Patent US1570830A successfully refreshed from Google Patents.
Patent US3309350A successfully refreshed from Google Patents.
US3309350A
Expired / Lapsed
US
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Process for polymerizing ethylene
Assignee: Dart Industries Inc
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Filing: 1963-07-31
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Granted: 1967-03-14
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Expires: 1983-07-31
Abstract
No abstract record available.
Inventors
- 👤 Joseph M Kelley
- 👤 Jr John J Miskel
- 👤 Paul J Marinaccio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:04
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; Y; Y10; Y10S; Y10S526/00; Y10S526/903; Y10S526/905; Y10T; Y10T82/00; Y10T82/14; Y10T82/141
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A HIGH CATALYST EFFICIENCY PROCESS FOR PREPARING AN ETHYLENE POLYMER HAVING A DENSITY OF AT LEAST 0.955 WHICH COMPRISES REACTING ETHYLENE IN A POLYMERIZATION REACTOR AT PRESSURES OF AT LEAST 800 P.S.I.G. AND TEMPERATURES OF FROM 50* TO 100*C. IN THE PRESENCE OF AN INERT HYDROCARBON DILUENT BOILING BELOW 10*C., IN LIQUID FORM AND HYDROGEN IN AMOUNTS OF FROM 10 TO 80% BASED ON THE ETHYLENE FEED EMPLOYING AS THE CATALYST FOR THE POLYMER-
Claim 2
Dependent Claim
74 words
A HIGH CATALYST EFFICIENCY PROCESS FOR PREPARING AN ETHYLENE POLYMER HAVING A DENSITY OF AT LEAST 0.955 WHICH COMPRISES REACTING ETHYLENE IN A POLYMERIZATION REACTOR AT PRESSURES OF AT LEAST 800 P.S.I.G. AND TEMPERATURES OF FROM 50* TO 100*C. IN THE PRESENCE OF AN INERT HYDROCARBON DILUENT BOILING BELOW 10*C., IN LIQUID FORM AND HYDROGEN IN AMOUNTS OF FROM 10 TO 80% BASED ON THE ETHYLENE FEED EMPLOYING AS THE CATALYST FOR THE POLYMER-
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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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |