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Patent US3833690A successfully refreshed from Google Patents.
US3833690A
Expired / Lapsed
US
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Ethane diphosphonic acid esters
Assignee: Monsanto Co
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Filing: 1972-08-23
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Granted: 1974-09-03
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Expires: 1992-08-23
Abstract
Abstract NEW AND USEFUL SUBSTITUTED ETHANE DIPHOSPHONIC ACIDS AND SALTS AND ESTERS THEREOF AS EXEMPLIFIED BY THE ESTER COMPOUND HAVING THE FORMULA CH3-CO-O-CH2-C(-OH)(-P(=O)(-OH)-O-C2H5)2 DIETHYL-2-ACETOXY-1-HYDROXY-ETHANE-1,1-DIPHOSPHONATE AND PROCESSES FOR PREPARING THE SAME WHICH GENERICALLY COMPRISE THE "DE-OXIRANIZATION" OF AN EPOXY ETHANE DIPHOSPHONATE HAVING THE FORMULA 2,2-DI(-P(=O)(-OR3)2)-OXIRANE WHEREIN R3 IS HYDROGEN, A METAL ION, OR AN ORGANIC RADICAL.
Inventors
- 👤 A Kerst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:08
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: 0
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References Cited (Backward Citations)
US2848475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |