US2487610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of refining glycerin
Assignee: Nopco Chemical Co
•
Filing: 1947-08-15
•
Granted: 1949-11-08
•
Expires: 1967-08-15
Abstract
No abstract record available.
Inventors
- 👤 Francis J Sprules
- 👤 Liebling Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:42
CPC Classifications
C; C11; C11C; C11C3/00; C11C3/04; C11D; C11D19/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US544366A
Cited
US1824507A
Cited
US2389173A
Cited
US2383601A
Cited
US2383581A
Cited
US2392569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-07 | 1953-05-09 | 1953-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-07 | 1957-05-09 | 1957-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-07 | 1961-05-09 | 1961-11-08 | $7700.00 | Window Closed / Lapsed |