C22B 3/387
Cyclic or polycyclic compounds
Official title: {Cyclic or polycyclic compounds}
C22B3/387 (Cyclic or polycyclic compounds) appears on 23 US grants and 0 published applications in this corpus.
Search patents in C22B- Granted patents
- 23
- Published applications
- 0
- Assignees
- 14
- Inventors
- 36
- Latest grant
- 6 Nov 2001
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for separating actinides and lanthanides by liquid-liquid extraction using calixarenes6 Nov 2001US 6,312,653 B1Commissariat A L' Energie Atomique
- Separation of rare earth values by liquid/liquid extraction9 Mar 1993US 5,192,443 ARhone-Poulenc Chimie
- Separation of rare earth values by liquid/liquid extraction23 Feb 1993US 5,188,735 ARhone-Poulence Chimie
- Recovery of transition metals from aqueous solutions14 Nov 1989US 4,880,546 AShell Oil Company
- Selective removal of metals from aqueous solutions with dithiophosphinic acids26 Jan 1988US 4,721,605 AAmerican Cyanamid Company
No published applications in this class yet.
Most cited
By later US patents
- Method for separating metal constituents from ocean floor nodules46US 4,042,664 ADeepsea Ventures, Inc. · 1977
- Separation of rare earth values by liquid/liquid extraction28US 5,192,443 ARhone-Poulenc Chimie · 1993
- Separation of rare earth values by liquid/liquid extraction24US 4,647,438 ARhone-Poulenc Specialties Chimiques · 1987
- Method for separating actinides and lanthanides by liquid-liquid extraction using calixarenes21US 6,312,653 B1Commissariat A L' Energie Atomique · 2001
- Selective removal of metals from aqueous solutions with dithiophosphinic acids19US 4,721,605 AAmerican Cyanamid Company · 1988