Patent US3557290A successfully refreshed from Google Patents.
US3557290A
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Method for ram forming monolithic plastic articles
Assignee: WS Dickey Clay Manufacturing Co
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Filing: 1968-04-15
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Granted: 1971-01-19
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Expires: 1988-04-15
Abstract
Abstract A METHOD FOR RAM FORMING MONOLITHIC PLASTIC ARTICLES, WHICH PRODUCES ARTICLES, SUCH AS CLAY PIPE AND FITTINGS, WITHOUT STESS LINES AND WITHOUT KNIT OR BOND LINES. THE METHOD USES A MOLD HAVING AN ELONGATE CAVITY HAVING AN INSIDE SURFACE CONFIGURATION CORRESPONDING TO AN OUTSIDE SURFACE OF THE ARTICLE TO BE FORMED THEREIN. BORE FORMING MANDRELS OR RAMS AREMOVABLE INTO THE ELONGATE CAVITY FOR FORCING A COMPRESSION FROMED MASS OF PLASTIC CLAY TO FLOW AROUND THE MANDRELS AND FILL THE CAVITY AND FOR THE ARTICLE WITH BORES THEREIN. THE MANDRELS BEING REMOVABLE FROM THE CAVITY AND THE MOLD OPENED FOR REMOVAL OF THE ARTICLE.
Inventors
- 👤 Edward C Siegfreid
- 👤 Conner J Harwell
- 👤 Sheilds L Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:27
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/70; B28B21/74
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |