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:
Jul. 12, 1977
Filed:
Jan. 02, 1976
David L Fuller, Atlanta, GA (US);
Other;
Abstract
A multiple laminae humidity sensing device for visually indicating changes in relative humidity including a moisture impermeable transparent support layer having a viewing side and a sensing side opposite said viewing side; an indicator layer with a plurality of filter cells, each including a transparent carrier material and an inorganic salt composition dispersed in the transparent carrier material that provides a known visible color response to changes in relative humidity on the sensing side of the support layer and a moisture permeable reflective layer behind the indicator layer so that light passing through the support layer and the indicator layer is reflected back through the indicator layer and the support layer through the viewing side of the support layer so as to be readily visible from the viewing side of the support layer.