US4028477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing an article of thermosetting resin
Assignee: Shell USA Inc
•
Filing: 1975-03-06
•
Granted: 1977-06-07
•
Expires: 1995-03-06
Abstract
Abstract The present invention provides a process for making a thermosetting resin article which comprises (a) impregnating a compressible opencell sheet with a thermosetting resin (b) applying a fibrous layer to at least one side of the sheet, (c) allowing the assembly to cure. The invention further is directed to thermosetting articles made by this process.
Inventors
- 👤 Johan M. Goppel
- 👤 Peter R. Chant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:47
CPC Classifications
B; B32; B32B; B32B38/00; B32B38/08; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/086; B29C70/28; B29C70/40; B29C70/42; B29C70/46; B29C70/467; B29C70/50; C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/405; B29C70/504; B29C70/52; B29K; B29K2105/00; B29K2105/04; B29K2105/045; B29K2105/06; B29K2305/00; B29K2309/00; B29K2309/08; B29K2309/12; B29K2311/00; B29K2311/10; B29K2311/12; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/249999; Y10T428/31504; Y10T428/31511; Y10T442/00; Y10T442/60; Y10T442/647; Y10T442/651; Y10T442/652
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
57 words
A rigid laminated article comprising a dense compressed cellular foam core interposed between fibrous layers uniformly impregnated throughout their respective thickness with a hardened thermosetting resin, said foam core having substantially all of the open cell space therein filled with a hardened thermosetting resin and being bound to said resin-impregnated fibrous layers through said hardened thermosetting resin.
Claim 2
Dependent Claim
57 words
A rigid laminated article comprising a dense compressed cellular foam core interposed between fibrous layers uniformly impregnated throughout their respective thickness with a hardened thermosetting resin, said foam core having substantially all of the open cell space therein filled with a hardened thermosetting resin and being bound to said resin-impregnated fibrous layers through said hardened thermosetting resin.
Claim 3
Dependent Claim
13 words
The laminate of claim 1 wherein the foam core is a polyurethane foam.
Claim 4
Dependent Claim
13 words
The laminate of claim 1 wherein the thermosetting resin is an epoxy resin.
Claim 5
Dependent Claim
13 words
The laminate of claim 1 wherein the fibrous layers are glass fiber mats.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |