Patent US4752497A successfully refreshed from Google Patents.
US4752497A
Expired / Lapsed
US
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Method of applying an impact resistant moisture impermeable resinous coating
Assignee: DRESSER-SHAW Co (A NOVA SCOTIA UNLIMITED LIABILITY CORPORATION)
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Filing: 1986-05-29
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Granted: 1988-06-21
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Expires: 2006-05-29
Abstract
Abstract A method of forming an impact-resistant, moisture impermeable coating on the surface of an object, such as a pipe, comprises heating the object to a temperature above which a thermosetting resin applied to the heated surface will fuse, so that the resin forms a continuous layer. Before the layer of resin has gelled, a second layer consisting of a finely divided particulate mixture of the resin and a solid such as glass fiber or mica is applied over the first layer. The two layers are fused together to form a homogeneous resin covering with one layer reinforced by the above solid. The resin coating is then cured and the object allowed to cool. An apparatus for carrying out the method is also described.
Inventors
- 👤 Stephen E. McConkey
- 👤 Gordon G. Macphail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:44
CPC Classifications
B; B05; B05D; B05D1/00; B05D7/00; B05D7/14; B05D7/146; B05D5/00; B05D5/02; F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; F16L58/10; F16L58/1054; F16L58/1072
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
A method of forming an impact resistant moisture impermeable resinous coating on the surface of a metallic object which comprises applying a thermosetting resin onto said surface, the surface having been heated to a temperature above the fusion temperature of the resin, the resin being fused thereon to form a first continuous layer, applying onto said layer before it has gelled a finely divided mixture consisting of said resin and a particulate inorganic solid selected from the group consisting of glass fibres and mica flakes to form a second continuous layer covering the first layer, the layers fusing together to form a homogeneous resin covering with the particulate solid reinforcing the second layer, and cooling and curing the applied resin.
Claim 2
Independent Claim
120 words
A method of forming an impact resistant moisture impermeable resinous coating on the surface of a metallic object which comprises applying a thermosetting resin onto said surface, the surface having been heated to a temperature above the fusion temperature of the resin, the resin being fused thereon to form a first continuous layer, applying onto said layer before it has gelled a finely divided mixture consisting of said resin and a particulate inorganic solid selected from the group consisting of glass fibres and mica flakes to form a second continuous layer covering the first layer, the layers fusing together to form a homogeneous resin covering with the particulate solid reinforcing the second layer, and cooling and curing the applied resin.
Claim 3
Dependent Claim
20 words
A method according to claim 1, wherein the resin of said first and second layers is applied in powdered form.
Claim 4
Dependent Claim
23 words
A method according to claim 2, wherein the resin of said first layer and said finely divided mixture are applied by electrostatic spraying.
Claim 5
Dependent Claim
29 words
A method according to claim 1, wherein the metallic object is a cylindrical pipe, the pipe being rotated continuously about its axis during said application, cooling and curing steps.
Claim 6
Dependent Claim
13 words
A method according to claim 1, wherein the resin is an epoxy resin.
References Cited (Backward Citations)
US3177902A
Cited
US3208868A
Cited
US3490934A
Cited
US3708321A
Cited
US3904346A
Cited
SU502660A1
Cited
US4142555A
Cited
US4138516A
Cited
US4158371A
Cited
US4405727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |