US3889035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber-reinforced plastic articles
Assignee: Marling Ind Ltd
•
Filing: 1972-11-27
•
Granted: 1975-06-10
•
Expires: 1992-11-27
Abstract
Abstract A mouldable sheet material consists of a mass of glass fiberreinforced incompletely polymerized thermosetting resin, such as a polyester or epoxy resin, containing intermediately of the sheet a web of knitted glass-fiber fabric which controls the flow of the reinforcing fibers during moulding. There may be more than one knitted web, the webs being spaced from one another and from the sheet surface. The fibers nearer the surface may be of finer gauge than those deeper within the sheet. The two classes of fibers may be separated by a knitted web. Layers of different kinds may be held together by dispersed particles of thermoset resin or by threads drawn through by needling. A strippable protective layer may be applied to one or both faces of the sheet.
Inventors
- 👤 John Harry Jakes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:01
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B32B2305/00; B32B2305/10; B32B2305/18; B32B2305/182; B32B2315/00; B32B2315/08; B32B2315/085; B32B2327/00; B32B2327/06; B32B2367/00; Y; Y10; Y10T; Y10T442/00; Y10T442/40; Y10T442/494
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
99 words
A MOLDABLE SHEET MATERIAL, COMPRISING A. A MASS OF INCOMPLETELY POLYMERIZED THERMOSETTING RESIN, B. AT LEAST ONE CONTINUOUS WEB OF STRETCHABLE GLASS FIBER KNITTED FABRIC CONTAINED WITHIN AND EXTENDING LONGITUDINALLY OF SAID RESIN MASS: C. FIRST LAYERS OF RANDOMLY ARRANGED GLASS FIBERS DISPOSED ON OPPOSITE SIDES OF SAID FABRIC, RESPECTIVELY, FOR SPACING SAID FABRIC FROM THE MAJOR FACES OF SAID SHEET MATERIAL, AND D. A PLURALITY OF REINFORCING GLASS FIBERS PASSING THROUGH SAIDD FABRIC WITH THE ENDS OF SAID REINFORCING FIBERS LOCKED IN NORMAL ARRANGEMENT TO THE GLASS FIBER LAYER SURFACES, THEREBY TO SECURE TOGETHER SAID GLASS FIBER LAYERS.
Claim 2
Dependent Claim
99 words
A MOLDABLE SHEET MATERIAL, COMPRISING A. A MASS OF INCOMPLETELY POLYMERIZED THERMOSETTING RESIN, B. AT LEAST ONE CONTINUOUS WEB OF STRETCHABLE GLASS FIBER KNITTED FABRIC CONTAINED WITHIN AND EXTENDING LONGITUDINALLY OF SAID RESIN MASS: C. FIRST LAYERS OF RANDOMLY ARRANGED GLASS FIBERS DISPOSED ON OPPOSITE SIDES OF SAID FABRIC, RESPECTIVELY, FOR SPACING SAID FABRIC FROM THE MAJOR FACES OF SAID SHEET MATERIAL, AND D. A PLURALITY OF REINFORCING GLASS FIBERS PASSING THROUGH SAIDD FABRIC WITH THE ENDS OF SAID REINFORCING FIBERS LOCKED IN NORMAL ARRANGEMENT TO THE GLASS FIBER LAYER SURFACES, THEREBY TO SECURE TOGETHER SAID GLASS FIBER LAYERS.
Claim 3
Dependent Claim
34 words
The material claimed in claim 1 wherein two webs of knitted glass fiber fabric are respectively interposed between opposed faces of a layer of coarser glass fibers and respective layers of finer glass fibers.
Claim 4
Dependent Claim
48 words
The material claimed in claim 1 wherein a web of knitted glass fiber fabric is disposed between two layers of coarser glass fibers and a layer of finer glass fibers is interposed between one at least of said layers of coarser fibers and a surface of the sheet.
Claim 5
Dependent Claim
31 words
The material claimed in claim 3 wherein a layer of finer glass fibers is interposed between each of said layers of coarser glass fibers and the respective surface of the sheet.
Claim 6
Dependent Claim
45 words
The material claimed in claim 1 wherein a web of knitted glass fiber fabric disposed centrally within said sheet has on either side thereof a layer of coarser glass fibers, a further web of knitted glass fiber fabric and a layer of finer glass fibers.
Claim 7
Dependent Claim
20 words
The material claimed in claim 1 and having a strippable protective layer applied to one or to both surfaces thereof.
Claim 8
Dependent Claim
29 words
The product defined in claim 1, wherein said sheet material includes at least two layers of said glass fiber web separated by a layer of randomly arranged glass fibers.
Claim 9
Dependent Claim
38 words
A material as defined in claim 1, and further including adjacent at least one major face of the sheet material a second layer of randomly arranged glass fibers which are finer than the fibers of said first layer.
Claim 10
Dependent Claim
25 words
A material as defined in claim 1, and further including a layer of strippable protective material applied to a major face of said sheet material.
Claim 11
Dependent Claim
20 words
A mouldable sheet material in accordance with claim 9 and having a strippable protective layer applied to each surface thereof.
Claim 12
Dependent Claim
26 words
A mouldable sheet material in accordance with claim 9 wherein said strippable layer presents to said material a surface of polyethylene, regenerated cellulose or polyvinyl alcohol.
Claim 13
Dependent Claim
28 words
A material as defined in claim 1, wherein the fibers of one of said first layers are coarser than the fibers of the other of said first layers.
References Cited (Backward Citations)
US1529701A
Cited
US1574496A
Cited
US2339431A
Cited
US2543101A
Cited
US2577205A
Cited
US2805181A
Cited
US2794759A
Cited
US2800423A
Cited
US2959511A
Cited
US2995781A
Cited
US3210230A
Cited
US3608166A
Cited
US3684645A
Cited
US3713962A
Cited
US3684284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |