US3770815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-soluble phosphonic acid composition
Assignee: BP America Production Co
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Filing: 1969-04-14
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Granted: 1973-11-06
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Expires: 1989-04-14
Abstract
Abstract A SOLUTION OF AMINO TRI(LOWER ALKYL PHOSPHONIC ACID) IN ORGANIC SOLVENTS IS PREPARED BY REACTION AN AQUEOUS SOLUTION OF THE PHOSPHONIC ACID WITH AN OIL-SOLUBLE AMINE HAVING A HYDROCARBON RADICAL CONTAINING A LEAST ABOUT TEN CARBON ATOMS, AND DISSOLVING THE REACTION PRODUCT IN A MIXTURE OF A SUBSTANTIALLY WATER-INSOLU BLE SOLVENT, SUCH AS OCTANOL, AND A WATER-SOLUBLE SOLVENT, SUCH AS METHANOL. SOLUBILITY OF THE AMINE PHOSPHONATE IS INCREASED BY USE OF AN AMINE SALT OF A CARBOXYLIC ACID. THE RESULTING SOLUTION IS USEFUL AS A SCALE INHIBITOR, CORROSION INHIBITOR, PARAFFIN SOLVENT AND INHIBITOR, AND ACID RETARDER IN OIL WELLS. IT HAS OTHER USES OUTSIDE THE OIL FIELD.
Inventors
- 👤 L Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:58
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3817; Y; Y10; Y10S; Y10S507/00; Y10S507/927; Y10S507/929; Y10S507/931
Claims Analysis
Total Claims: 0
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |