The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2015
Filed:
Jun. 15, 2011
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);
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);
3M Innovative Properties Company, St. Paul, MN (US);
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.