US3055827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of suspended solids
Assignee: Dow Chemical Co
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Filing: 1958-06-16
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Granted: 1962-09-25
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Expires: 1978-06-16
Abstract
No abstract record available.
Inventors
- 👤 Ralph M Wiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:14
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
111 words
A METHOD FOR FACILITATING THE SEPARATION OF FINELY DIVIDED SOLIDS FROM AQUEOUS SUSPENSION WHICH COMPRISES ADMIXING WITH SAID SUSPENSION A COMBINATION OF A WATERSOLUBLE POLY(VINYLBENZYL QUATERNARY AMMONIUM COMPOUND) SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF VINYLBENZYL TRIALKLAMMONIUM SALTS AND COPOLYMERS OF A VINYLBENZYL TRIALKYLAMMONIUM SALT WITH A MEMBER OF THE GROUP CONSISTING OF ACRYLAMIDE AND METHACRYLAMIDE WHEREIN SAID ALKYL GROUPS CONTAIN FROM 1 TO 4 CARBON ATOMS AND A WATER-SOLUBLE HIGH MOLECULAR WEIGHT ACRYLIC POLYMER SAID POLY(VINYLBENZYL QUATERNARY AMMONIUM COMPOUND) AND ACRYLIC POLYMER BEING ADDED TO THE SUSPENSION SUCCESSIVELY IN PREDETERMINED ORDER WITH INTERVENING THROUGH MIXING AND SAID COMBINATION BEING EMPLOYED IN AN AMOUNT SUFFICIENT TO AGGLOMERATE THE SUSPENDED SOLIDS.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |