Augmented curing of reinforced plastic stock
Abstract
Abstract A pultrusion machine and process wherein a composite fibre strand is pulled through successive stages of impregnation, curing, and forming. At the impregnation stage liquid thermosetting resin is mixed with hardener and the fiber strands is saturated with the mixture and rough formed. During the initial curing stage a cure is started throughout the resin mixture by use of electrical wave energy. Before final curing, the saturated strand is pulled through the finish die where it is externally heated and wherein the saturated strand is given its final cross-sectional shape and external finish, and cured to completion immediately prior to final emergence at the exit end of the finish die.
Inventors
- 👤 William Brandt Goldsworthy
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |