# US 11,442,011 B2 · Fluorescent standard strip

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- Number: US 11,442,011 B2
- Document ID: US11442011B2
- Status: Granted
- Kind: B2
- Application number: 17/259,232
- Filed: 2019-07-10
- Published: 2021-09-02
- Granted: 2022-09-13
- Earliest claimed: 2018-07-11
- Assignees: Sugentech, Inc.
- Applicants: Sugentech, Inc.
- Inventors: Sungrak Kim; Huije Lee; Hosung Sohn; Seungbum Yoo; Mi-Jin Sohn
- Web page: https://patentgrep.com/patent/US11442011B2

## CPC

- G01N 21/278: {Constitution of standards}
- G01N 21/64: Fluorescence; Phosphorescence
- G01J 3/4406: {Fluorescence spectrometry}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)

## Abstract

A fluorescent standard strip, according to the present invention, is for testing the reliability of the fluorescence intensity of a fluorescent strip used for an analyzer, the fluorescent standard strip having an effect whereby, for devices using a fluorescent substance, the inter-device deviation in fluorescence intensity is reduced, fluorescent signal linearity per fluorescent concentration level is secured, and device reliability may be tested by periodically checking faults, errors, deviations, etc. of the devices. In addition, the fluorescent standard strip, according to the present invention, has an effect whereby, even in an environment and state where light is frequently irradiated, the reduction of fluorescence intensity according to time may be minimized, i.e., the same level of fluorescence intensity may be maintained for a long period.

## Claims

### Claim 1

A fluorescent standard strip for testing a fluorescent strip used for an analysis device for reliability as to intensity of fluorescence, the fluorescent standard strip comprising:
a substrate;
a fluorescent layer stacked on the substrate and including a fluorescent substance; and
a masking layer stacked on the fluorescent layer to partially block fluorescence exposed to the outside from the fluorescent layer,
wherein an intensity of fluorescence for the fluorescent substance of the fluorescent standard strip is higher than that for a fluorescent substance of the fluorescent strip to be tested.

### Claim 2 (depends on 1)

The fluorescent standard strip of claim 1, wherein the fluorescent substance of the fluorescent standard strip has an emission wavelength falling within an emission wavelength range of the fluorescent substance used in the analysis device.

### Claim 3 (depends on 1)

The fluorescent standard strip of claim 1, wherein the fluorescent strip to be tested is tested for reliability as to intensity of fluorescence exposed to the outside therefrom, based on an intensity of the fluorescence exposed to the outside from the fluorescent standard strip.

### Claim 4 (depends on 1)

The fluorescent standard strip of claim 1, wherein the masking layer includes:
a light transmitting portion having a pattern formed to control a transmission of the fluorescence incident from the fluorescent layer to the masking layer, while allowing the fluorescence to be transmitted therethrough; and
a light blocking portion blocking the fluorescence,
wherein one or more light transmitting portions are formed, with the light blocking portion being a boundary therebetween.

### Claim 5 (depends on 4)

The fluorescent standard strip of claim 4, wherein the light transmitting portion includes a plurality of microstructures spaced apart from each other to form the pattern, such that the transmission of the fluorescence incident from the fluorescent layer is reduced.

### Claim 6 (depends on 5)

The fluorescent standard strip of claim 5, wherein the light transmitting portion includes a line pattern in which a plurality of lines continuing from one side to the other side of the masking layer are spaced apart from each other, and
the microstructures are located between the lines and the fluorescent layer, such that the transmittance of the fluorescence incident from the fluorescent layer to the light transmitting portion is reduced.

### Claim 7 (depends on 1)

A fluorescent analysis device set comprising:
the fluorescent standard strip of claim 1; and
a fluorescent analysis device.

### Claim 8 (depends on 1)

A method of testing a fluorescent strip for reliability using a fluorescent standard strip, the method comprising:
a) applying the fluorescent standard strip of claim 1 to the analysis device and measuring a fluorescence detection value; and
b) determining whether the fluorescence detection value falls within a required standard value range of the analysis device.

### Claim 9 (depends on 8)

The method of claim 8, further comprising c) comparing the fluorescence detection value and the required standard value of the analysis device for calculation and correcting an error for a deviation value of the analysis device.