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Patent US2685577A successfully refreshed from Google Patents.
US2685577A
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Ethylene polymerization process
Assignee: Standard Oil Co
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Filing: 1952-05-21
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Granted: 1954-08-03
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Expires: 1972-05-21
Abstract
No abstract record available.
Inventors
- 👤 William J Cerveny
- 👤 Donald E Burney
- 👤 Gert H Weisemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:07
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
62 words
A PROCESS OF POLYMERIZING ETHYLENE TO FORM NORMALLY SOLID POLYETHYLENE, THE SAID PROCESS COMPRISING ADMIXING ETHYLENE AND FROM 25 PERCENT TO 90 PERCENT, BASED ON THE TOTAL WEIGHT OF THE MIXTURE, OF AN AQUEOUS SOLUTION OF AN ALCOHOL SELECTECD FROM THE GROUP CONSISTING OF METHANOL AND TERTIARY BUTANOL TO FORM A PLURALITY OF SEPARATE PHASES, OF WHICH AN AQUEOUS PHASE CONTAINS FROM
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) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |