US2728752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tertiary-butyl ethylene in ethylene polymerization
Assignee: Standard Oil Co
•
Filing: 1952-11-18
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Granted: 1955-12-27
•
Expires: 1972-11-18
Abstract
No abstract record available.
Inventors
- 👤 Herbert C Browa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:51
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A PROCESS COMPRISING POLYMERIZING ETHYLENE AT A TEMPERATURE BETWEEN 40* AND 175* C., AT AN ELEVATED PRESSURE, AND IN THE PRESENCE OF A FREE-FADICAL-INITIATOR CATALYST AND OF TERTIARY BUTYL ETHYLENE AS A POLYMERIZATION MODIFIER.
Claim 2
Dependent Claim
34 words
A PROCESS COMPRISING POLYMERIZING ETHYLENE AT A TEMPERATURE BETWEEN 40* AND 175* C., AT AN ELEVATED PRESSURE, AND IN THE PRESENCE OF A FREE-FADICAL-INITIATOR CATALYST AND OF TERTIARY BUTYL ETHYLENE AS A POLYMERIZATION MODIFIER.
References Cited (Backward Citations)
US2327705A
Cited
US2691647A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |