US3589958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of filament reinforced sheet
Assignee: Dow Chemical Co
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Filing: 1969-05-01
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Granted: 1971-06-29
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Expires: 1989-05-01
Abstract
Abstract FILAMENT REINFORCED PLASTIC SHEET OF LAMINAR CONSTRUCTION IS PREPARED BY EXTRUDING A TUBE BY THE TRAPPED BUBBLE PROCESS, CENTRIFUGALLY DEPOSITING A FILAMENTARY REINFORCING MATERIAL ON THE INNER HEAT PLASTIFIED SURFACE OF THE BUBBLE AS IT IS EXTRUDED, COLLAPSING THE BUBBLE AND SEALING OPPOSED SURFACES TOGETHER, THEREBY ENTRAPPING THE FILAMENTARY REINFORCING.
Inventors
- 👤 Walter J Schrenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:30
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C2793/00; B29C2793/0063; B29C48/00; B29C48/001; B29C48/0013; B29C48/0015; B29C48/0018; B29C48/0019; B29C48/0022; B29C48/03; B29C48/05; B29C48/09; B29C48/10; B29C48/12; B29C48/13; B29C48/15; B29C48/154; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/36; B29C48/49; B29L; B29L2023/00; B29L2023/003
Claims Analysis
Total Claims: 0
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |