US3620667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing tubercles from a ferrous surface and inhibiting further tubercle formation thereon
Assignee: WILLIAM E ZIMMIE
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Filing: 1969-11-18
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Granted: 1971-11-16
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Expires: 1989-11-18
Abstract
Abstract Treating a ferrous surface to remove tubercles of corrosion and inhibit further corrosion includes the steps of providing an aqueous solution of polyelectrolytic organic polymer and applying it to the corroded ferrous surface. The polymer (1) is prepared from compounds characterized by the formula: WHEREIN R is selected from the group consisting of nitrile, amide and carboxyl radicals, (2) has an average molecular weight ranging from about 25,000 to 25 million and (3) has a weight concentration of 0.1 to 1,000 parts per million parts of water.
Inventors
- 👤 William E Zimmie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:41
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/173
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
The method of claim 1 wherein said polymer is a copolymer.
Claim 2
Dependent Claim
11 words
The method of claim 1 wherein R is an amide radical.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein R is a carboxyl radical and is represented by the formula -COOM, wherein M is selected from the group consisting of hydrogen, ammonium, metals and organic radicals.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein the weight concentration of the polymer is approximately in the range 0.1 to 100 parts per million parts of water.
References Cited (Backward Citations)
US2529178A
Cited
US3085916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |