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Patent US4415671A successfully refreshed from Google Patents.
US4415671A
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Method for modifying electron spin resonance signals from hydrocarbon crude
Assignee: Chevron USA Inc
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Filing: 1980-10-30
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Granted: 1983-11-15
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Expires: 2000-10-30
Abstract
Abstract Method for enhancing electron spin resonance signals from crude petroleum by contacting the crude petroleum with a chemical which effects the population of free radical asphaltenes in the crude petroleum. The enhancement is in a positive sense when the chemical is a halogen and particularly iodine. The enhancement is in a negative sense (suppression) when the chemical is ferric chloride.
Inventors
- 👤 Stephen W. Nicksic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:08
CPC Classifications
G; G01; G01N; G01N24/00; G01N24/10; G01N33/00; G01N33/26; G01N33/28; G01N33/2835; Y; Y10; Y10T; Y10T436/00; Y10T436/21; Y10T436/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
43 words
A method for enhancing electron spin resonance signals from crude petroleum comprising contacting said samples with a halogen or ferric chloride to affect the number of the population of free radical asphaltenes in said crude petroleum while detecting said electron spin resonance signals.
Claim 2
Independent Claim
43 words
A method for enhancing electron spin resonance signals from crude petroleum comprising contacting said samples with a halogen or ferric chloride to affect the number of the population of free radical asphaltenes in said crude petroleum while detecting said electron spin resonance signals.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein ferric chloride is added to decrease the population of free radicals and suppress the detected electron spin resonance signal.
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein said ferric chloride is in a solution from the group including benzene, toluene, xylene, or carbon tetrachloride.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein halogen is added to increase the population of free radicals and enhance the detected electron spin resonance signals.
Claim 6
Dependent Claim
10 words
The method of claim 4 wherein said halogen is iodine.
Claim 7
Dependent Claim
12 words
The method of claim 5 wherein said iodine is a fluid solution.
Claim 8
Dependent Claim
59 words
The method of claim 4 wherein said crude petroleum is associated with samples of earth formations in which crude petroleum has been present and said samples are contacted with said enhancing halogen to distinguish electron spin resonance signals from electrons within crude petroleum on said sample from electron spin resonance signals from electrons within said earth formation constituent materials.
Claim 9
Dependent Claim
42 words
The method of claim 7 wherein a quantitative measure of crude petroleum within said earth formation sample is made by measuring the magnitude of enhancement of said electron spin resonance signal in response to contacting said earth formation sample with said halogen.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |