US4964774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated metal fastener
Assignee: Illinois Tool Works Inc
•
Filing: 1989-09-29
•
Granted: 1990-10-23
•
Expires: 2009-09-29
Abstract
Abstract A metal fastener, suitable for use in wood construction and coated with a polymeric residue produced by removing water from an aqueous dispersion of a film-forming, thermoplastic, predominately aliphatic polyurethane resin, thereby to reduce penetration force, increase withdrawal force, and protect against corrosion. Before the polyurethane coating is applied, a zinc layer is applied so as to coat the fastener, and a chromate conversion layer is applied so as to coat the zinc layer.
Inventors
- 👤 Geronimo E. Lat
- 👤 Willaim L. Gabriel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:51
CPC Classifications
F; F16; F16B; F16B15/00; F16B15/0092; C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C28/00; C23C28/30; C23C28/32; C23C28/322; C23C28/3225; C23C28/34; C23C28/345; F16B15/0015; F16B15/0023; F16B15/08; Y; Y10; Y10S; Y10S411/00; Y10S411/90; Y10S411/901; Y10S411/902; Y10S411/903
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
56 words
A metal fastener suitable for use in wood construction, having a thermoplastic, predominately aliphatic polyurethane coating over substantially its entire metal surface, and provided with a zinc layer and a chromate conversion layer between said polyurethane coating and the metal surface of the fastener, said zinc layer being contiguous with the metal surface of the fastener.
Claim 2
Dependent Claim
56 words
A metal fastener suitable for use in wood construction, having a thermoplastic, predominately aliphatic polyurethane coating over substantially its entire metal surface, and provided with a zinc layer and a chromate conversion layer between said polyurethane coating and the metal surface of the fastener, said zinc layer being contiguous with the metal surface of the fastener.
Claim 3
Dependent Claim
14 words
The metal fastener in accordance with claim 1 wherein said polyurethane coating is continuous.
Claim 4
Dependent Claim
14 words
The metal fastener in accordance with claim 1 wherein said polyurethane coating is discontinuous.
Claim 5
Dependent Claim
25 words
The metal fastener in accordance with claim 1 wherein the zinc layer has a thickness in the range of about 0.2 to about 0.6 mil.
Claim 6
Dependent Claim
34 words
The metal fastener in accordance with claim 1 wherein the polyurethane coating overlying the zinc layer and the chromate conversion layer has a thickness in the range of about 0.2 to about 2 mils.
Claim 7
Dependent Claim
28 words
The metal fastener in accordance with claim 1 wherein the polyurethane coating overlying the zinc layer and the chromate conversion layer has a thickness of about 0.5 mil.
Claim 8
Dependent Claim
12 words
The metal fastener in accordance with claim 1 which is a nail.
Claim 9
Dependent Claim
12 words
The metal fastener in accordance with claim 1 which is a staple.
Claim 10
Dependent Claim
13 words
The metal fastener in accordance with claim 1 which is a truss plate.
Claim 11
Dependent Claim
14 words
The metal fastener in accordance with claim 1 wherein the metal is carbon steel.
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) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |