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:
Apr. 02, 2019
Filed:
Feb. 27, 2014
Insignia Technologies Ltd, Newhouse, GB;
Insignia Technologies LTD, Newhouse, GB;
Abstract
There is described an indicator device for indicating the passage of time, the indicator device comprising an indicator section and a barrier section adjacent thereto, said indicator section comprising: an indicator material; a substrate material; and a first adhesive layer; the indicator material and the substrate material being in the form of one or more layers; the indicator material displaying different visible properties in response to the presence or absence of a chemical agent and/or the concentration thereof; the barrier section comprising a removable barrier layer, the removable barrier layer being substantially impermeable to the chemical agent; wherein on removal of the removable barrier layer, the concentration of the chemical agent in the indicator section changes over time, effecting a visible change. The device may be used to detect the presence/absence of oxygen, water, carbon dioxide, an amine, ammonia, and/or carboxylic acids or to indicate the passage of time.