US3997293A
Expired / Lapsed
US
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Use of dihydro-nitrogen heterocyclic phosphoramidates as corrosion inhibitors
Assignee: Baker Petrolite LLC
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Filing: 1975-08-07
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Granted: 1976-12-14
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Expires: 1995-08-07
Abstract
Abstract Dihydro-nitrogen heterocyclic phosphoramidates of the general formula ##STR1## where N -- C represents a dihydro-nitrogen ring, R is a substituted group, preferably hydrocarbon, X is O or S, and R 1 is an alcohol or phenolic moiety, preferably hydrocarbon; the preparation and uses thereof particularly as corrosion inhibitors, microbiocides, etc.
Inventors
- 👤 Derek Redmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:32
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; C23G1/066; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/553; C07F9/576; C07F9/58; C07F9/59; C09; C09K; C09K8/00; C09K8/54; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C02; C02F; C02F2103/00; C02F2103/02; C02F2103/023; Y; Y10; Y10S; Y10S507/00; Y10S507/933; Y10S507/934
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
57 words
A process of inhibiting corrosion of metals in contact with a corrosive fluid which comprises contacting the metal surfaces with a dihydro-nitrogen heterocyclic phosphoramidate of the formula ##STR20## where N -- C represents a 1,2-dihydropyridine group, R is lower alkyl or phenyl and R 1 is lower alkyl, cyclohexyl, or phenyl and X is O or S.
Claim 2
Dependent Claim
57 words
A process of inhibiting corrosion of metals in contact with a corrosive fluid which comprises contacting the metal surfaces with a dihydro-nitrogen heterocyclic phosphoramidate of the formula ##STR20## where N -- C represents a 1,2-dihydropyridine group, R is lower alkyl or phenyl and R 1 is lower alkyl, cyclohexyl, or phenyl and X is O or S.
Claim 3
Dependent Claim
24 words
The process of claim 1 where N -- C is ##STR21## and where R is phenyl, R 1 is ethyl and X is O.
Claim 4
Dependent Claim
24 words
The process of claim 1 where N -- C is ##STR22## and where R is butyl, R 1 is methyl and X is S.
Claim 5
Dependent Claim
24 words
The process of claim 1 where N -- C is ##STR23## and where R is methyl, R 1 is ethyl and X is O.
Claim 6
Dependent Claim
24 words
The process of claim 1 where N -- C is ##STR24## and where R is butyl, R 1 is ethyl and X is O.
Claim 7
Dependent Claim
24 words
The process of claim 1 where N -- C is ##STR25## and where R is butyl, R 1 is methyl, and X is S.
Claim 8
Dependent Claim
24 words
The process of claim 1 where N -- C is ##STR26## and where R is methyl, R 1 is isopropyl and X is O.
Claim 9
Dependent Claim
24 words
The process of claim 1 where N -- C is ##STR27## and where R is phenyl, R 1 is ethyl and X is O.
Claim 10
Dependent Claim
14 words
The process of claim 1 wherein the phosphoramidate is added to the corrosive fluid.
Claim 11
Dependent Claim
14 words
The process of claim 9 wherein the metal surfaces are surfaces of ferrous metals.
Claim 12
Dependent Claim
11 words
The process of claim 10 wherein the corrosive fluid is acidic.
Claim 13
Dependent Claim
12 words
The process of claim 10 wherein the corrosive fluid is a brine.
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) | 1979-12-14 | 1980-06-14 | 1980-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-14 | 1984-06-14 | 1984-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-14 | 1988-06-14 | 1988-12-14 | $7700.00 | Window Closed / Lapsed |