US3366677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature preparation of ethane-1-hydroxy-1, 1-diphosphonic acid
Assignee: Procter and Gamble Co
•
Filing: 1965-05-13
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Granted: 1968-01-30
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Expires: 1985-05-13
Abstract
No abstract record available.
Inventors
- 👤 Oscar T Quimby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:52
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3839; C07F9/386; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS FOR PREPARING ETHANE-1-HYDROXY-1,1-DIPHOSPHONIC ACID WHICH COMPRISES THE STEPS OF (A) PREPARING A REACTION SOLUTION COMPRISING PHOSPHOROUS ACID, ACETIC ANHYDRIDE, AND ACETYL CHLORIDE IN WHICH THE MOLAR PROPORTIONS OF THESE REACTANTS ARE RESPECTIVELY IN THE RANGE OF FROM ABOUT 1:3:1 TO ABOUT 1:8:5, (B) HEATING SAID REACTION SOLUTION TO A TEMPERATURE IN THE RANGE OF FROM ABOUT 30*C. TO ABOUT 90*C. FOR A PERIOD OF TIME OF FROM ABOUT 5 MINUTES TO ABOUT 9 HOURS UNTIL AN ACETYLATED INTERMEDIATE CONDENSATE OF ETHANE -1-HYDROXY-1,1-DIPHOSPHONIC ACID IS FORMED WHICH PRECIPITATES OUT OF THE REACTION SOLUTION, (C) FILTERING SAID REACTIONS SOLUTION TO SEPARATE SAID ACYLATED INTERMEDIATE CONDENSATE AND TO OBTAIN A
Claim 2
Dependent Claim
109 words
A PROCESS FOR PREPARING ETHANE-1-HYDROXY-1,1-DIPHOSPHONIC ACID WHICH COMPRISES THE STEPS OF (A) PREPARING A REACTION SOLUTION COMPRISING PHOSPHOROUS ACID, ACETIC ANHYDRIDE, AND ACETYL CHLORIDE IN WHICH THE MOLAR PROPORTIONS OF THESE REACTANTS ARE RESPECTIVELY IN THE RANGE OF FROM ABOUT 1:3:1 TO ABOUT 1:8:5, (B) HEATING SAID REACTION SOLUTION TO A TEMPERATURE IN THE RANGE OF FROM ABOUT 30*C. TO ABOUT 90*C. FOR A PERIOD OF TIME OF FROM ABOUT 5 MINUTES TO ABOUT 9 HOURS UNTIL AN ACETYLATED INTERMEDIATE CONDENSATE OF ETHANE -1-HYDROXY-1,1-DIPHOSPHONIC ACID IS FORMED WHICH PRECIPITATES OUT OF THE REACTION SOLUTION, (C) FILTERING SAID REACTIONS SOLUTION TO SEPARATE SAID ACYLATED INTERMEDIATE CONDENSATE AND TO OBTAIN A
References Cited (Backward Citations)
US3214454A
Cited
DE1148551B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-29 | 1971-07-31 | 1972-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-29 | 1975-07-31 | 1976-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-29 | 1979-07-31 | 1980-01-30 | $7700.00 | Window Closed / Lapsed |