US3709815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler water treatment
Assignee: Calgon Corp
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Filing: 1971-07-01
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Granted: 1973-01-09
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Expires: 1991-07-01
Abstract
Abstract IT IS DISCLOSED THAT POLYMERS CONTAINING AT LEAST 12 MOLE PERCENT OF 2 - ACRYLAMIDO 2 - SUBSTITUTED PROPANE1-SULFONIC ACID PERFORM AS EXCELLENT BOILER WATER DISPERSIVES AND CONDITIONERS. CERTAIN ALKYL AND OTHER SUBSTITUTES MAY BE INSERTED IN THE BETA POSITION OF THE UNSATURATED GROUP AND IN THE 2 POSITION OF THE PROPANE GROUP. THE MONOMER SHOULD BE PRESENT IN THE POLYMER CHAIN IN AMOUNTS AT LEAST ABOUT 12 MOLE PERCENT, AND THE POLYMER SHOULD HAVE AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 20,000.
Inventors
- 👤 J Boothe
- 👤 T Cornelius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:34
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 |