piezoelectric thin film embedded within a flexible, self-curling medical-grade polymer or coating. Such power sources can be used to produce self-powered implanted microsystems with continuous or near-continuous operation, increased lifetimes, reduced need for surgical replacement, and minimized or eliminated external interface requirements.

US Patent:

20220323005, Oct 13, 2022

Filed:

Jun 24, 2020

Appl. No.:

16/910740

Inventors:

- Cleveland OH, US
Jeremy Dunning - Cleveland Heights OH, US
Katherine M. Bogie - Cleveland OH, US
Joseph A. Potkay - Plymouth MI, US

International Classification:

A61B 5/00
A61B 5/024
A61B 5/021
A61B 5/026
G01L 9/00

Abstract:

A sensor apparatus includes at least one substrate layer of an elastically deformable material, the substrate layer extending longitudinally between spaced apart ends thereof. A conductive layer is attached to and extends longitudinally between the spaced apart ends of the at least one substrate layer. The conductive layer includes an electrically conductive material adapted to form a strain gauge having an electrical resistance that varies based on deformation of the conductive layer in at least one direction.

US Patent:

20230084914, Mar 16, 2023

Filed:

Nov 10, 2022

Appl. No.:

17/984408

Inventors:

- Washington DC, US
Joseph A. Potkay - Ann Arbor MI, US

International Classification:

A61M 1/16
B01D 63/00
B01D 69/12
B01D 69/02
B01D 69/04
B01D 63/06

Abstract:

Disclosed herein are rolled-membrane microfluidic diffusion devices and corresponding methods of manufacture. Also disclosed herein are three-dimensionally printed microfluidic devices and corresponding methods of manufacture. Optionally, the disclosed microfluidic devices can function as artificial lung devices.

US Patent:

20200232954, Jul 23, 2020

Filed:

Jan 18, 2019

Appl. No.:

16/252081

Inventors:

- Ann Arbor MI, US
Changhua ZHAN - Ann Arbor MI, US
Robert W. HOWER - Ann Arbor MI, US
Joseph A. POTKAY - Plymouth MI, US

International Classification:

G01N 30/60
G01N 30/30

Abstract:

A microscale collector and injector device comprises a microscale passive pre-concentrator (μPP) and a microscale progressively-heated injector (μPHI). The μPP devices comprises first and second substrate portions, a first collection material, a μPP heater, and an outlet. The first substrate portion defines an array of microscale diffusion channels. The first and second substrate portions cooperate to define a first compartment in fluid communication with the diffusion channels. The first collection material is disposed within the first compartment, at least partially surrounding the outlet. The μPP heater is disposed in thermal communication with the second substrate portion. The μPHI device comprises third and fourth substrate portions, a second collection material, and a plurality of μPHI heaters. The third and fourth substrate portions cooperate to define a second compartment. The second collection material is disposed within the second compartment. The μPHI heaters are disposed in thermal communication with the second compartment.

US Patent:

20200061271, Feb 27, 2020

Filed:

Apr 3, 2018

Appl. No.:

16/499999

Inventors:

- Washington DC, US
Joseph A. Potkay - Ann Arbor MI, US

International Classification:

A61M 1/16
B01D 63/00
B01D 69/12

Abstract:

Disclosed herein are rolled-membrane microfluidic diffusion devices and corresponding methods of manufacture. Also disclosed herein are three-dimensionally printed microfluidic devices and corresponding methods of manufacture. Optionally, the disclosed microfluidic devices can function as artificial lung devices.