US4304674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of disposing of a washing water sludge from filtering systems
Assignee: Individual
•
Filing: 1979-12-04
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Granted: 1981-12-08
•
Expires: 1999-12-04
Abstract
Abstract A washing water sludge from filtering systems, obtained through settling thereof, is disposed of by being introduced into a concrete mix as the mixing water for the preparation of concrete.
Inventors
- 👤 Yakov B. Lazovsky
- 👤 Mark G. Novikov
- 👤 Andrei I. Kostrits
- 👤 Valery Y. Rotan
- 👤 Vladimir F. Sheryakov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:22
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/008; C04; C04B; C04B22/00; C04B22/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A method of disposing of a washing water sludge consisting essentially of iron salts, obtained through settling thereof in a water treatment filtering system, said method comprising the steps of adding the sludge to a concrete mix consisting essentially of cement and aggregate to provide a water-cement ratio of 0.35 to 0.70, and allowing the mix to harden into concrete.
Claim 2
Independent Claim
60 words
A method of disposing of a washing water sludge consisting essentially of iron salts, obtained through settling thereof in a water treatment filtering system, said method comprising the steps of adding the sludge to a concrete mix consisting essentially of cement and aggregate to provide a water-cement ratio of 0.35 to 0.70, and allowing the mix to harden into concrete.
References Cited (Backward Citations)
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JPS5033175A
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US3947283A
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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) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |