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Patent US2909579A successfully refreshed from Google Patents.
US2909579A
Expired / Lapsed
US
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Process for recovering low boiling point hydrocarbons, especially ethylene
Assignee: Carl Still GmbH and Co KG
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Filing: 1956-02-27
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Granted: 1959-10-20
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Expires: 1976-02-27
Abstract
No abstract record available.
Inventors
- 👤 Schmidt Josef
- 👤 Weber Heinrich
- 👤 Holt Herbord Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:29
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005; C07C7/11
Claims Analysis
Total Claims: 0
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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) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |