Patent US3639149A successfully refreshed from Google Patents.
US3639149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite laminate of water-extended unsaturated polyester
Assignee: Wyeth Holdings LLC
•
Filing: 1970-10-28
•
Granted: 1972-02-01
•
Expires: 1990-10-28
Abstract
Abstract A process for producing a laminated article that is either flat or thermoformed comprising prime coating a thermoformable or thermoformed flexible thermoplastic sheet with a neat unsaturated polyester resin composition and depositing on said prime coating at least one layer of fiberglass reinforced water-extended polyester resin composition and permitting the two polyester resins to convert to the thermoset state.
Inventors
- 👤 Richard Elliot Thornt Spalding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:58
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; C; C08; C08F; C08F290/00; C08F290/02; C08F290/06; C08F290/061; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
The process according to claim 1 in which the thermoplastic sheet is a physical blend of (A) 70-95 percent of a hard resinous terpolymer composed of from about 67-72 parts of methyl methacrylate, 18-22 parts of styrene and 8-12 parts of acrylonitrile and (B) 5- 30 percent by weight of polybutadiene grafted with from about 76-80 parts of methyl methacrylate, 17-21 parts of styrene and 1-5 parts of acrylonitrile wherein the ratio of the polybutadiene to monomer in (B) ranges from about 2:1 to about 3:1 respectively.
Claim 2
Dependent Claim
19 words
The process according to claim 1 in which the thermoplastic sheet is thermoformed before the prime coating is applied.
Claim 3
Dependent Claim
22 words
The process according to claim 1 in which the thermoplastic sheet is flat and not thermoformed before the prime coating is applied.
Claim 4
Dependent Claim
19 words
The process according to claim 2 in which the thermoplastic sheet is thermoformed before the prime coating is applied.
Claim 5
Dependent Claim
20 words
The process according to claim 2 in which the thermoplastic sheet is not thermoformed before the prime coating is applied.
Claim 6
Dependent Claim
22 words
The process according to claim 1 in which the original thickness of the thermoformable sheet is between about one-fourth and five-eighths inch.
Claim 7
Dependent Claim
21 words
The process according to claim 4 in which the thickness of the thermoplastic sheet is between about 5 and 50 mils.
Claim 8
Dependent Claim
25 words
The process according to claim 3 in which the thermoplastic sheet after the thermoforming step has been accomplished, is between about 5 and 50 mils.
Claim 9
Dependent Claim
77 words
A laminate comprising a thermoformed flexible, comparatively rigid thermoplastic sheet having on one side a prime coating of a neat unsaturated polyester resin composition containing a polymerizable compound having a polymerizable group, and at least one layer of fiberglass reinforced, water-extended unsaturated polyester resin composition containing polymerizable compound having a polymerizable group deposited on said prime coating, wherein all of said polyester compositions are in the thermoset state and all layers are securely bonded to one another.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |