Patent · US Expired

Analytical element having improved spreading zone and method of use

US4547465A · kind A · utility

7Cited by
7References
20Claims
0Family size

Assignee

Inventor

Key dates

Filing dateApr 16, 1984
Grant dateOct 15, 1985
Priority date—
Expiry dateApr 16, 2004

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10S435/805
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A dry element capable of use for the analysis or transport of liquids comprises an isotropically porous zone which comprises a blush polymer having dispersed therein a particulate material and a nonpolymeric heterocyclic, aliphatic or carbocyclic quaternary ammonium compound comprising at least 12 carbon atoms therein. This compound is present in the porous zone in an amount of at least about 2 weight percent, based on the dry weight of the blush polymer. The porous zone of this element has improved cohesive strength which improves its resistance to abrasion. The element can be used to determine an analyte in an aqueous liquid, such as biological fluids.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.