Patent US3940436A successfully refreshed from Google Patents.
US3940436A
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Substituted ethane diphosphonic acids and salts and esters thereof
Assignee: Monsanto Co
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Filing: 1972-08-23
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Granted: 1976-02-24
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Expires: 1992-08-23
Abstract
Abstract New and useful substituted ethane diphosphonic acids and salts thereof as exemplified by the compound having the formula ##EQU1## 2-amino-1-hydroxyethane-1,1-diphosphonic acid 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.
Inventors
- 👤 Al F. Kerst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:29
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: 9
Claim 1
Independent Claim
71 words
An ethane diphosphonate of the formula ##EQU15## wherein each R 3 is individually selected from the group consisting of hydrogen, alkali metal ions, alkaline earth metal ions, ammonium ions and lower alkyl amine ions, and R 1 and R 2 are either hydroxy or -N(R 4 ) 2 groups wherein R 4 is either hydrogen or alkyl, provided that R 1 or R 2 , but not both, is always hydroxy.
Claim 2
Dependent Claim
71 words
An ethane diphosphonate of the formula ##EQU15## wherein each R 3 is individually selected from the group consisting of hydrogen, alkali metal ions, alkaline earth metal ions, ammonium ions and lower alkyl amine ions, and R 1 and R 2 are either hydroxy or -N(R 4 ) 2 groups wherein R 4 is either hydrogen or alkyl, provided that R 1 or R 2 , but not both, is always hydroxy.
Claim 3
Dependent Claim
5 words
2-amino-1-hydroxy ethane - 1,1-diphosphonic acid.
Claim 4
Dependent Claim
5 words
2-amino-1-hydroxy ethane - 1,1-diphosphonic acid.
Claim 5
Dependent Claim
10 words
A compound of claim 1 wherein R 2 is hydroxy.
Claim 6
Dependent Claim
9 words
A compound of claim 1 which is 2-hydroxy-1-aminoethane-1,1-diphosphonic acid.
Claim 7
Dependent Claim
9 words
A compound of claim 1 which is tetrasodium 2-amino-1-hydroxyethane-1,1-diphosphonate.
Claim 8
Dependent Claim
9 words
A compound of claim 1 which is 2-methylamino-1-hydroxyethane-1,1-diphosphonic acid.
Claim 9
Dependent Claim
9 words
A compound of claim 1 which is 2-diethylamino-1-hydroxyethane-1,1-diphosphonic acid.
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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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |