US3631017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
After-treating polyethylene in a shearing unit
Assignee: BASF SE
•
Filing: 1970-01-27
•
Granted: 1971-12-28
•
Expires: 1990-01-27
Abstract
Abstract A METHOD OF AFTER-TREATING HIGH-PRESSURE POLYETHYLENE IN SHEARING UNIT, WHEREIN THE HIGH-PRESSURE POLYETHYLENE IS INTRODUCED INTO THE SHEARING UNIT AT 200* TO 300*C. AND A VISCOSITY OF 5X10**3 TO 1X10**5 POISES AND SUBJECTED TO A SHEARING GRADIENT, THE SHEARING SURFACES CONTACTING THE POLYETHYLENE MELT BEING HEATED A TEMPERATURE WHICH IS AT LEAST AS HIGH AS THAT OF THE POLYETHYLENE MELT AND THE POLYETHYLENE MELT BEING SHEARED AT SUCH A SHEARING SPEED THAT THE PRODUCT OF SHEARING SPEED AND RESIDENCE TIME IN THE SHEARING ZONE IS EQUAL TO 5X10**2 TO 5X10**4.
Inventors
- 👤 August Rettig
- 👤 Wolfgang Ball
- 👤 Johann Zizlsperger
- 👤 Friedrich Urban
- 👤 Helmut Pfannmueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:44
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/02; B29B13/022; B29C; B29C48/00; B29C48/25; B29C48/78; B29C48/793; B29C48/80; B29C48/83; B29C48/832; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |