Patent US3867221A successfully refreshed from Google Patents.
US3867221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparing an article of thermosetting resin
Assignee: Individual
•
Filing: 1973-04-16
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Granted: 1975-02-18
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Expires: 1993-04-16
Abstract
Abstract In the process for making a thermosetting resin article which comprises (a) impregnating an open-cell sheet with a thermosetting resin (b) applying a fibrous layer to at least one side of the sheet, (c) compressing the assembly so that the resin impregnates the fibrous layer, and (d) allowing the assembly to cure, the improvement comprising (e) allowing the resin in the fibrous layer to pass through a more advanced state of cure than the resin in the compressed sheet (f) reducing the compression on the sheet so that it expands and (g) allowing the assembly to cure throughout. Also a part of this invention is the thermosetting article made by this process.
Inventors
- 👤 Peter R Chant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:06
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/003; B32; B32B; B32B5/00; B32B5/18; B32B5/22; B32B5/24; B32B5/245; B29K; B29K2309/00; B29K2309/08; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/249999; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31536
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
159 words
IN THE PROCESS OF PRODUCING AN ARTICLE OF THERMOSETTING RESIN WHICH COMPRISES: A. IMPREGNATING A FLEXIBLE, COMPRESSIBLE SHEET HAVING AN OPEN-CELL FOAM STRUCTURE WITH A CURABLE THERMOSETTING RESIN, B. APPLYING A LAYER OF FIBROUS REINFORCING LAYER TO AT LEAST ONE SIDE OF THE IMPREGNATED SHEET, C. COMPRESSING THE IMPREGNATED SHEET AND REINFORCING LAYER TO THE EXTENT THAT RESIN IS EXPELLED FROM THE SHEET INTO THE FIBROUS REINFORCING LAYER TO IMPREGNATE THIS LAYER WITH RESIN THROUGHOUT ITS THICKNESS, AND D. HEATING THE RESIN IN THE SHEET AND LAYER TO CURE WHILE MAINTAINING THE COMPRESSION, THE IMPROVEMENT COMPRISING; E. WHEREIN THE HEATING IN (D) IS GREATER IN THE REINFORCING LAYER AND THE RESIN PASSES THROUGH A MORE ADVANCED STATE OF CURE THAN THE RESIN IN THE IMPREGNATED SHEET, F. REDUCING THE COMPRESSION ON THE PARTIALLY CURED RESIN IMPREGNATED FOAM SHEET AND REINFORCING LAYER TO EXPAND THE SAME, AND G. HEATING THE FOAM SHEET AND REINFORCING LAYER TO COMPLETELY CURE THE RESIN.
Claim 2
Dependent Claim
159 words
IN THE PROCESS OF PRODUCING AN ARTICLE OF THERMOSETTING RESIN WHICH COMPRISES: A. IMPREGNATING A FLEXIBLE, COMPRESSIBLE SHEET HAVING AN OPEN-CELL FOAM STRUCTURE WITH A CURABLE THERMOSETTING RESIN, B. APPLYING A LAYER OF FIBROUS REINFORCING LAYER TO AT LEAST ONE SIDE OF THE IMPREGNATED SHEET, C. COMPRESSING THE IMPREGNATED SHEET AND REINFORCING LAYER TO THE EXTENT THAT RESIN IS EXPELLED FROM THE SHEET INTO THE FIBROUS REINFORCING LAYER TO IMPREGNATE THIS LAYER WITH RESIN THROUGHOUT ITS THICKNESS, AND D. HEATING THE RESIN IN THE SHEET AND LAYER TO CURE WHILE MAINTAINING THE COMPRESSION, THE IMPROVEMENT COMPRISING; E. WHEREIN THE HEATING IN (D) IS GREATER IN THE REINFORCING LAYER AND THE RESIN PASSES THROUGH A MORE ADVANCED STATE OF CURE THAN THE RESIN IN THE IMPREGNATED SHEET, F. REDUCING THE COMPRESSION ON THE PARTIALLY CURED RESIN IMPREGNATED FOAM SHEET AND REINFORCING LAYER TO EXPAND THE SAME, AND G. HEATING THE FOAM SHEET AND REINFORCING LAYER TO COMPLETELY CURE THE RESIN.
Claim 3
Dependent Claim
15 words
A process as in claim 1 wherein the open-celled compressible sheet is a polyurethane foam.
Claim 4
Dependent Claim
21 words
A process as in claim 2 wherein at least 25 percent of the open cell space is filled with thermosetting resin.
Claim 5
Dependent Claim
15 words
A process as in claim 1 wherein the thermosetting resin is an epoxy resin composition.
References Cited (Backward Citations)
GB1266097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |