US2455643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation products from ketones and aralkyl organic compounds and method for producing the same
Assignee: Shell Development Co
•
Filing: 1944-03-25
•
Granted: 1948-12-07
•
Expires: 1964-03-25
Abstract
No abstract record available.
Inventors
- 👤 Arthur B Bakalar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:29
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/2637; C07C22/00; C07C22/02; C07C22/04; C07C25/00; C07C25/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1593080A
Cited
US1961397A
Cited
US1970972A
Cited
US2143509A
Cited
US2211070A
Cited
US2254904A
Cited
US2329074A
Cited
US2384866A
Cited
US2391104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-07 | 1952-06-07 | 1952-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-07 | 1956-06-07 | 1956-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-07 | 1960-06-07 | 1960-12-07 | $7700.00 | Window Closed / Lapsed |