Patents
US 11634442 B2: Methods for the purification of L-glufosinate
- Granted
- 2023-04-25
- Filed
- 2018-07-17 application 16631963
- Type
- Utility · 4 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
Compositions and methods for isolating L-glufosinate from a composition comprising L-glufosinate and glutamate are provided. The method comprises converting the glutamate to pyroglutamate followed by the isolation of L-glufosinate from the pyroglutamate and other components of the composition to obtain substantially purified L-glufosinate. The composition comprising L-glufosinate and glutamate is subjected to an elevated temperature for a sufficient time to allow for the conversion of glutamate to pyroglutamate, followed by the isolation of L-glufosinate from the pyroglutamate and other components of the composition to obtain substantially purified L-glufosinate. The glutamate alternatively may be converted to pyroglutamate by enzymatic conversion. The purified L-glufosinate is present in a final composition at a concentration of 90% or greater of the sum of L-glufosinate, glutamate, and pyroglutamate. In some embodiments, a portion of the glutamate in the starting composition may be separated from the L-glufosinate using a crystallization step. Solid forms of L-glufosinate materials, including crystalline L-glufosinate ammonium, are also described.
Source: PVGPATDIS, file of 2026-04-10 (ipg230425.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| BASF SE 6,481 patents | Foreign company or organization | Ludwigshafen, DE | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Stephen Craig Fields | Baltimore, MD | 5 | PVGPATDIS, file of 2026-04-10 | |
| Matthew Richard Oberholzer | Wilmington, DE | 14 | PVGPATDIS, file of 2026-04-10 | |
| Brian Michael Green | Timonium, MD | 20 | PVGPATDIS, file of 2026-04-10 | |
| Samir Kulkarni | East Lyme, CT | 7 | PVGPATDIS, file of 2026-04-10 | |
| Jennifer Nelson | Kokomo, IN | 20 | PVGPATDIS, file of 2026-04-10 | |
| Patricia Andres | West Lafayette, IN | 50 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| B01D | Separation | B01D15/361 | PVGPATDIS, file of 2026-04-10 |
| C07F | Acyclic, carbocyclic or heterocyclic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur, selenium or tellurium | C07F9/535 | PVGPATDIS, file of 2026-04-10 |
| A01N | Preservation of bodies of humans or animals or plants or parts thereof ; biocides, e.g. as disinfectants, as pesticides or as herbicides ; pest repellants or attractants; plant growth regulators | A01N57/20 | PVGPATDIS, file of 2026-04-10 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2020-11-18 | Assignment Assignment of assignor's interest | AGRIMETIS, LLC signed 2020-09-01 | BASF SE LUDWIGSHAFEN AM RHEIN | 54405/808 | PASDL, file of 2026-10-15 |
| 2020-05-14 | Assignment Assignment of assignor's interest | KULKARNI, SAMIR signed 2018-07-19 NELSON, JENNIFER signed 2018-07-16 ANDRES, PATRICIA signed 2018-07-16 | ALBANY MOLECULAR RESEARCH, INC. ALBANY, NY | 52665/656 | PASDL, file of 2026-10-15 |
| 2020-05-14 | Assignment Assignment of assignor's interest | ALBANY MOLECULAR RESEARCH, INC. signed 2018-08-01 | AGRIMETIS, LLC LUTHERVILLE, MD | 52664/375 | PASDL, file of 2026-10-15 |
| 2020-05-14 | Assignment Assignment of assignor's interest | FIELDS, STEPHEN CRAIG signed 2018-07-20 OBERHOLZER, MATTHEW RICHARD signed 2018-07-20 GREEN, BRIAN MICHAEL signed 2018-07-20 | AGRIMETIS, LLC LUTHERVILLE, MD | 52664/37 | PASDL, file of 2026-10-15 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.