US5420041A
Expired / Lapsed
US
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Method of acid value determination by infrared absorption
Assignee: Kurashiki Spinning Co Ltd
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Filing: 1993-09-23
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Granted: 1995-05-30
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Expires: 2013-09-23
Abstract
Abstract A method of determining acid value with high accuracy, using an infrared spectrometer is provided, in which the absorbance is determined attributable to carboxylic group based on an infrared absorption spectrum at wave numbers around 3300 cm -1 .
Inventors
- 👤 Kazuhiko Matsushita
- 👤 Hiroshi Yokota
- 👤 Keiji Fujita
- 👤 Akihiro Tsukamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:16
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/26; G01N33/28; G01N33/2835; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/3577; G01N33/2888; G01N21/01; G01N21/03; G01N21/05; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/200833; Y10T436/201666
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
A method of determining an acid value of a sample of fats and oils which comprises measuring the infrared absorption spectrum of the sample at wave numbers around 3300 cm -1 , wherein the sample has a thickness of 0.1-10 mm, and determining the acid value of the sample based on the absorption spectrum.
Claim 2
Independent Claim
54 words
A method of determining an acid value of a sample of fats and oils which comprises measuring the infrared absorption spectrum of the sample at wave numbers around 3300 cm -1 , wherein the sample has a thickness of 0.1-10 mm, and determining the acid value of the sample based on the absorption spectrum.
Claim 3
Dependent Claim
15 words
A method according to claim 1, wherein the thickness of the sample is 0.5-5 mm.
Claim 4
Independent Claim
54 words
A method of determining the acid value of a sample of fats and oils which comprises measuring the infrared absorption spectrum of the sample at wave numbers of 3410-3050 cm -1 , wherein the sample has a thickness of 0.1-10 mm, and determining the acid value of the sample based on the absorption spectrum.
Claim 5
Independent Claim
54 words
A method of determining the acid value of a sample of fats and oils which comprises measuring the infrared absorption spectrum of the sample at wave numbers of 3410-3050 cm -1 , wherein the sample has a thickness of 0.1-10 mm, and determining the acid value of the sample based on the absorption spectrum.
Claim 6
Independent Claim
54 words
A method of determining the acid value of a sample of fats and oils which comprises measuring the infrared absorption spectrum of the sample at wave numbers of 3300-3050 cm -1 , wherein the sample has a thickness of 0.1-10 mm, and determining the acid value of the sample based on the absorption spectrum.
Claim 7
Independent Claim
54 words
A method of determining the acid value of a sample of fats and oils which comprises measuring the infrared absorption spectrum of the sample at wave numbers of 3300-3050 cm -1 , wherein the sample has a thickness of 0.1-10 mm, and determining the acid value of the sample based on the absorption spectrum.
References Cited (Backward Citations)
US5049742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-05-29 | 1998-11-28 | 1999-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-29 | 2002-11-28 | 2003-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-29 | 2006-11-28 | 2007-05-30 | $7700.00 | Window Closed / Lapsed |