US2817674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of dicyclopentadienyliron from cyclopentadiene and pyrophoric ferrous oxide
Assignee: EIDP Inc
•
Filing: 1952-11-08
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Granted: 1957-12-24
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Expires: 1972-11-08
Abstract
No abstract record available.
Inventors
- 👤 Peter J Graham
- 👤 Gerald M Whitman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:50
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/30; C10L1/305; C07; C07F; C07F17/00; C07F17/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A PROCESS FOR THE PREPARATION OF DICYCLOPENTADIENYLIRON WHICH COMPRISES BRINGING CYCLOPENTADIENE IN CONTACT AT 300-450*C. WITH PYROPHORIC FERROUS OXIDE.
Claim 2
Dependent Claim
19 words
A PROCESS FOR THE PREPARATION OF DICYCLOPENTADIENYLIRON WHICH COMPRISES BRINGING CYCLOPENTADIENE IN CONTACT AT 300-450*C. WITH PYROPHORIC FERROUS OXIDE.
References Cited (Backward Citations)
GB171976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |