Patent US3562879A successfully refreshed from Google Patents.
US3562879A
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Apparatus for the production of double-walled pipes of ceramic material
Assignee: Individual
•
Filing: 1966-02-23
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Granted: 1971-02-16
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Expires: 1986-02-23
Abstract
Abstract AN EXTRUSION PRESS FOR PRODUCING DOUBLE-WALLED PIPES OF CERAMIC MATERIAL COMPRISING AN ANNULAR CYLINDER, AN ANNULAR PISTON WITHIN THE CYLINDER, AND AN EXTRUSTION NOZZLE WITHIN THE ANNULAR CYLINDER COMPRISING A PLURALITY OF CORES SUSPENDED ON RADIAL SUSPENDED ON RADIAL SUSPENDING MEANS. D R A W I N G
Inventors
- 👤 Gottfried Cremer
- 👤 Heinz Behrens
- 👤 Hans Joachim Dietzsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:16
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/10; B; B28; B28B; B28B21/00; B28B21/52; B28B21/54; B28B3/00; B28B3/20; B28B3/24; B28B3/26; B28B3/269; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/11; B29C48/25; B29C48/30; B29C48/32; F16L9/08; B29L; B29L2031/00; B29L2031/60
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |