Patent US3138172A successfully refreshed from Google Patents.
Patent US2355703A successfully refreshed from Google Patents.
US2355703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ketones
Assignee: Union Oil Company of California
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Filing: 1941-05-06
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Granted: 1944-08-15
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Expires: 1961-05-06
Abstract
No abstract record available.
Inventors
- 👤 Alva C Byrns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:05
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/40; C07C45/45; C07C45/455; C07C49/00; C07C49/20; C07C49/203; C07C49/527; C07C49/543
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-08-15 | 1948-02-14 | 1948-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-08-15 | 1952-02-14 | 1952-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-08-15 | 1956-02-14 | 1956-08-15 | $7700.00 | Window Closed / Lapsed |