Patent US3619863A successfully refreshed from Google Patents.
US3619863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing tube portions of non-circular cross-section
Assignee: Individual
•
Filing: 1969-08-14
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Granted: 1971-11-16
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Expires: 1989-08-14
Abstract
Abstract A TUBE PORTION OF NON-CIRCULAR CROSS-SECTION, AND OF THERMOPLASTIC MATERIAL, IS PRODUCED BY SHAPING A PREFABRICATED TUBE PORTION OF CIRCULAR CROSS-SECTION. THE SHAPING TAKES PLACE UNDER THE ACTION OF HEAT, USING STRETCHING AND PASSING CO-OPERATING MOULD PARTS. DURING SHAPING THE SIDES OF THE TUBE PORTION ARE CURVED INWARDLY SO THAT THEY ARE CAUSED TO ASSUME PLANE FORM BY COOLING AND SHRINKING.
Inventors
- 👤 Dina Ciabani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:40
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/22; B29C55/24; B31; B31C; B31C11/00; B31C11/02; Y; Y10; Y10S; Y10S425/00; Y10S425/061
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |