US2439307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery and purification of cyclopentadiene
Assignee: Phillips Petroleum Co
•
Filing: 1945-10-18
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Granted: 1948-04-06
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Expires: 1965-10-18
Abstract
No abstract record available.
Inventors
- 👤 Harold R Legatski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:01
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005; C07C4/00; C07C4/22; C07C7/148; C07C7/177; C07C2601/00; C07C2601/06; C07C2601/10; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2362227A
Cited
US2211038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-06 | 1951-10-06 | 1952-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-06 | 1955-10-06 | 1956-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-06 | 1959-10-06 | 1960-04-06 | $7700.00 | Window Closed / Lapsed |