Patent US2911401A successfully refreshed from Google Patents.
US2911401A
Expired / Lapsed
US
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Di-alpha-naphthylzinc-titanium tetrachloride polymerization initiator and process
Assignee: Spencer Chemical Co
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Filing: 1956-02-20
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Granted: 1959-11-03
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Expires: 1976-02-20
Abstract
No abstract record available.
Inventors
- 👤 Willard C Bull
- 👤 Joe H Cain
- 👤 Roland J Spomer
- 👤 Jr Herman L Finkbeiner
- 👤 Robert W Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:25
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
70 words
THE PROCESS WHICH COMPRISES CONTACTING A 1-OLEFIN OF LESS THAN 4 CARBONS WITH A POLYMERIZATION INTIATOR CONSISTING ESSENTIALLY OF THE REACTION PRODUCT OF A RATIO OF ABOUT ONE MOLE OF DI-ALPHA-NAPHTHYLIZINC WITH 0.25 TO 4 MOLES OF TITANIUM TETRACHLORIDE IN THE PRESENCE OF AN INERT LIQUID MEDIUM AT A TEMPERATURE FROM 0*C, TO 300* C., AND A PRESSURE FROM ATMOSPHERIC TO 2000 ATMOSPHERES TO PRODUCE A POLYMER OF THE OLEFIN.
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) | 1962-11-02 | 1963-05-04 | 1963-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-02 | 1967-05-04 | 1967-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-02 | 1971-05-04 | 1971-11-03 | $7700.00 | Window Closed / Lapsed |