Description
Class C07D : HETEROCYCLIC COMPOUNDS
Subclass 201/16: Preparation, separation, purification, or stabilisation of unsubstituted lactams Separation or purification
C07D 201/16
Sub-Class
Stats
- 36 US PATENTS IN FORCE
- 5 US APPLICATIONS PENDING
- 23 Total Patent Owners
- 241 TOTAL INVENTORS
Recent Patents
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 11459302 | Refining process and refining system of caprolactam | Mar 22, 21 | Oct 04, 22 | ZHEJIANG HENGYI PETROCHEMICAL RESEARCH INSTITUTE CO., LTD. |
| 11208380 | Process for the purification of caprolactam from a solution of crude caprolactam without organic solvent extraction | Aug 21, 20 | Dec 28, 21 | AquafilSLO d.o.o. |
| 10906875 | Quaternary heteroatom containing compounds | May 31, 19 | Feb 02, 21 | California Institute of Technology |
| 10787417 | Process for the purification of caprolactam from a solution of crude caprolactam without organic solvent extraction | Dec 15, 17 | Sep 29, 20 | AquafilSLO d.o.o. |
| 10093622 | Efficient process for the synthesis of cyclic amides | Jun 04, 15 | Oct 09, 18 | ANTHEA AROMATICS PRIVATE LIMITED |
| 10005742 | Method for producing epoxy compound containing hydrogen peroxide stabilizer | Aug 11, 15 | Jun 26, 18 | Nissan Chemical Industries Ltd. |
| 9923194 | Process for purifying N-alkylpyrrolidones | Feb 08, 16 | Mar 20, 18 | BASF SE |
| 9908785 | Process and apparatus for producing ammonium sulfate crystals | Jun 20, 14 | Mar 06, 18 | CAP III B.V. |
| 9562008 | Process for the recovery of ε-caprolactam from extract water | Jul 07, 14 | Feb 07, 17 | TECHNIP ZIMMER GMBH |
| 9168311 | Oligomer-dantrolene conjugates and related compounds | Aug 20, 13 | Oct 27, 15 | NEKTAR THERAPEUTICS |
| 9096516 | Production method of N-vinyl-2-pyrrolidone | May 17, 11 | Aug 04, 15 | NIPPON SHOKUBAI CO., LTD. |
| 8846903 | Acyl-urea derivatives and uses thereof | Jun 25, 08 | Sep 30, 14 | YISSUM RESEARCH DEVELOPMENT COMPANY OF THE HEBREW UNIVERSITY OF JERUSALEM |
| 8841445 | Process for preparing purified caprolactam from the Beckmann rearrangement of cyclohexane oxime | Dec 18, 13 | Sep 23, 14 | BASF SE |
| 8604188 | Washing of an organic phase comprising caprolactam | Sep 02, 09 | Dec 10, 13 | CAP III B.V. |
| 8536213 | Oligomer-dantrolene conjugates and related compounds | Nov 14, 08 | Sep 17, 13 | NEKTAR THERAPEUTICS, NEKTAR THERAPEUTICS AL, CORPORATION, |
| 8399658 | Method for isolation of laurolactam from a laurolactam synthesis process stream | Nov 22, 10 | Mar 19, 13 | EVONIK DEGUSSA GMBH |
| 8309540 | HCV NS3 protease inhibitors | Oct 22, 07 | Nov 13, 12 | MERCK SHARP & DOHME CORP. |
| 8268990 | Compounds | Nov 20, 08 | Sep 18, 12 | DAINIPPON SUMITOMO PHARMA CO., LTD. |
| 8231765 | Process for the purification of lactams | May 29, 08 | Jul 31, 12 | RHODIA POLYAMIDE INTERMEDIATES |
| 8193348 | System and method for recovering caprolactam from rearrangement mixtures | May 29, 09 | Jun 05, 12 | China Petrochemical Development Corporation |
Recent Publications
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2025/0100,965 | SEPARATION OF IMPURITIES IN A PROCESS FOR HYDROLYTICALLY DEPOLYMERIZING A POLYAMIDE | Mar 30, 23 | Mar 27, 25 | Not available |
| 2024/0132,446 | COMPOSITIONS AND METHODS FOR REMOVAL OF N-METHYL-2-PYRROLIDONE (NMP) DEGRADATION PRODUCTS AND OTHER FOULANTS FROM NMP PURIFICATION SYSTEMS | May 24, 22 | Apr 25, 24 | Not available |
| 2024/0076,450 | PURIFICATION METHOD FOR LAUROLACTAM | Jan 20, 22 | Mar 07, 24 | Not available |
| 2021/0040,036 | PROCESS FOR THE PURIFICATION OF CAPROLACTAM FROM A SOLUTION OF CRUDE CAPROLACTAM WITHOUT ORGANIC SOLVENT EXTRACTION | Aug 21, 20 | Feb 11, 21 | Not available |
| 2019/0382,339 | Process for the purification of caprolactam from a solution of crude caprolactam without organic solvent extraction | Dec 15, 17 | Dec 19, 19 | Not available |
Top Owners in This Subclass
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Patents Issued To Date - By Filing Year
Average Time to Issuance
- 30 Months (last 2 years Issuances)
- 30 Months (last 5 years Issuances)