US3677413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tertiary filtering arrangement
Assignee: ENVIRONMENTAL SCIENCES Inc
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Filing: 1970-12-28
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Granted: 1972-07-18
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Expires: 1990-12-28
Abstract
Abstract A method of preparing material for use in purifying water is disclosed. The material is advantageously processed from used, waste newsprint by grinding it until it will pass through a 70-80 mesh screen, cleaning the ground newsprint with solvent to remove residual oil, scorching the cleaned newsprint and then regrinding to a fineness that will pass through a 400-mesh screen. The material when added to water to be purified reduces the BOD content of the water being treated.
Inventors
- 👤 Salem Boorujy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:49
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; C; C02; C02F; C02F1/00; C02F1/28; C02F1/286
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
22 words
An additive for use in the clarification of liquids having particulate matter suspended therein comprising finely ground and scorched oil-free waste newsprint.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |