US3567768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing amino alkylenephosphonic acids
Assignee: Monsanto Co
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Filing: 1967-10-02
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Granted: 1971-03-02
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Expires: 1987-10-02
Abstract
Abstract PROCESSES FOR PREPARING AMINO ALKYLENEPHOSPHONIC ACIDS BY REACTING A NITROGENOUS MATERIAL SUCH AS AMMONIA, AN ORGANIC CARBONYL COMPOUND SUCH AS FORMALDEHYDE AND ORTHOPHOSPHOROUS ACID IN ORDER TO FORM SUCH AMINO ALKYLENE PHOSPHONIC ACID, SAID REACTION BEING CARRIED OUT IN THE PRESENCE OF A HALIDE CATALYST AND THE ORTHOPHOSPHOROUS ACID IS UTILIZED 20% IN EXCESS OF THE STOICHIOMETRIC AMOUNT REQUIRED TO REACT WITH THE AMMONIA AND FORMALDEHYDE.
Inventors
- 👤 Chung Yu Shen
- 👤 Steven J Fitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:02
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |