Patent US3554839A successfully refreshed from Google Patents.
US3554839A
Expired / Lapsed
US
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Filament winding apparatus
Assignee: Koppers Co Inc
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Filing: 1967-10-02
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Granted: 1971-01-12
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Expires: 1987-10-02
Abstract
Abstract A CIRCULAR, ANNULAR RESIN TROUGH IS MOVABLE AXIALLY OF A ROTATABLE MANDREL AND FILAMENT ROVINGS, PASSING THROUGH HOLES IN THE WALLS OF THE TROUGH, BECOME RESIN IMPREGNATED BEFORE BEING HELICALLY WOUND ONTO THE ROTATING MANDREL. BY OMITTING ALTERNATE ROVINGS, A TUBULAR CYLINDRICAL STRUCTURE HAVING A POROUS, BASKET-WEAVE TYPE SHELL MAY BE FORMED.
Inventors
- 👤 Jonas Medney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:31
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/583; B29C53/587; B29C53/60; B29C53/62; B29C53/66; B29C53/665; B29C53/80; B29C53/8008; B29C53/8066
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |