Patent US3607530A successfully refreshed from Google Patents.
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 08:47
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)
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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 |