Composite reinforced plastic pipe
Abstract
Abstract A METHOD FOR FORMING BELL AND SPIGOT FITTINGS ON A REINFORCED PLASTIC PIPE IN WHICH THE BELL FITTING IS FORMED BY BUILDING UP A REINFORCED PLASTIC WALL STRUCTURE ON A MANDREL CONFIGURED TO PRODUCE A GENERALLY TUBULAR PIPE PORTION AND AN OUTWARDLY EXPANDED BELL HOUSING PORTION. THE SPIGOT FITTING IS THEN FORMED ABOUT THE WALL STRUCTURE OF THE PIPE BY SUITABLE LOCATION OF THE BELL PORTION OF THE MANDREL. BY APPROPRIATE LOCATION AND CONFIGURATION OF THE SPIGOT FORMING MOLDS, IT IS POSSIBLE TO FORM MORE THAN ONE COMPLETE PIPE SEGMENT ON ONE MANDREL. FURTHER, CERTAIN ADVANTAGES MAY BE OBTAINED IF THE SAME RESIN USED TO FORM THE REINFORCED PLASTIC WALL STRUCTURE IS USED TO FORM THE SPIGOT FITTING AND IN ADDITION OTHER ADVANTAGES MAY BE OBTAINED IF THE WALL STRUCTURE AND THE SPIGOT STRUCTURE ARE CURED SIMULTANEOUSLY.
Inventors
- 👤 James L Grosh
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |