US3128249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for clarifying water
Assignee: Dow Chemical Co
•
Filing: 1955-07-18
•
Granted: 1964-04-07
•
Expires: 1975-07-18
Abstract
No abstract record available.
Inventors
- 👤 David J Pye
- 👤 George F Schurz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:24
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; C02F1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A METHOD FOR FACILITATING THE REDUCTION OF TURBIDITY IN WATER WHICH COMPRISES THE STEPS OF DISPERSING IN THE WATER A SLURRY OF BENTONITE IN THE AMOUNT OF FROM ABOUT 10 TO 500 PARTS BY WEIGHT OF BENTONITE PER MILLION PARTS BY WEIGHT OF WATER AND ADDING TO THE RESULTING DISPERSION AN ACRYLAMIDE POLYMER IN THE AMOUNT OF FROM ABOUT 0.05 TO 2 PARTS BY WEIGHT PER MILLION PARTS BY WEIGHT OF WATER.
Claim 2
Independent Claim
72 words
A METHOD FOR FACILITATING THE REDUCTION OF TURBIDITY IN WATER WHICH COMPRISES THE STEPS OF DISPERSING IN THE WATER A SLURRY OF BENTONITE IN THE AMOUNT OF FROM ABOUT 10 TO 500 PARTS BY WEIGHT OF BENTONITE PER MILLION PARTS BY WEIGHT OF WATER AND ADDING TO THE RESULTING DISPERSION AN ACRYLAMIDE POLYMER IN THE AMOUNT OF FROM ABOUT 0.05 TO 2 PARTS BY WEIGHT PER MILLION PARTS BY WEIGHT OF WATER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |