Disposable microbial profile tray

• US 4,245,052 A
• Filed: 06/29/1979
• Issued: 01/13/1981
• Est. Priority Date: 06/29/1979
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Lund, Marlys E.
• Primary Examiner(s): Warden, Robert J.
• Application Number:
  US06/053,437
• Time in Patent Office: 564 Days
• Field of Search: 422/102, 356/246, 435/301, 435/299, 435/300, 435/808
• US Class Current: 435/305.2
• CPC Class Codes: B01L 3/5085 for multiple samples, e.g. microtitration plates
• CPC Class Codes: C12M 23/12 Well or multiwell plates C12M25/04 takes precedence
• CPC Class Codes: C12M 23/20 Material Coatings immunocoatings C12M25/00
• CPC Class Codes: C12M 23/22 Transparent or translucent parts glassware for laboratory use B01L3/00
• CPC Class Codes: Y10S 435/808 Optical sensing apparatus

Abstract

A microbial profile tray formed of a light transmitting material and having a planar surface in which a plurality of uniformly shaped cup-like receptacles have their openings. Some of these cup-like receptacles have a surface which causes transmitted light to be diffused. The cup-like receptacles having the light diffusing surface can be used as control cups to simulate the turbidity which occurs in cups not having this light diffusing surface but in which microbial growth has occurred.

Claims

1. A microbial profile tray formed of a light-transmitting material and comprising a plurality of uniformly shaped cup-like receptacles having their openings integral with a planar surface, said cup-like receptacles having a lower end part, wherein some of said lower end parts have a surface finish which is smooth such that parallel light rays transmitted through said surfaces will continue to be generally parallel, and wherein some of said lower end parts have a light diffusing surface finish such that transmitted light will be diffused, and such that the diffusion due to said light diffusing surface finish will simulate the light diffusion which occurs when light is transmitted through a solution in which microbial growth has occured.

2. A microbial profile tray as claimed in claim 1 wherein said light diffusing surface finish of said lower end part is on the outer surface of said lower end part.

3. A microbial profile tray as claimed in claim 1 or 2 wherein said light diffusing surface finish comprises a roughened surface having an irregular profile through which transmitted light will be diffused.

4. A microbial profile tray as claimed in claim 3 wherein said array comprises matched pairs of smooth surfaced lower end parts and rough surfaced lower end parts such that microbes grown in said cup-like receptacles having smooth surfaced lower end parts will cause the diffusion of light being transmitted through said cup-like receptacle and the microbial growth therein, and such that said cup-like receptacles having rough surfaced lower end parts will cause the diffusion of light being transmitted through their irregular profile, thereby allowing comparison between said two different cup-like receptacles with light diffusion not being a variable.

5. A microbial profile tray as claimed in claim 1 wherein said cup-like receptacles are arranged in a rectangular array so as to afford identification of each cup-like receptacle.

6. A microbial profile tray as claimed in claim 5 wherein said array comprises matched pairs of smooth surfaced lower end parts and rough surfaced lower end parts such that microbes grown in said cup-like receptacles having smooth surfaced lower end parts will cause the diffusion of light being transmitted through said cup-like receptacle and the microbial growth therein, and such that said cup-like receptacles having rough surfaced lower end parts will cause the diffusion of light being transmitted through their irregular profile, thereby allowing comparison between said two different cup-like receptacles with light diffusion not being a variable.