US4445940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process to remove corrosion deposits using aqueous-base ferromagnetic fluids
Assignee: Georgia-Pacific LLC
•
Filing: 1982-11-30
•
Granted: 1984-05-01
•
Expires: 2002-11-30
Abstract
Abstract A process for the removal of corrosion deposits from metal surfaces using a ferromagnetic fluid is disclosed.
Inventors
- 👤 Karen F. Hulford
- 👤 Jerry W. Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:01
CPC Classifications
C; C23; C23G; C23G1/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
46 words
A process for the removal of corrosion deposits from corroded metal surfaces which comprises contacting said corroded metal surfaces with an aqueous-base ferromagnetic fluid in an amount effective to remove corrosion deposits and thereafter removing said aqueous-base ferromagnetic material and corrosion deposits from said metal surface.
Claim 2
Dependent Claim
46 words
A process for the removal of corrosion deposits from corroded metal surfaces which comprises contacting said corroded metal surfaces with an aqueous-base ferromagnetic fluid in an amount effective to remove corrosion deposits and thereafter removing said aqueous-base ferromagnetic material and corrosion deposits from said metal surface.
Claim 3
Dependent Claim
37 words
A process according to claim 1 wherein said corroded metal surface is immersed in said ferromagnetic fluid for the removal of said corrosion deposits for a period of time sufficient to remove or loosen said corrosion deposits.
Claim 4
Dependent Claim
39 words
A process according to claim 1 wherein said corrosion deposits are removed by contacting said corroded metal surface with said ferromagnetic fluid and the fluid agitated for a period of time sufficient to loosen or remove said corrosion deposits.
Claim 5
Dependent Claim
43 words
A process according to claim 1 wherein said ferromagnetic fluid is applied to said corroded metal surface for a period of time sufficient to remove or loosen said corrosion deposits and thereafter removing said ferromagnetic fluid and corrosion deposits from said metal surface.
Claim 6
Dependent Claim
31 words
A process according to claims 1, 2, 3 or 4 wherein said aqueous-base ferromagnetic fluid contains sulfonate lignin or sulfonated tannin combined with iron in the form of an iron oxide.
Claim 7
Dependent Claim
23 words
A process according to claim 1 wherein said aqueous-base ferromagnetic fluid is obtained by reaction of soluble iron salts with sulfonated phenol-formaldehyde polymer.
Claim 8
Dependent Claim
17 words
A process according to claim 1 wherein said aqueous-base ferromagnetic fluid is obtained by a grinding process.
Claim 9
Dependent Claim
12 words
A process according to claim 1 wherein said metal surface is iron.
Claim 10
Dependent Claim
13 words
A process according to claim 1 wherein said metal surface is mild steel.
Claim 11
Dependent Claim
21 words
A process according to claim 1 wherein said metal surface is selected from the group consisting of aluminum, brass and copper.
Claim 12
Dependent Claim
20 words
A process according to claim 1 wherein said metal surface is selected from the group consisting of chromium and zinc.
Claim 13
Dependent Claim
26 words
A process according to claim 1 wherein the temperature of the contacting step is in the range of from about 25° C. to about 100° C.
Claim 14
Dependent Claim
25 words
A process according to claim 1 wherein the concentration of said aqueous-base ferromagnetic fluid is from about 6 weight percent to about 30 weight percent.
Claim 15
Dependent Claim
26 words
A process according to claim 8 or 9 wherein the pH of the ferromagnetic fluid is in the range of from about 5 to about 8.
References Cited (Backward Citations)
US3488531A
Cited
US3483969A
Cited
US3531413A
Cited
US3612630A
Cited
US3620584A
Cited
US3648269A
Cited
US3946103A
Cited
US3917538A
Cited
US4019995A
Cited
US4018691A
Cited
US4019994A
Cited
US4093778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |