US4247344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rust preventing treatment of metal-plated steel materials
Assignee: Nippon Steel Corp
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Filing: 1979-06-05
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Granted: 1981-01-27
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Expires: 1999-06-05
Abstract
Abstract A rust preventing treatment for a metal-plated steel product which comprises treating the metal-plated steel product with an aqueous solution containing 0.01% to 10% by weight of tannic acid on the basis of the aqueous solution and 0.001% to 10% by weight of a water-soluble or water-dispersible polymer which is stable when mixed with the tannic acid to form a corrosion resistant film on the surface of the metal-plated steel product.
Inventors
- 👤 Seizo Tsuda
- 👤 Eiichi Tarumi
- 👤 Hironobu Kawaskai
- 👤 Takashi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:44
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08; C23C22/20; C23C22/48; C23C22/53
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A rust preventing treatment for zinc-plated and zinc-alloy-plated steel products which comprises treating the zinc-plated and zinc-alloy-plated steel products with an aqueous solution containing 0.01% to 10% by weight of tannic acid on the basis of the aqueous solution and 0.001% to 10% by weight of a water soluble or water dispersible polymer selected from the group consisting of aluminum bisphosphate, magnesium biphosphate, polyvinyl pyrrolidones, polyacrylamides, polyacrylic acids, sodium alginate, polyacrylic acid esters and polyvinyl acetates, which are stable when mixed with the tannic acid, to form a corrosion resistant film on the surface of the zinc-plated and zinc-alloy-plated steel products.
Claim 2
Dependent Claim
101 words
A rust preventing treatment for zinc-plated and zinc-alloy-plated steel products which comprises treating the zinc-plated and zinc-alloy-plated steel products with an aqueous solution containing 0.01% to 10% by weight of tannic acid on the basis of the aqueous solution and 0.001% to 10% by weight of a water soluble or water dispersible polymer selected from the group consisting of aluminum bisphosphate, magnesium biphosphate, polyvinyl pyrrolidones, polyacrylamides, polyacrylic acids, sodium alginate, polyacrylic acid esters and polyvinyl acetates, which are stable when mixed with the tannic acid, to form a corrosion resistant film on the surface of the zinc-plated and zinc-alloy-plated steel products.
Claim 3
Dependent Claim
22 words
A rust preventing treatment according to claim 1, in which the aqueous solution contains 0.5% to 5.0% by weight of tannic acid.
Claim 4
Dependent Claim
19 words
A rust preventing treatment according to claim 1, wherein the aqueous solution contains 0.01% to 1.0% of the polymer.
Claim 5
Dependent Claim
18 words
A rust preventing treatment according to claim 1, wherein the metal-plated steel product is a zinc-plated steel product.
Claim 6
Dependent Claim
19 words
A rust preventing treatment according to claim 1, in which the metal-plated steel product is a zinc-alloy-plated steel product.
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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |