US3755509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphorus acid esters
Assignee: Rhone Poulenc Surfactants and Specialties LP
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Filing: 1970-06-01
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Granted: 1973-08-28
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Expires: 1990-06-01
Abstract
Abstract A PROCESS OF NEUTRALIZING PHOSPHATE ESTERS IS DESCRIBED. THE ESTERS ARE PREPARED BY REACTING A PHOSPHATING AGENT WITH A HYDROXYLIC ORGANIC COMPOUND. A LOWER ALKYLENE OXIDE IS ADDED TO THE ESTER AND CONTROLLED TEMPERATURES AND UNDER ANHYDROUS CONDITIONS TO ACHIEVE THE DESIRED DEGREE OF NEUTRALIZATION. THE NEUTRALIZED ESTERS HAVE SURFACE ACTIVE QUALITIES.
Inventors
- 👤 L Nunn
- 👤 L Schenck
- 👤 R Leary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:11
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/091
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |