Patent US1719652A successfully refreshed from Google Patents.
Patent US4613481A successfully refreshed from Google Patents.
US4613481A
Expired / Lapsed
US
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Mercapthothiazoline corrosion inhibiting compositions
Assignee: ECC SPECIALTY CHEMICALS Inc
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Filing: 1985-08-16
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Granted: 1986-09-23
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Expires: 2005-08-16
Abstract
Abstract The present invention is directed to a composition useful for inhibiting the corrosion of copper and copper alloy metals in an aqueous system comprising mercaptothiazoline and ferrous ions. The present invention is also directed to a method of inhibiting the corrosion of copper and copper alloy metals in an aqueous system comprising maintaining in the aqueous system at least about 1 ppm (parts per million) of mercaptothiazoline, preferably in combination with ferrous ions.
Inventors
- 👤 Jasbir S. Gill
- 👤 Arthur J. Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:39
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
21 words
A composition useful for inhibiting the corrosion of copper and copper alloys in an aqueous system comprising mercaptothiazoline and ferrous ion.
Claim 2
Dependent Claim
21 words
A composition useful for inhibiting the corrosion of copper and copper alloys in an aqueous system comprising mercaptothiazoline and ferrous ion.
Claim 3
Dependent Claim
19 words
The composition of claim 1, wherein the ratio of mercaptothiazoline to ferrous ion is 1:1 to 1:10, by weight.
Claim 4
Dependent Claim
21 words
The composition of claim 2, wherein the weight ratio of mercaptothiazoline to ferrous ion is from about 1:1 to about 1:4.
Claim 5
Dependent Claim
19 words
The composition of claim 1, wherein said ferrous ion is provided by K 4 Fe(CN) 6 .3H 2 O.
Claim 6
Independent Claim
28 words
The method of inhibiting the corrosion of copper and copper alloys in an aqueous system comprising maintaining in the aqueous system at least about 1 ppm of mercaptothiazoline.
Claim 7
Independent Claim
28 words
The method of inhibiting the corrosion of copper and copper alloys in an aqueous system comprising maintaining in the aqueous system at least about 1 ppm of mercaptothiazoline.
Claim 8
Dependent Claim
18 words
The method of claim 5, wherein, in addition to mercaptothiazoline, ferrous ion is maintained in the aqueous system.
Claim 9
Dependent Claim
19 words
The method of claim 6, wherein the ratio of mercaptothiazoline to ferrous ion is 1:1 to 1:10, by weight.
Claim 10
Dependent Claim
21 words
The method of claim 7, wherein the weight ratio of mercaptothiazoline to ferrous ion is from about 1:1 to about 1:4.
Claim 11
Dependent Claim
20 words
The method of claim 6, wherein said ferrous ion is provided by K 4 Fe(CN) 6 . 3H 2 O.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |