Patent US3313021A successfully refreshed from Google Patents.
US3752761A
Expired / Lapsed
US
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Boiler water treatment
Assignee: Calgon Corp
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Filing: 1972-03-09
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Granted: 1973-08-14
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Expires: 1992-03-09
Abstract
Abstract IT IS DISCLOSED THAT POLYMERS CONTAINING AT LEAST 1 PERCENT BY WEIGHT OF (3-ACRYLAMIDO-3-METHYL) BUTYL TRIMETHYL AMMONIUM CHLORIDE AND/OR RELATED MONOMERS PERFORM AS EXCELLENT BOILER WATER DISPERSIVES AND CONDITIONERS. THE POLYMER SHOULD HAVE AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 10,000.
Inventors
- 👤 J Walker
- 👤 T Cornelius
- 👤 J Boothe
- 👤 A Sharpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:57
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |