Patent US2917501A successfully refreshed from Google Patents.
US2917501A
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Polymerization of ethylene with a cyclopentadienyl titanium catalyst
Assignee: Wyeth Holdings LLC
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Filing: 1958-09-02
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Granted: 1959-12-15
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Expires: 1978-09-02
Abstract
No abstract record available.
Inventors
- 👤 Drucker Arnold
- 👤 Jr John H Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:14
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/02; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/6592
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE PROCESS OF PREPARING POLYETHYLENE WHICH COMPRISES SUBJECTING ETHYLENE TO POLYMERIZATION AT A TEMPERATURE OF FROM ABOUT -10* C. TO ABOUT 100* C. AND AT A PRESSURE OF FROM ABOUT ATMOSPHERIC PRESSURE TO ABOUT 50 ATMOSPHERES IN THE PRESENCE OF A CO-CATALYST SYSTEM CONSISTING ESSENTIALLY OF (A) A MONOCYCLOPENTADIENYL TITANIUM TRIHALIDE AND (B) AN ORGANOMETALLIC COMPOUND OF METALS OF GROUP I TO GROUP III OF THE PERIODIC. SYSTEM.
Claim 2
Dependent Claim
68 words
THE PROCESS OF PREPARING POLYETHYLENE WHICH COMPRISES SUBJECTING ETHYLENE TO POLYMERIZATION AT A TEMPERATURE OF FROM ABOUT -10* C. TO ABOUT 100* C. AND AT A PRESSURE OF FROM ABOUT ATMOSPHERIC PRESSURE TO ABOUT 50 ATMOSPHERES IN THE PRESENCE OF A CO-CATALYST SYSTEM CONSISTING ESSENTIALLY OF (A) A MONOCYCLOPENTADIENYL TITANIUM TRIHALIDE AND (B) AN ORGANOMETALLIC COMPOUND OF METALS OF GROUP I TO GROUP III OF THE PERIODIC. SYSTEM.
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) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |