# US 5,011,290 A · Test sample color comparison device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,011,290 A
- Document ID: US5011290A
- Status: Granted
- Kind: A
- Application number: 07/567,699
- Filed: 1990-08-14
- Granted: 1991-04-30
- Earliest claimed: 1987-11-08
- Inventors: Takao Terada; Hiroyuki Ota; Shigeru Makita; Bernd G. Herpichboehm; George H. Sierra; Robert B. Summers; Thomas M. Watlington
- Web page: https://patentgrep.com/patent/US5011290A

## CPC

- G01N 21/293: {with colour charts, graduated scales or turrets}
- G01N 21/8483: {Investigating reagent band (test-element handling not specific to a test method G01N33/4875; analytical elements specific to chemical analysis of biological material G01N33/52; autometer with reagent band G01N35/04)}
- G01J 3/522: {circular colour charts}
- G01N 2021/0181: {Memory or computer-assisted visual determination}
- 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 test sample color comparison device is disclosed which has a casing unit with an insertion slot for inserting a color test sample therein, and a display section for displaying the color test sample adjacent at least one of a plurality of reference color shades, as the reference color shades are successively moved into position adjacent the color test sample by a manipulation wheel. When an operator determines that a reference color shade adjacent the test sample corresponds in color to the color of the test sample, he pushes a switch to cause a readout of stored information corresponding to the reference color shade then adjacent the test sample. Readout of the stored information is based on a bit pattern set by a plurality of converter switches which are turned on and off in different patterns which correspond to the different color shades as the reference color shades are moved into position by the manipulation wheel. An uneven pattern code section moves in association with the manipulatable wheel and actuates the converter switches. A preferred uneven pattern code section is arranged so that all of the converter switches are actuated roughly equally during a full rotation of the manipulatable wheel, and so that only one of the converter switches is switched on or off during incremental movement of the manipulable wheel.

## Claims

### Claim 1

A test sample color comparison device comprising:
a casing unit having an insertion slot for receiving a color test sample, and a display section for viewably displaying a color test sample inserted in said slot along with a succession of reference color shades;
a manipulable member mounted so that it can be moved and having an upper portion;
a comparative color test sample section having said succession of reference shades positioned in a pattern, said color test sample section being located on said upper portion of said manipulable member, said succession of reference color shades being successively moved into a viewable position adjacent said color test sample in said display section upon movement of said manipulable member to thereby permit a visual comparison of said reference color shades with a color of said color test sample through said display section;
switch means for converting the position of said manipulable member into an electrical signal representing a position of said comparative color test sample section relative to said color test sample;
an uneven patterned code section movable with movement of said manipulable member for operating said switch means; and,
a display means for displaying a designated color shade significance corresponding to the relative position of said comparative color test sample section to said color test sample in accordance with said electrical signal.

### Claim 2 (depends on 1)

A test sample color comparison device as in claim 1 wherein said manipulable member is movable in incremental stages.

### Claim 3 (depends on 1)

A test sample color comparison device as in claim 1 wherein said display section is formed as a first display window in said casing and said casing further comprises a second display window through which said display means displays said color shade significance.

### Claim 4 (depends on 1)

A test sample color comparison device as in claim 1 wherein said casing further comprises a stopper for limiting the insertion distance of said color test sample into said insertion slot.