Patent US4670191A successfully refreshed from Google Patents.
US4670191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of N-phosphonomethylglycine
Assignee: Hoechst AG
•
Filing: 1986-09-09
•
Granted: 1987-06-02
•
Expires: 2006-09-09
Abstract
Abstract A process for the preparation of N-phosphonomethylglycine by reaction of aminomethanephosphonic acid and glyoxylic acid in the molar ratio 1:2 in aqueous medium.
Inventors
- 👤 Hans-Jerg Kleiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:58
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3813
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
41 words
A process for the preparation of N-phosphonomethylglycine of the formula ##STR5## wherein aminomethanephosphonic acid of the formula ##STR6## or salts thereof with strong bases, are reacted with glyoxylic acid in the molar ratio of about 1:2 in aqueous or aqueous-organic medium.
Claim 2
Dependent Claim
41 words
A process for the preparation of N-phosphonomethylglycine of the formula ##STR5## wherein aminomethanephosphonic acid of the formula ##STR6## or salts thereof with strong bases, are reacted with glyoxylic acid in the molar ratio of about 1:2 in aqueous or aqueous-organic medium.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1, wherein the reaction is carried out at temperatures of 10°-100° C.
Claim 4
Dependent Claim
14 words
The process as claimed in claim 1, wherein a water-miscible organic solvent is added.
Claim 5
Dependent Claim
15 words
The process as claimed in claim 2, wherein the temperatures are 30° to 100° C.
Claim 6
Dependent Claim
15 words
The process as claimed in claim 3, wherein the solvent is acetone, acetonitril or methanol.
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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |