US4260445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing thick reinforced plastic articles
Assignee: Sekisui Chemical Co Ltd
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Filing: 1978-08-08
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Granted: 1981-04-07
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Expires: 1998-08-08
Abstract
Abstract A process for producing a thick reinforced plastic article by laminating unit layers of a molding material composed of a thermosetting resin and a reinforcing material, which comprises scattering fibers on the surface of an earlier disposed unit layer while it is in the uncured state, then curing the unit layer, and laminating the next layer on the cured unit layer.
Inventors
- 👤 Masakatsu Mayumi
- 👤 Kenji Mitooka
- 👤 Sigeharu Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:03
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B29; B29C; B29C37/00; B29C37/0078; B29C37/0082; B29C67/00; B29C67/24; B29C67/242; B29C67/243; B29C70/00; B29C70/02; B29C70/021; B29C70/025; B29C70/04; B29C70/06; B29C70/10; B29C70/12; B29C70/28; B29C70/54; B29C70/543; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/36; B32B5/28; F; F16; F16L; F16L47/00; F16L47/26; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/10; B32B2262/101; B32B2305/00; B32B2305/08; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1372; Y10T428/23907; Y10T428/23914; Y10T428/31504; Y10T428/31551; Y10T428/31616
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A process for producing a thick reinforced plastic article by laminating unit layers of a molding material composed of a thermosetting resin and a reinforcing material, which comprises scattering fibers on the surface of an earlier disposed unit layer while it is in the uncured state, then curing the unit layer whereby at least a portion of the fibers have exposed free ends, and laminating a second layer which is in the uncured state, on the cured unit layer and then curing said second layer, whereby said free ends become fixed within said second layer.
Claim 2
Dependent Claim
95 words
A process for producing a thick reinforced plastic article by laminating unit layers of a molding material composed of a thermosetting resin and a reinforcing material, which comprises scattering fibers on the surface of an earlier disposed unit layer while it is in the uncured state, then curing the unit layer whereby at least a portion of the fibers have exposed free ends, and laminating a second layer which is in the uncured state, on the cured unit layer and then curing said second layer, whereby said free ends become fixed within said second layer.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the fibers are of glass and are scattered in an amount of 0.1 to 2 g, per 100 cm 2 of unit layer.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein the glass fibers have a length of 2 to 50 mm.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein the molding material is a glass fiber mat impregnated with an unsaturated polyester resin.
Claim 6
Dependent Claim
30 words
The process of claim 1 wherein the molding material is a resin mortar obtained by mixing an unsaturated polyester resin with sand or both sand and fibers or a filler.
Claim 7
Dependent Claim
25 words
The process of claim 2 wherein the fibers are employed in an amount of 0.3 to 0.8 g per 100 cm 2 of unit layer.
Claim 8
Dependent Claim
17 words
The process of claim 3 wherein the glass fibers have a length of 5 to 20 mm.
References Cited (Backward Citations)
US3547726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |