US2657220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation derivatives of difurfuralacetone
Assignee: Individual
•
Filing: 1951-06-22
•
Granted: 1953-10-27
•
Expires: 1971-06-22
Abstract
No abstract record available.
Inventors
- 👤 Alexander Kliem
- 👤 Lester E Schniepp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:42
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/022; C10M2207/04; C10M2207/044; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
8 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF
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) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |