US3607530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of glass-reinforced polyester sheets
Assignee: Ashland LLC
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Filing: 1967-12-13
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Granted: 1971-09-21
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Expires: 1987-12-13
Abstract
Abstract A method for the preparation of clear or transparent glassreinforced plastic sheets or panels using a mixture of two different resins in controlled proportions. Rigid fiberglassreinforced polyester panels (e.g., corrugated or decorative), having a negligible glass pattern when observed with the unaided eye, can be prepared in this manner. Such glass panels have a uniform appearance and can be made substantially clear or transparent.
Inventors
- 👤 Robert E Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:08
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/244; C08J2367/00; C08J2367/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
A process for preparing laminates or panels which contain embedded glass-reinforcing fibers or filaments, which comprises: forming a mixture consisting essentially of two polyester resin syrups by mixing two such polyester resin syrups each of which polyester resin syrups contains a polymerizable unsaturated polyester and a copolymerizable monomer, wherein one of said polyester resin syrups when cured has a refractive index below the refractive index of said glass-reinforcing fibers or filaments and one of said polyester resin syrups when cured has a refractive index above the refractive index of said glass-reinforcing elements, and wherein the mixture of polyester resin syrups when cured has a refractive index which forming a composite by combining the mixture of polyester resin syrups with said glass-reinforcing fibers or filaments; molding or casting said composite to form said laminates or panels.
Claim 2
Dependent Claim
135 words
A process for preparing laminates or panels which contain embedded glass-reinforcing fibers or filaments, which comprises: forming a mixture consisting essentially of two polyester resin syrups by mixing two such polyester resin syrups each of which polyester resin syrups contains a polymerizable unsaturated polyester and a copolymerizable monomer, wherein one of said polyester resin syrups when cured has a refractive index below the refractive index of said glass-reinforcing fibers or filaments and one of said polyester resin syrups when cured has a refractive index above the refractive index of said glass-reinforcing elements, and wherein the mixture of polyester resin syrups when cured has a refractive index which forming a composite by combining the mixture of polyester resin syrups with said glass-reinforcing fibers or filaments; molding or casting said composite to form said laminates or panels.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the polymerizable unsaturated polyester is an unsaturated linear polyester and wherein the copolymerizable monomer is styrene.
References Cited (Backward Citations)
US2794759A
Cited
US2830648A
Cited
US3244580A
Cited
US3155567A
Cited
US3344014A
Cited
US3413188A
Cited
US3447999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |