Patent US2976304A successfully refreshed from Google Patents.
US2976304A
Expired / Lapsed
US
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Process for the preparation of cyclopentadienyl manganese compounds
Assignee: Ethyl Corp
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Filing: 1958-01-27
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Granted: 1961-03-21
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Expires: 1978-01-27
Abstract
No abstract record available.
Inventors
- 👤 Witt Earl G De
- 👤 Jerome E Brown
- 👤 Shapiro Hymin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:17
CPC Classifications
C; C07; C07F; C07F17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A PROCESS FOR THE PREPARATION OF A HYDROCARBON CYCLOMATIC MANGANESE COMPOUND HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
15 words
A PROCESS FOR THE PREPARATION OF A HYDROCARBON CYCLOMATIC MANGANESE COMPOUND HAVING THE GENERAL FORMULA
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) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |