Patent US4028055A successfully refreshed from Google Patents.
US4028055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-corrosive agent for metals
Assignee: Asahi Kasei Corp
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Filing: 1976-03-17
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Granted: 1977-06-07
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Expires: 1996-03-17
Abstract
Abstract A method of inhibiting corrosion of metals comprising applying to a metal surface in an effective concentration a saturated aliphatic triamine of 9 carbon atoms having at each terminal position a primary amino group and being branched in the 4-position of the main chain. Such specific triamines include 1,3,6-triaminomethylhexane and 1,2,3-triaminoethylpropane. Addition products and condensation products derived from these organic triamines are also effective. The present anti-corrosive agents show a remarkable rust preventive effect to metals even when used in a small amount and are non toxic.
Inventors
- 👤 Tsunesuke Doi
- 👤 Hiroshi Komoto
- 👤 Masazumi Chono
- 👤 Akira Inoue
- 👤 Kazuaki Saito
- 👤 Isao Shinozuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:51
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/145; C23F11/04; C23F11/141; C23F11/149
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A method of inhibiting corrosion of metal surfaces comprising applying to a metal surface a solution or dispersion containing an effective concentration of at least one saturated aliphatic triamine of 9 carbon atoms having a main chain which is branched at the 4-position and having a primary amino group at each carbon atom in a terminal position.
Claim 2
Independent Claim
57 words
A method of inhibiting corrosion of metal surfaces comprising applying to a metal surface a solution or dispersion containing an effective concentration of at least one saturated aliphatic triamine of 9 carbon atoms having a main chain which is branched at the 4-position and having a primary amino group at each carbon atom in a terminal position.
Claim 3
Dependent Claim
12 words
A method according to claim 1 in which the triamine is 1,3,6-triaminomethylhexane.
Claim 4
Dependent Claim
12 words
A method according to claim 1 in which the triamine is 1,2,3-triaminoethyl-propane.
Claim 5
Dependent Claim
17 words
A method according to claim 1 in which the concentration of triamine is at least 20 ppm.
Claim 6
Dependent Claim
15 words
A method according to claim 4 in which the concentration is 20 - 1000 ppm.
Claim 7
Dependent Claim
30 words
A method according to claim 1 in which the metal surface is iron, aluminum, cooper or an alloy thereof, whereby the formation of rust is prevented on the metal surface.
Claim 8
Dependent Claim
28 words
A method according to claim 1 in which the triamine is dissolved or dispersed in water in aqueous acid or alkali, in an organic solvent or in oil.
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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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |