US4837090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant coating for fasteners
Assignee: WHYCO TECHNOLOGIES Inc
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Filing: 1988-05-11
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Granted: 1989-06-06
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Expires: 2008-05-11
Abstract
Abstract A corrosion resistant coating and process comprises the following layers applied in sequence over a ferrous metal substrate: a micro-throwing nickel-zinc alloy plating; an optional galvanically protective zinc metal plating; a zinc-nickel alloy plating containing 5 to 30 weight percent nickel; and an organic coating such as paint. The coating is preferably used with steel drill screw fasteners wherein it also reduces installation torque and drill time.
Inventors
- 👤 Jacob Hyner
- 👤 Steven Gradowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:11
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/10; C25D5/60; C25D5/605; C25D5/611; Y; Y10; Y10S; Y10S411/00; Y10S411/90; Y10S411/901; Y10S411/902; Y10S411/903; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12861; Y10T428/12937; Y10T428/12944
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
62 words
A corrosion resistant fastener having a ferrous metal substrate and, in sequence, the following layers over said substrate: (a) a first layer of non-strike nickel or a nickel alloy plating of at least 0.00005 in. thickness; (b) a second layer of zinc-based alloy plating containing from about 8 to 15 weight percent nickel; and (c) a third layer of an organic coating.
Claim 2
Dependent Claim
62 words
A corrosion resistant fastener having a ferrous metal substrate and, in sequence, the following layers over said substrate: (a) a first layer of non-strike nickel or a nickel alloy plating of at least 0.00005 in. thickness; (b) a second layer of zinc-based alloy plating containing from about 8 to 15 weight percent nickel; and (c) a third layer of an organic coating.
Claim 3
Dependent Claim
19 words
The fastener of claim 1 wherein said first plating layer (a) is nickel of greater than 0.0001 in. thickness.
Claim 4
Dependent Claim
21 words
The fastener of claim 1 wherein said first plating layer (a) is a nickel alloy of greater than 0.0001 in. thickness.
Claim 5
Dependent Claim
13 words
The fastener of claim 1 wherein said layers have been produced by electroplating.
Claim 6
Dependent Claim
13 words
The fastener of claim 4 wherein layer (a) is a micro-throwing nickel-zinc alloy.
Claim 7
Dependent Claim
12 words
The fastener of claim 5 wherein said fastener comprises a drill screw.
Claim 8
Dependent Claim
76 words
A corrosion resistant fastener having a ferrous metal substrate and, in sequence, the following layers over said substrate: (a) a micro-throwing non-strike nickel based alloy plating of at least 0.00005 in. thickness on the substrate; (b) a zinc based alloy plating containing from about 85 to 92 weight percent zinc and from about 8 to 15 weight percent nickel on the nickel based alloy layer; and (c) an organic coating on the zinc based alloy layer.
Claim 9
Dependent Claim
76 words
A corrosion resistant fastener having a ferrous metal substrate and, in sequence, the following layers over said substrate: (a) a micro-throwing non-strike nickel based alloy plating of at least 0.00005 in. thickness on the substrate; (b) a zinc based alloy plating containing from about 85 to 92 weight percent zinc and from about 8 to 15 weight percent nickel on the nickel based alloy layer; and (c) an organic coating on the zinc based alloy layer.
Claim 10
Dependent Claim
24 words
The fastener of claim 7 wherein said micro-throwing nickel based alloy layer (a) comprises zinc in an amount less than one (1) weight percent.
Claim 11
Dependent Claim
12 words
The fastener of claim 8 wherein said fastener comprises a drill screw.
Claim 12
Dependent Claim
88 words
A corrosion resistant drill screw fastener having a ferrous metal substrate and, in sequence, the following layers over said substrate: (a) a micro-throwing nickel based alloy plating containing less that 3 weight percent zinc and of at least 0.00005 in. thickness on the substrate; (b) a zinc based alloy plating containing from about 85 to 92 weight percent zinc and from about 8 to 15 weight percent nickel on the nickel based alloy layer; and (c) an organic coating of electrophoretic paint on the zinc based alloy layer.
Claim 13
Dependent Claim
88 words
A corrosion resistant drill screw fastener having a ferrous metal substrate and, in sequence, the following layers over said substrate: (a) a micro-throwing nickel based alloy plating containing less that 3 weight percent zinc and of at least 0.00005 in. thickness on the substrate; (b) a zinc based alloy plating containing from about 85 to 92 weight percent zinc and from about 8 to 15 weight percent nickel on the nickel based alloy layer; and (c) an organic coating of electrophoretic paint on the zinc based alloy layer.
Claim 14
Dependent Claim
22 words
The fastener of claim 10 wherein said nickel based alloy layer (a) comprises zinc in an amount less than 1 weight percent.
Claim 15
Dependent Claim
18 words
The fastener of claim 10 wherein said nickel based plating layer (a) is greater than 0.0001 in. thickness.
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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) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |