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US3962318A
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Substituted ethane diphosphonic acids and salts and esters thereof
Assignee: Monsanto Co
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Filing: 1975-03-21
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Granted: 1976-06-08
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Expires: 1995-03-21
Abstract
Abstract New and useful substituted ethane diphosphonic acids and salts and esters thereof as exemplified by the ester compound having the formula ##EQU1## tetraethyl, 1,2 dihydroxy ethane-1,1-diphosphonate and processes for preparing the same which generically comprise the "de-oxiranization" of an epoxy ethane diphosphonate having the formula ##EQU2## wherein R 3 is hydrogen, a metal ion, or an organic radical.This is a division of application Ser. No. 463,224, filed Apr. 23, 1974. now U.S. Pat. No. 3,899,528, which was a division of Ser. No. 283,147, filed Aug. 23, 1972, now U.S. Pat. No. 3,833,690, which in turn was a division of Ser. No. 27,988, filed Apr. 13, 1970, now U.S. Pat. No. 3,705,191.
Inventors
- 👤 Al F. Kerst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:37
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3839; C07F9/547; C07F9/655; C07F9/65502; C07F9/65505; D; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/288
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
50 words
An ethane diphosphonate of the formula ##EQU15## wherein each R 3 is selected from the group consisting of hydrogen, alkali metal ions and ammonium ions, and R 1 and R 2 are either hydroxy or carboxy provided that either R 1 or R 2 but not both is always hydroxy.
Claim 2
Dependent Claim
50 words
An ethane diphosphonate of the formula ##EQU15## wherein each R 3 is selected from the group consisting of hydrogen, alkali metal ions and ammonium ions, and R 1 and R 2 are either hydroxy or carboxy provided that either R 1 or R 2 but not both is always hydroxy.
Claim 3
Dependent Claim
11 words
The diphosphonate compound of claim 1 wherein R 3 is hydrogen.
Claim 4
Dependent Claim
24 words
The diphosphonate compound of claim 1 wherein R 3 is an alkali metal ion selected from the group consisting of sodium, potassium and lithium.
Claim 5
Dependent Claim
11 words
The diphosphonate compound of claim 1 wherein R 3 is potassium.
Claim 6
Dependent Claim
16 words
The diphosphonate compound of claim 1 wherein R 1 is carboxy and R 2 is hydroxy.
Claim 7
Dependent Claim
16 words
The diphosphonate compound of claim 1 wherein R 1 is hydroxy and R 2 is carboxy.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |