pH test elements

Details pH test elements pH test elements

Filed on

1997-03-18

Date issued

1999-04-27

Examiner

Alexander, Lyle A.

Patent Class

Chemical apparatus and process disinfecting, deodorizing, preser

SubClass

Analyzer, structured indicator, or manipulative laboratory...

SubSubClass

Calorimeter

Other Related Categories

422 58, 436163, 436 68, 436166, G01N 3352

Type

Patent

Status

active

Patent number

058978348

Description

ABSTRACT:
Tests for elevated pH and volatile amines in aqueous fluids are disclosed, including tests useful in the diagnosis of bacterial vaginosis and in other biological conditions. By using formulated indicators and indicators held in matrices that are permeable to gas but not to liquid, the tests provide clear and sharp transitions detectable by visual or machine-readable means rather than by subjective judgments such as small gradations in color or olfactory determinations. The tests lend themselves readily to iconic readouts of the test indications and to the inclusion of positive and negative controls.

REFERENCES:
patent: 3996006 (1976-12-01), Pagano
patent: 4174292 (1979-11-01), Seidenberger et al.
patent: 4194877 (1980-03-01), Peterson
patent: 4201548 (1980-05-01), Tamaoku et al.
patent: 4793977 (1988-12-01), Morris
patent: 4906249 (1990-03-01), Fogt et al.
patent: 4916056 (1990-04-01), Brown et al.
patent: 5217444 (1993-06-01), Schoenfeld
patent: 5425377 (1995-06-01), Caillouette

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