US3733270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of scale inhibition
Assignee: Monsanto Co
•
Filing: 1971-03-08
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Granted: 1973-05-15
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Expires: 1991-03-08
Abstract
Abstract THE PRECIPITATION OF SCALE-FORING SALTS IN AN AQUEOUS SYSTEM IS INHIBITED BY ADDING EITHER STOICHIOMETRIC OR SUBSTOICHIOMETRIC AMOUNTS TO SAID SYSTEM OF AN ORGANOPHOSPHORUS COMPOUND WHICH IS A SUBSTITUTED ETHANE DIPHOSPHONIC ACID OR ITS SALT, SAID ORGANO-PHOSPHORUS COMPOUND HAVING THE FORMULA R3-O-P(=O)(-O-R3)-C(-R2)(-CHN-R1)-P(=O)(-O-R3)2 WHEREIN R1 AND R2 ARE HEREINAFTER DEFINED AND R3 IS HYDROGEN OR A METAL ION AND N IS AN INTEGER HAVING A VALUE OF 1 OR 2.
Inventors
- 👤 A Kerst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:43
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3839; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |