US3580855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for inhibition of scale and corrosion using a polyfunctional phosphated polyol ester having at least 75% primary phosphate ester groups
Assignee: Rohm and Haas Co
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Filing: 1969-04-09
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Granted: 1971-05-25
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Expires: 1989-04-09
Abstract
Abstract THE INVENTION IS CONCERNED WITH METHODS FOR MAINTAINING AN EFFECTIVE CORROSION-INHIBITING ENVIRONMENT IN AQUEOUS SYSTEMS, FOR PREVENTING PRECIPITATION OF FE(II) FROM SUCH SYSTEMS, AND FOR DISPERSING WATER-INSOLUBLE SOLIDS IN AQUEOUS SUSPENSION, SAID METHODS INVOLVING THE TREATMENT OF THE WATER SYSTEMS WITH SMALL AMOUNTS OF A SPECIFIC POLYFUNCTIONAL PHOSPHATED POLYOL ESTER CHARACTERIZED IN THAT THE ESTER HAS AT LEAST ABOUT 75% PRIMARY PHOSPHATE ESTER GROUPS.
Inventors
- 👤 James C Mickus
- 👤 David B Fordyce
- 👤 Richard C Mansfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:05
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1673
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |