US3816518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ethane diphosphonic acids substituted with both amine and hydroxy groups
Assignee: Monsanto Co
•
Filing: 1972-03-13
•
Granted: 1974-06-11
•
Expires: 1992-03-13
Abstract
Abstract NEW AND USEFUL SUBSTITUTED ETHANE DIPHOSPHONIC ACIDS AND SALTS AND ESTERS THEREOF AS EXEMPLIFIED BY THE ESTER COMPOUND HAVING THE FORMULA HO-CH2-C(-P(=O)(-O-C2H5)2)2-OH TETRAETHYL, 1,2-DIHYDROXY ETHANE-1,1-DIPHOSPHONATE AND PROCESSES FOR PREPARING THE SAME WHICH GENERICALLY COMPRISES THE "DE-OXIRANIZATION" OF AN EPOXY ETHANE DIPHOSPHONATE HAVING THE FORMULA 2,2-BIS((R3-O-)2-P(=O)-)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
2026-10-27 09:08
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2784233A
Cited
US2653160A
Cited
US2662097A
Cited
US2917528A
Cited
US2953570A
Cited
GB934090A
Cited
US3453301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |