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US2953607A
Expired / Lapsed
US
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Process for the preparation of tertiary alkyl cyclopentadienes
Assignee: Studiengesellschaft Kohle gGmbH
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Filing: 1959-05-12
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Granted: 1960-09-20
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Expires: 1979-05-12
Abstract
No abstract record available.
Inventors
- 👤 Hafner Klaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:37
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/32; C07C1/325; C07C1/328; C07C2601/00; C07C2601/06; C07C2601/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
28 words
A METHOD OF PRODUCING TERTIARY ALKYL CYCLOPENTADIENES WHICH COMPRISES REACTING AN ALKALI METAL COMPOUND OF CYCLOPENTADIENE WITH A TERTIARY ALKYL HALIDE AND SEPARATING THE RESULTING TERTIARY ALKYL CYCLOPENTADIENE.
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) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |