US4775600A
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Highly corrosion-resistant surface-treated steel plate
Assignee: Kansai Paint Co Ltd
•
Filing: 1986-11-18
•
Granted: 1988-10-04
•
Expires: 2006-11-18
Abstract
Abstract The present invention relates to a highly corrosion-resistant surface-treated steel plate. The steel plate of the present invention comprises a zinc deposition or zinc alloy deposition film as the undercoat deposition layer, a chromate film formed on the undercoat deposition layer and a film of a resin composition formed on the chromate film. This resin composition comprises a base resin formed by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin. The resin composition may comprise a polyisocyanate compound as the curing agent. Furthermore, the resin composition may comprise silica or a hardly soluble chromium compound as the additive for improving the corrosion resistance. Moreover, the resin composition may comprise a silane compound as the crosslinking agent for the base resin and silica.
Inventors
- 👤 Takeshi Adaniya
- 👤 Masaaki Yamashita
- 👤 Akira Enatsu
- 👤 Takahiro Kubota
- 👤 Norio Nikaido
- 👤 Yoshiaki Miyosawa
- 👤 Tadashi Nishimoto
- 👤 Kazuhiko Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:12
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/51; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/58; C23; C23C; C23C22/00; C23C22/82; C23C22/83; C23C28/00; C25; C25D; C25D11/00; C25D11/38; B05D2350/00; B05D2350/20; B05D2504/00; C23C2222/00; C23C2222/20; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12556; Y10T428/12569; Y10T428/12611; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799; Y10T428/12861; Y10T428/12951; Y10T428/12972
Claims Analysis
Total Claims: 81
Claim 1
Independent Claim
70 words
A highly corrosion-resistant surface-treated steel plate compromising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the surface of the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin and a polyisocyanate compound.
Claim 2
Dependent Claim
70 words
A highly corrosion-resistant surface-treated steel plate compromising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the surface of the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin and a polyisocyanate compound.
Claim 3
Dependent Claim
28 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 1, wherein the base resin/polyisocyanate compound weight ratio is in the range of from 100/5 to 100/80.
Claim 4
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 1 or 2, wherein the amount (dry base) deposited of chromium in the chromate film is 1 to 1000 mg/m 2 , as calculated as metallic chromium, and the amount deposited of the film of the resin composition is 0.1 to 3.5 g/m 2 .
Claim 5
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 1 or 2, wherein the amount (dry base) deposited of chromium in the chromate film is 10 to 200 mg/m 2 , as calculated as metallic chromium, and the amount deposited of the film of the resin composition was 0.3 to 2.0 g/m 2 .
Claim 6
Dependent Claim
28 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 1, wherein the base resin/polyisocyanate compound weight ratio is in the range of from 100/10 to 100/50.
Claim 7
Dependent Claim
85 words
A highly corrosion-resistant surface-treated steel plate comprising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the surface of the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin, a polyisocyanate compound and silica, the base resin/silica weight ratio being in the range of from 99/1 to 30/70
Claim 8
Dependent Claim
85 words
A highly corrosion-resistant surface-treated steel plate comprising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the surface of the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin, a polyisocyanate compound and silica, the base resin/silica weight ratio being in the range of from 99/1 to 30/70
Claim 9
Dependent Claim
28 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 6, wherein the base resin/polyisocyanate compound weight ratio is in the range of from 100/5 to 100/80.
Claim 10
Dependent Claim
29 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 6 or 7, wherein the base resin/silica weight ratio is in the range of from 90/10 to 30/70.
Claim 11
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 6 or 7, wherein the amount (dry base) deposited of chromium in the chromate film is 1 to 1000 mg/m 2 , as calculated as metallic chromium, and the amount deposited of the film of the resin composition is 0.1 to 3.5 g/m 2 .
Claim 12
Dependent Claim
29 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 6 or 7, wherein the base resin/silica weight ratio is in the range of from 80/20 to 30/70.
Claim 13
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 6 or 7, wherein the amount (dry base) deposited of chromium in the chromate film is 10 to 200 mg/m 2 , as calculated as metallic chromium, and the amount deposited of the film of the resin composition is 0.3 to 2.0 g/m 2 .
Claim 14
Dependent Claim
18 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 6, wherein the silica is hydrophobic silica.
Claim 15
Dependent Claim
28 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 6, wherein the base resin/polyisocyanate compound weight ratio is in the range of from 100/10 to 100/50.
Claim 16
Dependent Claim
101 words
A highly corrosion-resistant surface-treated steel plate comprising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic hydrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin, a polyisocyanate compound, silica and a chromium compound, the base resin/silica weight ratio being in the range of from 99/1 to 30/70 and the base resin/chromium compound weight ratio being in the range of from 99/1 to 60/40.
Claim 17
Dependent Claim
101 words
A highly corrosion-resistant surface-treated steel plate comprising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic hydrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin, a polyisocyanate compound, silica and a chromium compound, the base resin/silica weight ratio being in the range of from 99/1 to 30/70 and the base resin/chromium compound weight ratio being in the range of from 99/1 to 60/40.
Claim 18
Dependent Claim
28 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 14, wherein the base resin/polyisocyanate compound weight ratio is in the range of from 100/5 to 100/80.
Claim 19
Dependent Claim
29 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 14 or 15, wherein the base resin/silica weight ratio is in the range of from 90/10 to 50/50.
Claim 20
Dependent Claim
32 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 14 or 15, wherein the weight ratio of the base resin/chromoum compound is in the range of from 97/3 to 65/35.
Claim 21
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 14 or 15, wherein the amount (dry base) deposited of chromium in the chromate film is 1 to 1000 mg/m 2 , as calculated as metallic chromium, and the amount deposited of the film of the resin composition is 0.1 to 3.5 g/m 2 .
Claim 22
Dependent Claim
29 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 14 or 15, wherein the base resin/silica weight ratio is in the range of form 80/20 to 60/40.
Claim 23
Dependent Claim
32 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 14 or 15, wherein the weight ratio of the base resin/chromium compound is in the range of from 95/5 to 75/25.
Claim 24
Dependent Claim
57 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 14 or 15, wherein the amount (dry base) deposited of chromium in the chromate film is 10 to 200 mg/m 2 , as calculated as the metallic chromium, and the amount deposited of the film of the resin composition is 0.3 to 2.0 g/m 2 .
Claim 25
Dependent Claim
18 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 14, wherein the silica is hydrophobic silica.
Claim 26
Dependent Claim
28 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 14, wherein the base resin/polyisocyanate compound weight ratio is in the range of from 100/10 to 100/50.
Claim 27
Dependent Claim
112 words
A highly corrosion-resistant surface-treated steel plate comprising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the surface of the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin, a polyisocyanate compound, silica and a silane compound, the base resin/silica weight ratio being in the range of from 99/1 to 30/70 and the amount of the silane compound being 0.1 to 15 parts per 100 parts of the sum of the base resin and silica.
Claim 28
Dependent Claim
112 words
A highly corrosion-resistant surface-treated steel plate comprising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the surface of the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin, a polyisocyanate compound, silica and a silane compound, the base resin/silica weight ratio being in the range of from 99/1 to 30/70 and the amount of the silane compound being 0.1 to 15 parts per 100 parts of the sum of the base resin and silica.
Claim 29
Dependent Claim
28 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 24, wherein the base resin/polyisocyanate compound weight ratio is in the range of from 100/5 to 100/80.
Claim 30
Dependent Claim
29 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 24 or 25, wherein the base resin/silica weight ratio is in the range of from 90/10 to 30/70.
Claim 31
Dependent Claim
29 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 24 or 25, wherein the base resin/silica weight ratio is in the range of from 80/20 to 30/70.
Claim 32
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 24 or 25, wherein the amount (dry base) deposited of chromium in the chromate film is 10 to 200 mg/m 2 , as calculated as metallic chromium, and the amount deposited of the film of the resin composition is 0.3 to 2.0 g/m 2 .
Claim 33
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 24 or 25, wherein the amount (dry base) deposited of chromium in the chromate film is 1 to 1000 mg/m 2 , as calculated as metallic chromium, and the amount deposited of the film of the resin composition is 0.1 to 3.5 g/m 2 .
Claim 34
Dependent Claim
18 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 24, wherein the silica is hydrophobic silica.
Claim 35
Dependent Claim
28 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 24, wherein the base resin/polyisocyanate compound weight ratio is in the range of from 100/10 to 100/50.
Claim 36
Dependent Claim
130 words
A highly corrosion-resistant surface-treated steel plate comprising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the surface of the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin, a polyisocyanate compound, silica, a silane compound and a chromium compound, the base resin/silica weight ratio being in the range of from 99/1 to 30/70, the amount of the silane compound being 0.1 to 15 parts per 100 parts of the sum of the base resin and silica and the base resin/chromium compound weight ratio being in the range of from 99/1 to 60/40.
Claim 37
Dependent Claim
130 words
A highly corrosion-resistant surface-treated steel plate comprising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the surface of the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin, a polyisocyanate compound, silica, a silane compound and a chromium compound, the base resin/silica weight ratio being in the range of from 99/1 to 30/70, the amount of the silane compound being 0.1 to 15 parts per 100 parts of the sum of the base resin and silica and the base resin/chromium compound weight ratio being in the range of from 99/1 to 60/40.
Claim 38
Dependent Claim
28 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 32, wherein the base resin/polyisocyanate compound weight ratio is in the range of from 100/5 to 100/80.
Claim 39
Dependent Claim
29 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 32 or 33, wherein the base resin/silica weight ratio is in the range of from 90/10 to 50/50.
Claim 40
Dependent Claim
30 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 32 or 33, wherein the base resin/chromium compound weight ratio is in the range of from 97/3 to 65/35.
Claim 41
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 32 or 33, wherein the amount (dry base) deposited of chromium in the chromate film is 1 to 1000 mg/m 2 , as calculated as metallic chromium and the amount deposited of the film of the resin composition is 0.1 to 3.5 g/m 2 .
Claim 42
Dependent Claim
29 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 32 or 33, wherein the base resin/silica weight ratio is in the range of from 80/20 to 60/40.
Claim 43
Dependent Claim
30 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 32 or 33, wherein the base resin/chromium compound weight ratio is in the range of from 95/5 to 75/25.
Claim 44
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 32 or 33, wherein the amount (dry base) deposited of chromium in the chromate film is 10 to 200 mg/m 2 , as calculated as metallic chromium and the amount deposited of the film of the resin composition is 0.3 to 2.0 g/m 2 .
Claim 45
Dependent Claim
18 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 32, wherein the silica is hydrophobic silica.
Claim 46
Dependent Claim
28 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 32, wherein the base resin/polyisocyanate compound weight ratio is in the range of from 100/10 to 100/50.
Claim 47
Dependent Claim
82 words
A highly corrosion-resistant surface-treated steel plate comprising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the surface of the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin and silica, the base resin/silica weight ratio being in the range of from 99/1 to 30/70.
Claim 48
Dependent Claim
82 words
A highly corrosion-resistant surface-treated steel plate comprising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the surface of the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin and silica, the base resin/silica weight ratio being in the range of from 99/1 to 30/70.
Claim 49
Dependent Claim
27 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 42, wherein the base resin/silica weight ratio is in the range of from 90/10 to 30/70.
Claim 50
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 42 or 43, wherein the amount (dry base) deposited of chromium in the chromate film is 1 to 1000 mg/m 2 , as calculated as metallic chromium and the amount deposited of the film of the resin composition is 0.1 to 3.5 g/m 2 .
Claim 51
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 42 or 43, wherein the amount (dry base) deposited of chromium in the chromate film is 10 to 200 mg/m 2 , as calculated as metallic chromium and the amount deposited of the film of the resin composition is 0.3 to 2.0 g/m 2 .
Claim 52
Dependent Claim
18 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 42, wherein the silica is hydrophobic silica.
Claim 53
Dependent Claim
27 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 42, wherein the base resin/silica weight ratio is in the range of from 80/20 to 30/70.
Claim 54
Dependent Claim
101 words
A highly corrosion-resistant surface-treated steel plate comprising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the surface of the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin, silica and a chromium compound, the base resin/silica weight ratio being in the range of from 99/1 to 30/70 and the base resin/chromium compound weight ratio being in the range of from 99/1 to 60/40.
Claim 55
Dependent Claim
101 words
A highly corrosion-resistant surface-treated steel plate comprising a zinc-deposited or zinc alloy-deposited steel plate, a chromate film formed on the surface of the steel plate and a film of a resin composition formed on the chromate film, said resin composition comprising a base resin obtained by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin, silica and a chromium compound, the base resin/silica weight ratio being in the range of from 99/1 to 30/70 and the base resin/chromium compound weight ratio being in the range of from 99/1 to 60/40.
Claim 56
Dependent Claim
27 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 48, wherein the base resin/silica weight ratio is in the range of from 90/10 to 50/50.
Claim 57
Dependent Claim
30 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 48 or 49, wherein the base resin/chromium compound weight ratio is in the range of from 97/3 to 65/35.
Claim 58
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 48 or 49, wherein the amount (dry base) deposited of chromium in the chromate film is 1 to 1000 mg/m 2 , as calculated as metallic chromium and the amount deposited of the film of the resin composition is 0.1 to 3.5 g/m 2 .
Claim 59
Dependent Claim
30 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 48 or 49, wherein the base resin/chromium compound weight ratio is in the range of from 95/5 to 75/25.
Claim 60
Dependent Claim
56 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 48 or 49, wherein the amount (dry base) deposited of chromium in the chromate film is 10 to 200 mg/m 2 , as calculated as metallic chromium and the amount deposited of the film of the resin composition is 0.3 to 2.0 g/m 2 .
Claim 61
Dependent Claim
18 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 48, wherein the silica is hydrophobic silica.
Claim 62
Dependent Claim
27 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 48, wherein the base resin/silica weight ratio is in the range of from 80/20 to 60/40.
Claim 63
Dependent Claim
40 words
A highly corrosion-resistant surface-treated steel plate as set forth in any one of claims 1, 6, 14, 24, 32, 42 and 48, wherein an alkyl-etherified amino resin is incorporated as a crosslinking agent in the film of the resin composition.
Claim 64
Dependent Claim
52 words
A highly corrosion-resistant surface-treated steel plate as set forth in any one of claims 1, 6, 14, 24, 32, 42 and 48, wherein a resin other than an epoxy resin, selected from the group consisting of acrylic resins, alkyd resins and polyester resins, is incorporated in the film of the resin composition.
Claim 65
Dependent Claim
76 words
A highly corrosion-resistant surface-treated steel plate as set forth in any one of claims 1, 6, 14, 24, 32, 42 and 48, wherein the zinc-deposited or zinc alloy-deposited film, the chromate film and the film of the resin composition are arranged on one surface of the steel plate substrate in this order from the surface side of the steel plate substrate, and the other surface of the steel plate substrate is not deposited with a metal.
Claim 66
Dependent Claim
75 words
A highly corrosion-resistant surface-treated steel plate as set forth in any one of claims 1, 6, 14, 24, 32, 42 and 48, wherein the zinc-deposited or zinc alloy-deposited film, the chromate film and the film of the resin composition are arranged on one surface of the steel plate substrate in this order from the surface side of the steel plate substrate and the other surface of the steel plate substrate is deposited with a metal.
Claim 67
Dependent Claim
62 words
A highly corrosion-resistant surface-treated steel plate as set forth in any one of claims 1, 6, 14, 24, 32, 42 and 48, wherein the zinc-deposited or zinc alloy-deposited film, the chromate film and the film of the resin composition are arranged on each of the surfaces of the steel plate substrate in this order from the surface of the steel plate substrate.
Claim 68
Dependent Claim
33 words
A highly corrosion-resistant surface-treated steel plate as set forth in any one of claims 1, 6, 14, 24, 32, 42, 48, wherein the zinc alloy-deposited steel plate is a zinc/nickel alloy-deposited steel plate.
Claim 69
Dependent Claim
41 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 61, wherein at least one element selected from the group consisting of Ni, Fe, Mo, Co, AL and Cr is incorporated in the basic component of the deposited zinc alloy.
Claim 70
Dependent Claim
27 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 61, wherein the nickel content in the zinc/nickel alloy-deposited film is 5 to 20% by weight.
Claim 71
Dependent Claim
33 words
A highly corrosion-resistant surface-treated steel plate as set forth in any one of claims 1, 6, 14, 24, 32, 42, 48, wherein the zinc alloy-deposited steel plate is a zinc/iron alloy-deposited steel plate.
Claim 72
Dependent Claim
41 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 64, wherein at least one element selected from the group consisting of Ni, Fe, Mo, Co, Al and Cr is incorporated in the basic component of the deposited zinc alloy.
Claim 73
Dependent Claim
33 words
A highly corrosion-resistant surface-treated steel plate as set forth in any one of claims 1, 6, 14, 24, 32, 42, 48, wherein the zinc alloy-deposited steel plate is a zinc/manganese alloy-deposited steel plate.
Claim 74
Dependent Claim
27 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 66, wherein the manganese content in the zinc/manganese alloy-deposited film is 30 to 85% by weight.
Claim 75
Dependent Claim
41 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 66, wherein at least one element selected from the group consisting of Ni, Fe, Mo, Co, Al and Cr is incorporated in the basic component of the deposited zinc alloy.
Claim 76
Dependent Claim
33 words
A highly corrosion-resistant surface-treated steel plate as set forth in any one of claims 1, 6, 14, 24, 32, 42, 48, wherein the zinc alloy-deposited steel plate is a zinc/aluminum alloy-deposited steel plate.
Claim 77
Dependent Claim
41 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 69, wherein at least one element selected from the group consiting of Ni, Fe, Mo, Co, Al and Cr is incorporated in the basic component of the deposited zinc alloy.
Claim 78
Dependent Claim
33 words
A highly corrosion-resistant surface-treated steel plate as set forth in any one of claims 1, 6, 14, 24, 32, 42, 48, wherein the zinc alloy-deposited steel plate is a zinc/cobalt/chromium alloy-deposited steel plate.
Claim 79
Dependent Claim
41 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 71, wherein at least one element selected from the group consisting of Ni, Fe, Mo, Co, Al and Cr is incorporated in the basic component of the deposited zinc alloy.
Claim 80
Dependent Claim
35 words
A highly corrosion-resistant surface-treated steel plate as set forth in any one of claims 1, 6, 14, 24, 32, 42, 48, wherein the zinc-deposited or zinc alloy-deposited film comprises at least two metal deposition layers.
Claim 81
Dependent Claim
28 words
A highly corrosion-resistant surface-treated steel plate as set forth in claim 73, wherein the zinc alloy-deposited film comprises at least two zinc/iron alloy-deposited layers differing in iron content.
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) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |