US3600371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of polyethylene from solution
Assignee: Phillips Petroleum Co
•
Filing: 1968-11-12
•
Granted: 1971-08-17
•
Expires: 1988-11-12
Abstract
Abstract IN THE RECOVERY OF A NORMALLY SOLID POLYMER FROM A SOLUTION THEREOF BY FLASHING INTO A LOW-PRESSURE CHAMBER CONTAINING A CHOPPER WHEREIN THE SOLVENT VAPORIZES AND THE PRECIPITATED POLYMER IS CHOPPED INTO SMALL PARTICLES, THERE IS PROVIDED THE IMPROVEMENT OF CONTROLLING TEMPERATURE IN THE CHAMBER BY INJECTION OF LIQUID SOLVENT IN RESPONSE TO CHAMBER TEMPERATURE.
Inventors
- 👤 Stanley J Marwil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:43
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S159/00; Y10S159/10
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |