US4517323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded products
Assignee: Owens Corning Fiberglas Technology Inc
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Filing: 1981-07-20
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Granted: 1985-05-14
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Expires: 2001-07-20
Abstract
Abstract Improved surface characteristics of sheet molding compounds are obtained by employing defined amounts of resin, glass and filler in the formulation comprising the appearance side and the reinforcing side of molded objects.
Inventors
- 👤 Larry W. Ferguson
- 👤 Roger A. McFarland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:14
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/02; B29C70/021; B29C70/025; C; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14; B29K; B29K2067/00; B29K2067/06; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/12; B29K2105/16; B29K2709/00; B29K2709/08; B29L; B29L2031/00; B29L2031/30; B29L2031/3055; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/659; Y10T442/67
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
215 words
A method for producing a molded object comprising an appearance surface and a reinforcing surface which comprises incorporating in the appearance surface an amount of unsaturated polymeric resin equal to from about 40 to about 50 volume percent of the total volume of the appearance surface, a volume of glass fibers equal to from about 28 to about 30 volume percent of the total volume of the appearance surface, a volume of filler equal to from about 28 to about 30 volume percent of the total volume of the appearance surface, the amount of glass fibers equal to from about 35 to about 42 weight percent of the total weight of the components comprising the appearance surface and incorporating in the reinforcing surface an amount of unsaturated polymeric resin equal to from about 40 to about 43 volume percent of the total volume of the reinforcing surface, a volume of glass equal to from about 16 to about 20 volume percent of the total volume of reinforcing surface, a volume of filler equal to from about 34 to about 40 volume percent of the total volume of the reinforcing surface, the amount of glass equal to from about 22 to about 28 weight percent of the total weight of the components comprising the reinforcing surface.
Claim 2
Independent Claim
215 words
A method for producing a molded object comprising an appearance surface and a reinforcing surface which comprises incorporating in the appearance surface an amount of unsaturated polymeric resin equal to from about 40 to about 50 volume percent of the total volume of the appearance surface, a volume of glass fibers equal to from about 28 to about 30 volume percent of the total volume of the appearance surface, a volume of filler equal to from about 28 to about 30 volume percent of the total volume of the appearance surface, the amount of glass fibers equal to from about 35 to about 42 weight percent of the total weight of the components comprising the appearance surface and incorporating in the reinforcing surface an amount of unsaturated polymeric resin equal to from about 40 to about 43 volume percent of the total volume of the reinforcing surface, a volume of glass equal to from about 16 to about 20 volume percent of the total volume of reinforcing surface, a volume of filler equal to from about 34 to about 40 volume percent of the total volume of the reinforcing surface, the amount of glass equal to from about 22 to about 28 weight percent of the total weight of the components comprising the reinforcing surface.
Claim 3
Dependent Claim
19 words
The method of claim 1 in which said filler is calcium carbonate having a particle less than 300 mesh.
Claim 4
Dependent Claim
14 words
The method of claim 1 in which said unsaturated polymeric resin comprises a polyester.
Claim 5
Dependent Claim
34 words
The method of claim 1 in which the glass fibers of said appearance surface are 2 inches in average length and the glass fibers of said reinforcing surface are 1/2 inch in average length.
Claim 6
Dependent Claim
20 words
The method of claim 1 in the same resins are employed in said appearance surface and in said reinforcing surface.
Claim 7
Dependent Claim
26 words
The method of claim 1 in which said object is molded at a pressure up to about 1200 psig for a period of about 10 seconds.
Claim 8
Dependent Claim
40 words
The method of claim 1 in which said appearance surface comprises about 41.4 volume percent resin, about 29.3 volume percent glass, about 29.3 volume percent filler, said glass comprising about 40 percent of the total weight of said appearance surface.
Claim 9
Dependent Claim
43 words
The method of claim 1 in which said reinforcing surface comprises about 41.4 volume percent resin, about 19.5 volume percent glass, about 39.1 volume percent filler, said glass comprising about 24 to about 26 percent of the total weight of said reinforcing surface.
Claim 10
Dependent Claim
10 words
A molded object produced by the method of claim 1.
References Cited (Backward Citations)
GB986566A
Cited
US3957943A
Cited
GB1406229A
Cited
US3903343A
Cited
GB1457935A
Cited
US4081578A
Cited
US4189517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |