Patent US4802807A successfully refreshed from Google Patents.
US4802807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threaded fastener
Assignee: Illinois Tool Works Inc
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Filing: 1988-04-14
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Granted: 1989-02-07
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Expires: 2008-04-14
Abstract
Abstract A compositely plated, threaded fastener has zinc plating applied to a threaded fastener core and an aluminum plating is applied to the zinc underplating. Optionally, a polymeric top coat can be applied to the aluminum plating for pigmented appearance. The combination of the composite aluminum and zinc platings not only provide the fasteners with improved corrosion resistance but also provide particularly reduced torque load in driving such fasteners, for example, in drilling applications.
Inventors
- 👤 Mark Offenburger
- 👤 Eric Parker
- 👤 Frank Ptak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:07
CPC Classifications
F; F16; F16B; F16B25/00; C; C23; C23C; C23C28/00; C23C28/02; C23C28/023; C23C28/025; C23C14/00; C23C14/06; C23C14/14; C23C14/16; F16B25/001; F16B25/0021; F16B25/10; F16B25/103; F16B33/00; F16B33/008; F16B33/06; Y; Y10; Y10S; Y10S411/00; Y10S411/90; Y10S411/901; Y10S411/902; Y10S411/914
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
60 words
A threaded fastener having improved driving performance for corrosion-resistant securement of one or more metallic work pieces, said fastener comprising: a drive head; and a composite threaded shank comprising a threaded inner core; a zinc plating applied to said core; and an aluminum plating applied on said zinc plating, to promote lubricity in driving said shank into said work pieces.
Claim 2
Dependent Claim
60 words
A threaded fastener having improved driving performance for corrosion-resistant securement of one or more metallic work pieces, said fastener comprising: a drive head; and a composite threaded shank comprising a threaded inner core; a zinc plating applied to said core; and an aluminum plating applied on said zinc plating, to promote lubricity in driving said shank into said work pieces.
Claim 3
Dependent Claim
13 words
The fastener according to claim 1 wherein said shank has a drilling configuration.
Claim 4
Dependent Claim
22 words
The fastener according to claim 1 wherein said shank has a top layer of polymeric coating material applied on said aluminum plating.
Claim 5
Dependent Claim
21 words
The fastener according to claim 1 wherein said aluminum plating is applied by ionized aluminum vapor deposition on said zinc plating.
Claim 6
Dependent Claim
23 words
The fastener according to claim 1 wherein said zinc plating has a thickness in the range of about 0.0002 to about 0.0010 inch.
Claim 7
Dependent Claim
23 words
The fastener according to claim 1 wherein said zinc plating has a thickness in the range of about 0.0003 to about 0.0005 inch.
Claim 8
Dependent Claim
23 words
The fastener according to claim 1 wherein said aluminum plating has a thickness in the range of about 0.00005 to about 0.00015 inch.
Claim 9
Dependent Claim
23 words
The fastener according to claim 1 wherein said aluminum plating has a thickness in the range of about 0.00005 to about 0.0010 inch.
Claim 10
Dependent Claim
23 words
The fastener according to claim 1 wherein said aluminum plating has a thickness in the range of about 0.0001 to about 0.00015 inch.
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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |