David E Read

US Patent:

6790411, Sep 14, 2004

Filed:

Dec 2, 1999

Appl. No.:

09/453726

Inventors:

David M. Read - White Bear Lake MN

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

A61L 900

US Classification:

422 28, 422 32, 422 55, 422 57, 422 83, 422 86, 422123, 422305, 436 1, 436 2, 436135, 436164, 436169, 206438, 206439, 2064591, 2524081

Abstract:

The present invention provides a hydrogen peroxide indicator that includes a substrate on which is disposed an indicator composition that includes at least one of a select group of colorants. As a result of contact with hydrogen peroxide, the colorants change color, and even become colorless, thereby providing an indication of the presence of hydrogen peroxide.

US Patent:

7192554, Mar 20, 2007

Filed:

Dec 31, 2001

Appl. No.:

10/037435

Inventors:

David M. Read - White Bear Lake MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

A61L 2/00
A61L 9/00

US Classification:

422 28, 422 58, 422 61, 422 83, 422123, 422 86, 436135, 436166

Abstract:

The present invention provides a hydrogen peroxide indicator and a peracetic acid indicator that include a substrate on which is disposed an indicator composition that includes at least one of a select group of colorants and a transition metal salt. As a result of exposure to hydrogen peroxide and/or peracetic acid, the colorants change color, and even become colorless, thereby providing an indication of the presence of hydrogen peroxide and/or peracetic acid.

US Patent:

7481975, Jan 27, 2009

Filed:

Jul 14, 2004

Appl. No.:

10/890612

Inventors:

David M. Read - White Bear Lake MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

A61L 9/00
G01N 21/00
G01N 31/00
G01N 33/00
G01N 21/77
G01J 1/48
A62B 7/08
A61B 17/06
B65D 85/00
C12Q 1/22
C12Q 1/02
C12N 11/02

US Classification:

422 57, 422 1, 422 4, 422 5, 422 28, 422 32, 422 34, 422 83, 422 87, 422119, 422123, 422292, 422300, 422305, 422306, 422307, 436 1, 436 2, 436135, 436169, 206438, 206439, 2064591, 2524081, 435 29, 435 31, 435177, 523161

Abstract:

The present invention provides a hydrogen peroxide indicator that includes a substrate on which is disposed an indicator composition that includes at least one of a select group of colorants. As a result of contact with hydrogen peroxide, the colorants change color, and even become colorless, thereby providing an indication of the presence of hydrogen peroxide.

US Patent:

7670552, Mar 2, 2010

Filed:

Jan 18, 2007

Appl. No.:

11/655022

Inventors:

David M. Read - White Bear Lake MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

G01N 31/22

US Classification:

422 56, 422 86, 436 1, 436135, 436166

Abstract:

The present invention provides a hydrogen peroxide indicator and a peracetic acid indicator that include a substrate on which is disposed an indicator composition that includes at least one of a select group of colorants and a transition metal salt. As a result of exposure to hydrogen peroxide and/or peracetic acid, the colorants change color, and even become colorless, thereby providing an indication of the presence of hydrogen peroxide and/or peracetic acid.

US Patent:

7897403, Mar 1, 2011

Filed:

Jan 26, 2010

Appl. No.:

12/693553

Inventors:

David M. Read - White Bear Lake MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

A61L 2/00

US Classification:

436135, 436166, 422 83, 422123

Abstract:

The present invention provides a hydrogen peroxide indicator and a peracetic acid indicator that include a substrate on which is disposed an indicator composition that includes at least one of a select group of colorants and a transition metal salt. As a result of exposure to hydrogen peroxide and/or peracetic acid, the colorants change color, and even become colorless, thereby providing an indication of the presence of hydrogen peroxide and/or peracetic acid.

US Patent:

20090129977, May 21, 2009

Filed:

Jan 26, 2009

Appl. No.:

12/359783

Inventors:

David M. Read - White Bear Lake MN, US

International Classification:

G01N 33/00

US Classification:

422 57

Abstract:

The present invention provides a hydrogen peroxide indicator that includes a substrate on which is disposed an indicator composition that includes at least one of a select group of colorants. As a result of contact with hydrogen peroxide, the colorants change color, and even become colorless, thereby providing an indication of the presence of hydrogen peroxide.

US Patent:

20110275159, Nov 10, 2011

Filed:

Dec 30, 2009

Appl. No.:

13/142752

Inventors:

Kevin D. Landgrebe - Woodbury MN, US
David M. Read - White Bear Lake MN, US
Steven S. Kirckof - Woodbury MN, US

Assignee:

3M INNOVATIVE PROPERTIES COMPANY - St. Paul MN

International Classification:

G01N 21/78
B32B 33/00
B32B 29/00

US Classification:

436 1, 4285377

Abstract:

A chemical indicator composition comprising a bismuth (III) compound selected from the group consisting of bismuth (III) oxide and a bismuth (III) compound comprising at least one organic group which includes 2 to 20 carbon atoms; elemental sulfur; and a compound which makes the composition alkaline when exposed to water vapor at an elevated temperature; a chemical indicator composition comprising a bismuth (III) compound; elemental sulfur; a compound which makes the composition alkaline when exposed to water vapor at an elevated temperature; and at least one acid other than any acid present in the bismuth (III) compound; a chemical indicator comprising a substrate and the composition coated on at least a portion of a major surface of the substrate; methods of making the chemical indicator; and methods of using the chemical indicator are disclosed.

US Patent:

20110312096, Dec 22, 2011

Filed:

Jun 15, 2011

Appl. No.:

13/161079

Inventors:

David A. Whitman - St. Paul MN, US
David M. Read - White Bear Lake MN, US
Ranjani V. Parthasarathy - Woodbury MN, US
Kevin D. Landgrebe - Woodbury MN, US
Anthony E. Bennett - Maplewood MN, US

International Classification:

G01N 21/77
G01N 21/78

US Classification:

436 1

Abstract:

Chemical indicator compositions comprising a bismuth compound; elemental sulfur; and a compound with relatively high water solubility which makes the composition alkaline when exposed to water vapor at an elevated temperature; a chemical indicator comprising a substrate and the composition coated on at least a portion of a major surface of the substrate; and methods of making and using the chemical indicator are disclosed.