US3127370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making fiber-grade polyethylene
Assignee: —
•
Filing: 1958-05-28
•
Granted: 1964-03-31
•
Expires: 1978-05-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:16
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
IN A PROCESS WHEREIN ETHYLENE IS POLYMERIZED TO NORMALLY SOILID POLYMER IN SOLUTION IN AN INERT LIQUID SOLVENT SELECTED FROM THE GROUP CONSISTING OF PARAFFINS AND ALICYCLIC HYDROCARBON HAVING FROM 5 TO 12 CARBON ATOMS PER MOLECULE AT A TEMPERATURE IN THE RANGE 250 TO 400* F. IN THE PRESENCE OF A POLYMERIZATION CATALYST COMPRISING CHROMIUM OXIDE SUPPORTED ON AT LEAST ONE MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICA, ALUMINA, ZIRCONIA AND THORIA, AT LEAST PART OF THE CHROMIUM BEING HEXAVALENT, THE IMPROVEMENT WHICH COMPRISES VARYING THE POLYMERIZATION TEMPERATURE TO EFFECT AN AVERAGE RANGE OF TEMPERATURE VARIATION OF BETWEEN ABOUT 3 AND ABOUT 75 FAHRENHEIT DEGREES AND A MAXIMUM TEMPERATURE VARIATION OF AT LEAST 10 FAHRENHEIT DEGREES, AND COMMINGLING THE POLYETHYLENE POLYMERS FORMED AT THE DIFFERENT TEMPERATURES TO PRODUCE A POLYMER COMPOSITION WHICH CAN BE READILY SPUN TO FORM FIBERS, FROM ABOUT 5 TO 75 WEIGHT PERCENT OF SAID POLYMER BEING FORMED AT A TEMPERATURE IN THE RANGE OF 265 TO 285*F.
Claim 2
Dependent Claim
163 words
IN A PROCESS WHEREIN ETHYLENE IS POLYMERIZED TO NORMALLY SOILID POLYMER IN SOLUTION IN AN INERT LIQUID SOLVENT SELECTED FROM THE GROUP CONSISTING OF PARAFFINS AND ALICYCLIC HYDROCARBON HAVING FROM 5 TO 12 CARBON ATOMS PER MOLECULE AT A TEMPERATURE IN THE RANGE 250 TO 400* F. IN THE PRESENCE OF A POLYMERIZATION CATALYST COMPRISING CHROMIUM OXIDE SUPPORTED ON AT LEAST ONE MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICA, ALUMINA, ZIRCONIA AND THORIA, AT LEAST PART OF THE CHROMIUM BEING HEXAVALENT, THE IMPROVEMENT WHICH COMPRISES VARYING THE POLYMERIZATION TEMPERATURE TO EFFECT AN AVERAGE RANGE OF TEMPERATURE VARIATION OF BETWEEN ABOUT 3 AND ABOUT 75 FAHRENHEIT DEGREES AND A MAXIMUM TEMPERATURE VARIATION OF AT LEAST 10 FAHRENHEIT DEGREES, AND COMMINGLING THE POLYETHYLENE POLYMERS FORMED AT THE DIFFERENT TEMPERATURES TO PRODUCE A POLYMER COMPOSITION WHICH CAN BE READILY SPUN TO FORM FIBERS, FROM ABOUT 5 TO 75 WEIGHT PERCENT OF SAID POLYMER BEING FORMED AT A TEMPERATURE IN THE RANGE OF 265 TO 285*F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-31 | 1967-09-30 | 1968-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-31 | 1971-09-30 | 1972-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-31 | 1975-09-30 | 1976-03-31 | $7700.00 | Window Closed / Lapsed |