US3645838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid multilayer formed sheet structures
Assignee: Dow Chemical Co
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Filing: 1970-02-02
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Granted: 1972-02-29
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Expires: 1990-02-02
Abstract
Abstract This invention provides economical multilayer sheets that combine high-barrier layers with layers of rigid polyvinyl chloride or impact polystyrene.
Inventors
- 👤 Ritchey O Newman Jr
- 👤 Walter J Schrenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:29
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B1/00; B32B27/18; B32B27/30; B32B27/302; B32B27/304; B32B7/00; B32B7/04; B32B7/12; B32B2439/00; B32B2439/70; B32B2439/80; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31826; Y10T428/31833; Y10T428/31837; Y10T428/31855; Y10T428/31909; Y10T428/31924; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
30 words
The rigid multilayer sheet of claim 1 wherein a copolymer of ethylene and vinyl acetate is blended with said block copolymer of styrene and butadiene to form said glue layers.
Claim 2
Dependent Claim
29 words
The rigid multilayer sheet of claim 1 wherein a copolymer of ethylene and ethylacrylate is blended with said block copolymer of styrene and butadiene to form said glue layers.
Claim 3
Dependent Claim
30 words
The rigid multilayer sheet of claim 1 wherein a copolymer of ethylene and isobutyl acrylate is blended with said block copolymer of styrene and butadiene to form said glue layers.
Claim 4
Dependent Claim
28 words
The rigid multilayer sheet of claim 1 wherein a polymer of chlorinated polyethylene is blended with said block copolymer of styrene and butadiene to form said glue layers.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |