US3709816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of alluvial and other deposits in aqueous systems
Assignee: Calgon Corp
•
Filing: 1971-07-01
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Granted: 1973-01-09
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Expires: 1991-07-01
Abstract
Abstract POLYMERS OF 2-ACRYLAMIDO METHYL PROPYL SULFONATES OR SULFONIC ACID ARE USED TO FLUIDIZE AND DISPERSE INSOLUBLE ALLUVIAL DEPOSITS, SUCH AS SLIT, FROM WATER SYSTEMS.
Inventors
- 👤 J Walker
- 👤 J Boothe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:22
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |