Patent US3524811A successfully refreshed from Google Patents.
US3524811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flocculating process
Assignee: WR Grace and Co
•
Filing: 1968-04-08
•
Granted: 1970-08-18
•
Expires: 1988-04-08
Abstract
No abstract record available.
Inventors
- 👤 Andrew G Tsuk
- 👤 Thomas E Ferington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:14
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C02F1/5236
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2740522A
Cited
US2729557A
Cited
US2980610A
Cited
US3019195A
Cited
US3118832A
Cited
US3110666A
Cited
US3252899A
Cited
US3331773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |