US3630937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonated polystyrene compositions and methods of treating boiler water
Assignee: Calgon Corp
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Filing: 1968-05-06
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Granted: 1971-12-28
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Expires: 1988-05-06
Abstract
Abstract COMPOSITIONS AND METHODS FOR BOILER WATER TREATMENT ARE DISCLOSED. THE COMPOSITIONS CONTAIN A SULFONATED POLYSTYRENE TO ACT AS A DISPERSIVE; IN ADDITION, THEY MAY CONTAIN A CHELATING AGENT SUCH AS NA3NTA. A USEFUL COMPOSITION COMBINES THE POLYMER WITH A SILICATE AND/OR A PHOSPHATE.
Inventors
- 👤 Raymond N Baum
- 👤 Edward N Rebis
- 👤 Phillip B Reilly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:17
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C02F5/125; 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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |