Patent US1587679A successfully refreshed from Google Patents.
US1587679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of recovering calcium carbonate from caustic liquors
Assignee: Brown Co
•
Filing: 1924-01-17
•
Granted: 1926-06-08
•
Expires: 1944-01-17
Abstract
No abstract record available.
Inventors
- 👤 George A Richter
- 👤 Sanford L Swasey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:27
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/18; D; D21; D21C; D21C11/00; D21C11/0064; Y; Y02; Y02P; Y02P40/00; Y02P40/40
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1929-06-07 | 1929-12-07 | 1930-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-06-07 | 1933-12-07 | 1934-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-06-07 | 1937-12-07 | 1938-06-08 | $7700.00 | Window Closed / Lapsed |