US3615969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed-core laminates
Assignee: Larson Industries Inc
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Filing: 1968-05-20
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Granted: 1971-10-26
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Expires: 1988-05-20
Abstract
Abstract Foamed-core laminates or sandwiches useful in the construction of pleasure boats comprise one or more layers of plastic foam sandwiched between layers of reinforced polyester. The laminates can be prepared by spraying a liquid, foam-producing substance on one side of a reinforced polyester skin or shell and thereafter spraying a thin coating of polyester over the previously applied foam while the foam is hardening and still tacky. This polyester coating forms an adherent skin on the foam and acts to firmly bond the final layer of reinforced polyester (when such is applied) to the foam core.
Inventors
- 👤 Allan B Hegg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:18
CPC Classifications
B; B63; B63B; B63B7/00; B63B7/06; B32; B32B; B32B27/00; B63B5/00; B63B5/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
13 words
Processes of claim 1 wherein the first and second skins are polyester skins.
Claim 2
Dependent Claim
47 words
Processes of claim 2 wherein: a. the first skin is a glass reinforced, air inhibited polyester resin skin; b. the second skin is a glass reinforced polyester skin; and c. the foam-producing agent is applied to the first skin while the air-inhibited polyester resin is still tacky.
Claim 3
Dependent Claim
12 words
Processes of claim 3 wherein said plastic foam is a polyester foam.
Claim 4
Dependent Claim
12 words
Processes of claim 3 wherein said plastic foam is a polyurethane foam.
Claim 5
Dependent Claim
33 words
Processes of claim 5 wherein said thin coating of polyester is applied by spraying with sufficient force to cause some sprayed droplets of polyester resin to penetrate the crust of the tacky foam.
Claim 6
Dependent Claim
10 words
Processes of claim 6 wherein a boat hull is produced.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |