US3969398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing N-phosphonomethyl glycine
Assignee: Monsanto Co
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Filing: 1974-05-01
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Granted: 1976-07-13
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Expires: 1994-05-01
Abstract
Abstract A process for the production of N-phosphonomethyl glycine by the oxidation of N-phosphonomethylimino diacetic acid utilizing a molecular oxygen-containing gas as the oxidant in the presence of a catalyst consisting essentially of activated carbon. The N-phosphonomethyl glycine produced is useful as a herbicide or plant growth regulant.
Inventors
- 👤 Arnold Hershman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:21
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3813
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
45 words
A process for the production of N-phosphonomethyl glycine which comprises contacting an aqueous solution on N-phosphonomethylimino diacetic acid with a molecular oxygen-containing gas at a temperature sufficiently elevated to initiate and sustain reaction and in the presence of a catalyst consisting essentially of activated carbon.
Claim 2
Dependent Claim
45 words
A process for the production of N-phosphonomethyl glycine which comprises contacting an aqueous solution on N-phosphonomethylimino diacetic acid with a molecular oxygen-containing gas at a temperature sufficiently elevated to initiate and sustain reaction and in the presence of a catalyst consisting essentially of activated carbon.
Claim 3
Dependent Claim
17 words
A process as claimed in claim 1 wherein the temperature is from 25°C. to 150°C. or higher.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 2 wherein the temperature is from 75°C. to 150°C.
Claim 5
Dependent Claim
25 words
A process as claimed in claim 1 wherein the pressure of the molecular oxygen-containing gas is from 0.5 Kg/cm 2 to 200 Kg/cm 2 .
Claim 6
Dependent Claim
20 words
A process as claimed in claim 4 wherein the pressure is from 1 Kg/cm 2 to 7 Kg/cm 2 .
Claim 7
Dependent Claim
24 words
A process as claimed in claim 1 wherein the activated carbon has a surface area of from 100 to 2000 square meters per gram.
Claim 8
Dependent Claim
25 words
A process as claimed in claim 6 wherein the activated carbon has a surface area of from 400 to about 1600 square meters per gram.
Claim 9
Dependent Claim
15 words
A process as claimed in claim 6 wherein the activated carbon is in powder form.
Claim 10
Dependent Claim
19 words
A process as claimed in claim 8 wherein said activated carbon has a particle size smaller than 325 mesh.
Claim 11
Dependent Claim
15 words
A process as claimed in claim 6 wherein said activated carbon is in granular form.
Claim 12
Dependent Claim
19 words
A process as claimed in claim 10 wherein said activated carbon has a particle size larger than 30 mesh.
Claim 13
Dependent Claim
20 words
A process as claimed in claim 11 wherein the particle size of the activated carbon is larger than 20 mesh.
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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |