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:
Sep. 16, 1997
Filed:
Oct. 24, 1994
Mark K Debe, Stillwater, MN (US);
Lowell R Miller, White Bear Lake, MN (US);
Edward E Parsonage, Minneapolis, MN (US);
Richard J Poirier, White Bear Lake, MN (US);
Gregory Yuschak, Hudson, WI (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
An exposure indicating apparatus and indicating method includes a sensor having a property responsive to a concentration of a target species. A processing device generates a concentration signal as a function of the property and an indicator is activated as a function of the concentration signal. The indicator is activated at a signaling rate indicative of an exposure indicating apparatus operating within predefined design parameters and at an exposure signaling rate indicative of the concentration attaining a predetermined threshold concentration. The indicator may also be activated at a signaling rate indicative of an exposure indicating apparatus operating outside of the predefined design parameters, and after the predetermined threshold concentration is attained, the indicator may be activated at an exposure signaling rate which varies as a function of the concentration signal.