Patent US3587981A successfully refreshed from Google Patents.
US3587981A
Expired / Lapsed
US
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Process for the size reduction of expanded plastics
Assignee: BASF SE
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Filing: 1968-09-13
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Granted: 1971-06-28
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Expires: 1988-09-13
Abstract
Abstract A PROCESS FOR THE SIZE REDUCTION OF EXPANDED PLASTICS, COMPRISING PRELIMINARY SIZE OREDUCTION OF EXPANDED PLASTICS BLOCKS BY SHEARING ACTION BETWEEN ROLLERS ARMED WITH SHEAR BLADES AND STATIONARY BLADES AND FURTHER SIZE REDUCTION BY CONTINUED SHEARING ACTION.
Inventors
- 👤 Leo Unterstenhoefer
- 👤 Wilhelm Krieger
- 👤 Limburgerhof Pfalz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:23
CPC Classifications
B; B02; B02C; B02C18/00; B02C18/06; B02C18/14; B02C18/148; B26; B26D; B26D1/00; B26D1/01; B26D1/12; B26D1/25; B26D1/34; B26D1/38; B02C2018/147; B02C18/16; B02C18/18; B02C2018/188
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |