US3350302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clarification of surface waters
Assignee: Nikex Nehezipari Kulkereskedelmi Vallalat
•
Filing: 1964-09-16
•
Granted: 1967-10-31
•
Expires: 1984-09-16
Abstract
No abstract record available.
Inventors
- 👤 Demeter Laszlo
- 👤 Galgoczi Bela
- 👤 Bozzay Emma
- 👤 Zagyvai Istvan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:27
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR CLARIFICATION OF SURFACE WATERS, WHICH COMPRISES ADMIXING TO THE WATER IN A CLARIFICATION SYSTEM A POLYELECTROLYTE AND A HARD, NON-POROUS SAND HAVING A PARTICLE SIZE OF 10-200 MICRONS AND A SPECIFIC SURFACE OF 100-500 CM.2/G., SETTLING AND THEN SEPARATING THE SETTLED SOLIDS FROM THE WATER, AND REGENERATING THE SAND FOR RECIRCULATION WITHOUT SIGNIFICANT LOSS THEREOF TO THE CLARIFICATION SYSTEM.
Claim 2
Dependent Claim
62 words
A PROCESS FOR CLARIFICATION OF SURFACE WATERS, WHICH COMPRISES ADMIXING TO THE WATER IN A CLARIFICATION SYSTEM A POLYELECTROLYTE AND A HARD, NON-POROUS SAND HAVING A PARTICLE SIZE OF 10-200 MICRONS AND A SPECIFIC SURFACE OF 100-500 CM.2/G., SETTLING AND THEN SEPARATING THE SETTLED SOLIDS FROM THE WATER, AND REGENERATING THE SAND FOR RECIRCULATION WITHOUT SIGNIFICANT LOSS THEREOF TO THE CLARIFICATION SYSTEM.
References Cited (Backward Citations)
US3168419A
Cited
US3142638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-30 | 1971-05-01 | 1971-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-30 | 1975-05-01 | 1975-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-30 | 1979-05-01 | 1979-10-31 | $7700.00 | Window Closed / Lapsed |