L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

American Air Liquide, Inc.

Airgas, Inc.

Mani C Matthew

Tracey Jacksier

Vincent M Omarjee

Anthony W Reccek, Jr

Martin Vasarhelyi

Megumi Isaji

James McHALE

Richard A Socki

Jun Sonobe

James L Mchale

A quality control method for the preparation of dry compressed gas cylinder including passivating and/or preparing the compressed gas cylinder with the technique to be validated, filling the passivated/prepared compressed gas cylinder with gaseous carbon dioxide to a normal working pressure, wherein the gaseous carbon dioxide has a known δO isotope ratio, maintaining the pressurized gas cylinder at ambient temperature for a first predetermined period of time, and gradually emptying the pressurized gas cylinder, while simultaneously measuring the δO isotopic ratio, wherein a predetermined variation in the measured isotopic ratio of δO indicates a properly prepared cylinder.

Use of stable isotopes of COto validate cylinder preparation

The disclosure relates to a manufactured composition, material or device comprising at least two different nonradioactive isotope atoms. Each nonradioactive isotope atom is present in an amount sufficient to increase the total amount of the nonradioactive isotope atom above the total amount found in the manufactured composition, material or device in the absence of adding the nonradioactive isotope atom to increase said total amount. The ratio(s) of the at least two nonradioactive isotopes in the manufactured composition, material or device are measurably different than the ratio(s) found in the manufactured composition, material or device in the absence of adding the nonradioactive isotope atom to increase said total amount.

Use of stable isotopes to prove authentication of manufacturing location

Growing community of inventors

Neshanic Station, NJ, United States of America

Mani C Matthew