Patent US4523338A successfully refreshed from Google Patents.
Patent US4760197A successfully refreshed from Google Patents.
US4760197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibition
Assignee: Avecia Ltd
•
Filing: 1987-09-15
•
Granted: 1988-07-26
•
Expires: 2007-09-15
Abstract
Abstract A process which comprises contacting the surface of a metal with an alkyl or acyl substituted catechol. The contacting may be effected using the substituted catechol alone or in a suitable medium for example as a solution or emulsion. The contacting is effective in provided corrosion inhibition even with lightly rusted iron surfaces.
Inventors
- 👤 Bernard Tury
- 👤 Glyn R. John
- 👤 Edward G. Scovell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:15
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/12; C23F11/122
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
18 words
A process which comprises contacting the surface of a metal with a substituted hydroxybenzene of formula ##STR3## wherein:
Claim 2
Dependent Claim
18 words
A process which comprises contacting the surface of a metal with a substituted hydroxybenzene of formula ##STR3## wherein:
Claim 3
Dependent Claim
11 words
R is an acyl group containing 7 to 30 carbon atoms.
Claim 4
Dependent Claim
11 words
R is an acyl group containing 7 to 30 carbon atoms.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the substituted hydroxybenzene has the structure ##STR4## wherein:
Claim 6
Dependent Claim
12 words
R 1 is an alkyl group containing 7 to 22 carbon atoms.
Claim 7
Dependent Claim
12 words
R 1 is an alkyl group containing 7 to 22 carbon atoms.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein the substituted hydroxybenzene is 4-octadecanoylcatechol or 4-hexadecanoylcatechol.
Claim 9
Dependent Claim
42 words
The process of claim 1 wherein the substituted hydroxybenzene is applied to the metal surface as a solution in an organic solvent, as an aqueous emulsion of the substituted hydroxybenzene or as an aqueous emulsion of a solution of the substituted hydroxybenzene.
Claim 10
Dependent Claim
18 words
A process as claimed in claim 4 wherein the substituted hydroxybenzene is incorporated into a surface coating composition.
Claim 11
Dependent Claim
17 words
The process of claim 5 wherein the surface coating composition is a paint, lacquer or a resin.
Claim 12
Dependent Claim
18 words
The process of claim 6 wherein contacting is effected at a temperature of from 0 to 50° C.
Claim 13
Dependent Claim
15 words
The process of claims 7 wherein the metal is iron, zinc, copper, tin or aluminium.
Claim 14
Dependent Claim
15 words
The process of claim 8 wherein the metal surface is a lightly rusted iron surface.
Claim 15
Dependent Claim
13 words
A surface coating composition comprising a substituted hydroxybenzene of the formula ##STR5## wherein:
Claim 16
Dependent Claim
13 words
A surface coating composition comprising a substituted hydroxybenzene of the formula ##STR5## wherein:
Claim 17
Dependent Claim
11 words
R is an acyl group containing 7 to 30 carbon atoms.
Claim 18
Dependent Claim
11 words
R is an acyl group containing 7 to 30 carbon atoms.
Claim 19
Dependent Claim
36 words
A metal having on at least one surface thereof a coating which is, or which contains, a substituted hydroxybenzene of the formula ##STR6## wherein: R is an acyl group containing from 7 to 30 carbon atoms.
Claim 20
Dependent Claim
36 words
A metal having on at least one surface thereof a coating which is, or which contains, a substituted hydroxybenzene of the formula ##STR6## wherein: R is an acyl group containing from 7 to 30 carbon atoms.
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) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |