Mrinal K Sengupta, Age 47519 Tamarack Dr APT 24, Union City, CA 94587

2011027, Nov 10, 2011

Apr 4, 2011

13/079746

Purnendu K. Dasgupta - Arlington TX, US
Mrinal K. Sengupta - Fremont CA, US

C25B 1/00
C25B 9/04
G01N 27/26

205335, 205775, 205477, 2042305, 204400

Embodiments of methods for electrochemical analysis of arsenic are described. In one embodiment, a method includes detecting arsenic (III) by, at least in part, applying electrolytic current to an arsenic compound that has not been reduced with a reducing agent. In another embodiment, a method for electrochemical analysis of arsenic includes detecting arsenic (V) by, at least in part, applying electrolytic current to an arsenic compound that has not been reduced with a reducing agent.

2021038, Dec 16, 2021

Aug 27, 2021

17/459757

- Sunnyvale CA, US
Mrinal Sengupta - Fremont CA, US
Yan Liu - Palo Alto CA, US
Christopher A. Pohl - Union City CA, US
Nebojsa Avdalovic - Cupertino CA, US

G01N 30/96
G01N 30/34

Systems and methods for inhibiting translocation of ions across ion exchange barriers include an eluent generator having an ion source reservoir with a first electrode, an eluent generation chamber with a second electrode, an ion exchange barrier disposed therebetween, and means for reversing the polarity of a voltage or current applied across the first and second electrodes. A first polarity voltage or current applied across the electrodes generates an electric field that promotes translocation of eluent counter ions from the reservoir across the barrier, where the counter ions combine with eluent ions electrolytically generated in the chamber. By reversing the polarity of the voltage or current across the electrodes, the resulting electric field inhibits translocation of counter ions across the barrier from the reservoir into the chamber. Reverse voltage or current bias reduces counter ion concentration in the resting chamber to prevent exhaustion of ion suppressor capacity during start up.

2018025, Sep 6, 2018

Mar 3, 2017

15/449868

- Sunnyvale CA, US
Mrinal SENGUPTA - Fremont CA, US
SM Rahmat ULLAH - Fremont CA, US

G01N 30/96
G01N 30/34
G01N 30/62

An in-line electrolytic reagent concentrator device that circumvents the need for additional pumps and supplies of reagents to support operation of a carbonate or ammonia removal device. The device generates regenerant solutions as strong as, or even stronger, than commercially recommended regenerant solutions. The device may also regenerate eluent solutions so as to reduce the frequency of eluent maintenance and replacement in ion chromatography systems.