Patent US2820779A successfully refreshed from Google Patents.
US2820779A
Expired / Lapsed
US
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Ethylene polymerization
Assignee: Standard Oil Co
•
Filing: 1953-11-27
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Granted: 1958-01-21
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Expires: 1973-11-27
Abstract
No abstract record available.
Inventors
- 👤 Clark H Dale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:08
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S159/00; Y10S159/10; Y10S260/00; Y10S260/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A PROCESS WHICH COMPRISES PASSING ETHYLENE INTO CONTACT WITH A CATALYST HAVING THE FORMULA
Claim 2
Dependent Claim
14 words
A PROCESS WHICH COMPRISES PASSING ETHYLENE INTO CONTACT WITH A CATALYST HAVING THE FORMULA
References Cited (Backward Citations)
US2405962A
Cited
US2728753A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |