Patent US3577341A successfully refreshed from Google Patents.
US3577341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water treatment
Assignee: Pennwalt Corp
•
Filing: 1968-10-18
•
Granted: 1971-05-04
•
Expires: 1988-10-18
Abstract
Abstract IN WATER TREATMENT, IMMEDIATELY FOLLOWING TREATING WITH CHEMICALS AND SETTLING OF SEDIMENTED MATERIAL, THE LATTER NO LONGER NEED BY RETURNED AS A POLLUTANT TO A WATER COURSE, OR OTHERWISE DISPOSED OF. RATHER, THE SEDIMENTED MATERIAL IS CENTRIFUGALLY CONCENTRATED FOR CONVENIENT DISPOSAL IN COMPACT FORM AND THE WATER SEPARATED THEREFROM MAY BE REPROCESSED.
Inventors
- 👤 Frederick W Keith Jr
- 👤 Everett M Jones
- 👤 Joseph R Townsend Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:52
CPC Classifications
C; C02; C02F; C02F9/00; B; B01; B01D; B01D21/00; B01D21/0006; B01D21/0012; B01D21/01; B01D21/02; B01D21/26; B01D36/00; B01D36/04; C02F1/00; C02F1/38; C02F1/385; C02F1/52; B01D21/262
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |