US3637459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural panel having foam plastic core
Assignee: Dow Chemical Co
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Filing: 1970-03-17
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Granted: 1972-01-25
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Expires: 1990-03-17
Abstract
Abstract Laminated panels of improved stability and wide utility are obtained by employing a styrene-maleic anhydride copolymer as a foamed core of the panel. The copolymer is a uniform copolymer of from 85 to 65 weight percent styrene and 15 to 35 weight percent maleic anhydride.
Inventors
- 👤 Hal G Parish
- 👤 Albert J Palfrey
- 👤 Eugene R Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:16
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/16; C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/24; E04C2/243; E04D3/00; E04D3/35; E04D3/351; E04D3/352; F; F16; F16L; F16L59/00; F16L59/14; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249985; Y10T428/249987; Y10T428/24999; Y10T428/249991; Y10T428/249992; Y10T428/26; Y10T428/31504; Y10T428/31511; Y10T428/31515
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
20 words
The panel of claim 1 wherein the second face of the core has a second skin member rigidly affixed thereto.
Claim 2
Dependent Claim
13 words
The panel of claim 1 wherein the skin member is a metal sheet.
Claim 3
Dependent Claim
18 words
The panel of claim 1 wherein the solution viscosity of the polymer is from 3 to 9 centipoise.
Claim 4
Dependent Claim
14 words
The panel of claim 1 wherein the panel is adhesively bonded to the core.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |