Patent US3491935A successfully refreshed from Google Patents.
US3671348A
Expired / Lapsed
US
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Production of tubular articles
Assignee: TROISDORFER BAU- und KUNSTSTOFF GmbH
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Filing: 1970-03-23
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Granted: 1972-06-20
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Expires: 1990-03-23
Abstract
Abstract THE PRESENT INVENTION INVENTION RELATES TO IMPROVEMENTS IN THE PRODUCTION OF TUBULAR ARTICLES PRODUCED BY FORMING A STRIP OF A PLASTICS MATERIAL HAVING AN INSERT EMBEDDED THEREIN, HELICALLY WINDING THE STRIP ONTO A MANDREL SO THAT ADJACENT EDGE PORTIONS OVERLAP, BONDING OR WELDING THE OVERLAPPING EDGE PORTIONS, THE IMPROVEMENT BEING THAT REINFORCING RIBS, INTEGRAL WITH AND ANGLED AWAY FROM THE CONTINUOUS CONTAINER WALL ARE FORMED BY USING AS THE INSERT, A LENGTH OF PROFILING STRIP AND FORCING A PORTION OF THE PLASTICS MATERIAL OF THE STRIP INTO CONFORMITY WITH A PORTION OF THE EMBEDDED PROFILING INSERT.
Inventors
- 👤 Kenneth Kemsey-Bourne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:34
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/60
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |