A dehydration sensor having a stable, printable, buffered-ink composition that enables one to miniaturize the detection zone and permits both buffer and indicator dye to be applied in the same area of a detection zone, without need for a conventional, large buffer pad region. The ink composition includes a weak polymeric base as its primary buffering agent.

Claims

8 · 1 independent · depth 2

8 granted claims

›1.independentA dehydration sensor that consists essentially of:na porous substrate, with a buffered ink system that is directly deposited on a portion of said subs…+7

›2.↳ 1The dehydration sensor according to claim 1, wherein said weak polymeric base is: poly(allylamine), poly(ethyleneimine), poly(vinylamine hydrochloride…d2

›3.↳ 1The dehydration sensor according to claim 1, wherein said substrate is a polyester, cellulosic material, or rayon.d2

›4.↳ 1The dehydration sensor according to claim 1, wherein the buffered ink system is deposited in the same zone on said substrate as said pH-sensitive dye …d2

›5.↳ 1The dehydration sensor according to claim 1, wherein said buffered ink system is deposited in separate zones from said pH-sensitive dye.d2

›6.↳ 1The dehydration sensor according to claim 1, wherein said single active polymer is a polyvinyl alcohol or a polyethylene oxide.d2

›7.↳ 1The dehydration sensor according to claim 1, wherein said pH-sensitive dye exhibits a color transition at a pH from about 5.5 to about 10.5.d2

›8.↳ 1The dehydration sensor according to claim 1, wherein said pH-sensitive dye is one of the following: bromocresol green, bromothymol blue, nitrazine yel…d2

Classifications

4 codes

IPC · International Patent Classification

Section A — Human necessities

A61F13/15

USPC · US Patent Classification

604/361436/169600/362

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Pendency

3.4 y

1,238 days filing → grant

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after a restriction

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no RCE

Examiner

Lynne Anderson

art unit 3778 · TC 3700

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Citations: 34 back · 0 forward

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20120143159 A1	7 Jun 2012

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