Patent US3028406A successfully refreshed from Google Patents.
US3028406A
Expired / Lapsed
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Preparation of organo-transition element compounds
Assignee: Union Carbide Corp
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Filing: 1955-07-25
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Granted: 1962-04-03
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Expires: 1975-07-25
Abstract
No abstract record available.
Inventors
- 👤 John C Brantley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:22
CPC Classifications
C; C07; C07F; C07F17/00; C07F17/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
20 words
A PROCESS FOR THE PREPARATION OF BIS(CYCLOPENTADIENYL(IRON WHICH COMPRISES REACTING CYCLOPENTADIENYL CALCIUM HAVING THE FORMULA (C5H5)2CA WITH AN IRON CHLORIDE.
References Cited (Backward Citations)
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US2680756A
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US2680758A
Cited
US2818416A
Cited
US2834796A
Cited
FR1097071A
Cited
US2777887A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |