# US 5,702,588 A · Soap fiber extraction process

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- Number: US 5,702,588 A
- Document ID: US5702588A
- Status: Granted
- Kind: A
- Application number: 08/710,864
- Filed: 1996-09-23
- Granted: 1997-12-30
- Earliest claimed: 1996-09-23
- Assignees: Semtech Corporation
- Inventors: Michael R. Funk; Larry E. Irwin; Michael D. Foster
- Web page: https://patentgrep.com/patent/US5702588A

## CPC

- G01N 1/28: Preparing specimens for investigation {including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q}(mounting specimens on microscopic slides G02B21/34; means for supporting the objects or the materials to be analysed in electron microscopes H01J37/20 {; laboratory gas handling apparatus B01L5/00})
- G01N 1/38: Diluting, dispersing or mixing samples
- G01N 1/4077: {by other techniques involving separation of suspended solids}
- 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)

## Abstract

A method of separating soap fibers from the liquid phase component of grease to prepare the fibers for microscopic analysis includes the steps of admixing a sample of the grease with a solvent to remove the liquid phase component from the fibers and provide a final liquid product having the fibers in suspension therein, contacting the final product with a pair of spaced electrodes, applying a direct voltage across the electrodes to charge the same positive and negative respectively, and withdrawing for analysis a small quantity of the final product from a region thereof proximate the negative electrode after the voltage has been applied for a predetermined energization period. The withdrawn quantity may be deposited on a polished carbon stub and further prepared for analysis by a scanning electron microscope.

## Claims

### Claim 1

A method of separating soap fibers from the liquid phase component of grease to prepare the fibers for microscopic analysis, said method comprising the steps of:
(a) admixing a sample of the grease with a solvent to remove the liquid phase component from the fibers and provide a final liquid product having said fibers therein;
(b) contacting said final product with a pair of spaced electrodes;
(c) applying an electromotive force to said electrodes to charge the same positive and negative respectively; and
(d) withdrawing for analysis a small quantity of said final product from a region thereof proximate the negative electrode, after said electromotive force has been applied for a predetermined period of time.

### Claim 2 (depends on 1)

The method as claimed in claim 1 and further comprising the additional step of depositing the withdrawn quantity on a support for microscopic viewing after evaporation of the solvent.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein said step (a) includes diluting the admixture with repeated amounts of said solvent until said final product is essentially free of said liquid phase component.

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein said step (c) includes applying a direct voltage across said electrodes.

### Claim 5 (depends on 4)

The method as claimed in claim 4, wherein said voltage is at least approximately nine volts.

### Claim 6 (depends on 1)

The method as claimed in claim 1, wherein said predetermined period of time is at least approximately five minutes.

### Claim 7

A method of separating soap fibers from the liquid phase component of grease to prepare the fibers for microscopic analysis, said method comprising the steps of:
(a) admixing a sample of the grease with a solvent to remove the liquid phase component from the fibers, and repeatedly diluting the admixture with additional amounts of said solvent to provide a final liquid product which is essentially free of said liquid phase component and has said fibers in suspension therein;
(b) introducing said final product to a vessel containing a pair of spaced electrodes;
(c) applying an electromotive force to said electrodes to charge the same positive and negative respectively and cause a direct current to flow in the final product;
(d) withdrawing a small quantity of said final product from a region thereof proximate the negative electrode, after said electromotive force has been applied for a predetermined period of time; and
(e) depositing the withdrawn quantity on a conductive support for viewing by an electron microscope after evaporation of the solvent.