US3682749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the preparation of filament reinforced sheet
Assignee: Dow Chemical Co
•
Filing: 1970-09-24
•
Granted: 1972-08-08
•
Expires: 1990-09-24
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
2026-10-29 02:55
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C48/00; B29C48/001; B29C48/0018; B29C48/0019; B29C48/0022; B29C48/03; B29C48/05; B29C48/09; B29C48/10; B29C48/15; B29L; B29L2023/00; B29L2023/003; Y; Y10; Y10T; Y10T156/00; Y10T156/12; Y10T156/1317; Y10T156/1322; Y10T156/133; Y10T156/1335
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |