US3143539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of processable polyolefins
Assignee: Bridgestone Firestone Inc
•
Filing: 1960-02-04
•
Granted: 1964-08-04
•
Expires: 1980-02-04
Abstract
No abstract record available.
Inventors
- 👤 Farhat Kelly
- 👤 Frederick J Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:18
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/50; Y; Y10; Y10S; Y10S526/00; Y10S526/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
PROCESS FOR REDUCING THE MOLECULAR WEIGHT OF A HIGH MOLECULAR WEIGHT POLYMER OF ETHYLENE HAVING AN INTRINIC VISCOSITY ABOVE 1.5 AND HAVING BEEN PRODUCED BY CONTACT OF ETHYLENE WITH A CATALYST OBTAINED BY PARTIAL REDUCTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF OXIDES, HALIDES, OXYHALIDES AND ALCOHOLATES OF TITANIUM, VANADIUM, NICKEL, COBALT, IRON AND CHROMIUM BY MEANS OF A REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF THE FREE METALS OF GROUPS I, II AND III OF THE PERIODIC TABLE AND THE ORGANOMETALLIC COMPOUNDS OF SUCH METALS, WHICH COMPRISES WASHING SAID POLYMER WITH AN AQUEOUS SOLUTION OF A POLYOXOLEFIN HAVING THE STRUCTURE
Claim 2
Dependent Claim
104 words
PROCESS FOR REDUCING THE MOLECULAR WEIGHT OF A HIGH MOLECULAR WEIGHT POLYMER OF ETHYLENE HAVING AN INTRINIC VISCOSITY ABOVE 1.5 AND HAVING BEEN PRODUCED BY CONTACT OF ETHYLENE WITH A CATALYST OBTAINED BY PARTIAL REDUCTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF OXIDES, HALIDES, OXYHALIDES AND ALCOHOLATES OF TITANIUM, VANADIUM, NICKEL, COBALT, IRON AND CHROMIUM BY MEANS OF A REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF THE FREE METALS OF GROUPS I, II AND III OF THE PERIODIC TABLE AND THE ORGANOMETALLIC COMPOUNDS OF SUCH METALS, WHICH COMPRISES WASHING SAID POLYMER WITH AN AQUEOUS SOLUTION OF A POLYOXOLEFIN HAVING THE STRUCTURE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |