USRE27973E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filament winding process
Assignee: —
•
Filing: 1972-08-28
•
Granted: 1974-04-16
•
Expires: 1992-08-28
Abstract
Abstract FILAMENT REINFORCED PLASTIC PIPE IS MADE BY AN IMPROVED PROCESS WHICH MINIMIZES THE LOSS OF REACTIVE, VOLATILE MONOMERS FROM THE THERMOSETTABLE RESIN COMPOSITION DURING THE CURE CYCLE. THE PROCESS CONSISTS OF GELLING THE RESIN BY SUBJECTING THE RESIN-FILAMENT LAYER TO A TEMPERATURE SUFFICIENT TO GELL THE RESIN WITHIN 5 INUTES AND THEN CURING THE RESIN AT THE NORMAL CURING TEMPERATURE.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:35
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/80; B29C53/84; B29C53/845; B29C2791/00; B29C2791/001; B29K; B29K2031/00; B29K2063/00; B29K2067/00; B29K2067/06; B29K2101/00; B29K2101/10
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) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |