US3589998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for inhibiting scale formation on the surface of memberanes in reverse osmosis apparatuses
Assignee: Milchem Inc
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Filing: 1970-05-08
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Granted: 1971-06-29
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Expires: 1990-05-08
Abstract
Abstract THIS INVENTION RELATES TO A PROCESS FOR INHIBITING SCALE FORMATION ON THE SURFACE OF MEMBRANES IN REVERSE OSMOSIS APPARATUSES. THE PROCESS UTILIZES AS AN ADDITIVE TO THE WATER PRIOR TO ITS PASSAGE THROUGH THE APPARATUS AN ACRYLIC COMPOSITION FORMED FROM ABOUT 80 TO 90 PARTS BY WEIGHT ACRYLIC ACID, ABOUT 7 TO 15 PARTS BY WEIGHT THIOGLYCOLIC ACID AND ABOUT 1.5 TO 5 PARTS BY WEIGHT AMMONIUM PERSULFATE.
Inventors
- 👤 Herbert L Rice
- 👤 Fort Worth
- 👤 Arthur Cizek
- 👤 Marvin O Thaemar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:37
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |