Patent US1183477A successfully refreshed from Google Patents.
US4668474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercaptobenzothiazole and ferrous ion corrosion inhibiting compositions
Assignee: ECC SPECIALTY CHEMICALS Inc
•
Filing: 1985-07-22
•
Granted: 1987-05-26
•
Expires: 2005-07-22
Abstract
Abstract The present invention is directed to a composition and method for inhibiting the corrosion of copper and copper alloy metals in aqueous systems. The composition comprises mercaptobenzothiazole and added ferrous ions in a ratio of 1:1 to 1:10, by weight. The method comprises adding this composition to the aqueous system being treated.
Inventors
- 👤 Jasbir S. Gill
- 👤 Richard G. Varsanik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:21
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
50 words
A method of inhibiting the corrosion of copper and copper alloys in an aqueous system comprising maintaining in said aqueous system at least about 1 ppm of a composition comprising mercaptobenzothiazole and added ferrous ion, wherein the ratio of mercaptobenzothiazole to added ferrous ion is 1:1 to 1:10 by weight.
Claim 2
Independent Claim
50 words
A method of inhibiting the corrosion of copper and copper alloys in an aqueous system comprising maintaining in said aqueous system at least about 1 ppm of a composition comprising mercaptobenzothiazole and added ferrous ion, wherein the ratio of mercaptobenzothiazole to added ferrous ion is 1:1 to 1:10 by weight.
Claim 3
Dependent Claim
22 words
The method of claim 1, wherein the weight ratio of mercaptobenzothiazole to added ferrous ion is from about 1:1 to about 1:4.
Claim 4
Dependent Claim
21 words
The method of claim 1, wherein said added ferrous ion is provided by K 4 Fe(CN) 6 . 3H 2 O.
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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |