Patent · US Expired

Noise checking method

US4421857A · kind A · utility

3Cited by
1References
10Claims
0Family size

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Key dates

Filing dateDec 15, 1981
Grant dateDec 20, 1983
Priority date—
Expiry dateDec 15, 2001

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10T436/173076
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A method for checking noise of a spectrometer or spectrophotometer. The method is of the type comprising measuring absorbance (A) or percent transmittance (%T) of a solution over a period of time. The method is characterized in that the solution comprises from about 0.040 to about 0.090 M nitrite, the nitrite being present as a nitrite ionized constituent.

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