C07F 9/308
Pyrophosphinic acids
Official title: {Pyrophosphinic acids; Phosphinic acid anhydrides}
C07F9/308 (Pyrophosphinic acids) appears on 4 US grants and 1 published applications in this corpus.
Search patents in C07F- Granted patents
- 4
- Published applications
- 1
- Assignees
- 3
- Inventors
- 9
- Latest grant
- 20 Oct 2015
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 2 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Process for the preparation of bis(perfluoroalkyl)phosphinic acid anhydrides20 Oct 2015US 9,163,039 B2Merck Patent GmbH
- Methods for recovering bis(2,4,4-trimethylpentyl) dithiophosphinic acid13 Oct 2015US 9,156,866 B1Vale S.A.
- Process for the manufacture of phosphinic and phosphonic acid anhydrides12 May 1981US 4,267,125 AHoechst Aktiengesellschaft
- Alkane-bisalkyl-phosphinic anhydrides and process for the manufacture of alkane-phosphonic anhydrides and alkane-bis alkyl-phosphinic anhydrides25 Mar 1980US 4,195,035 AHoechst Aktiengesellschaft
Most cited
By later US patents
- Process for the manufacture of phosphinic and phosphonic acid anhydrides11US 4,267,125 AHoechst Aktiengesellschaft · 1981
- Alkane-bisalkyl-phosphinic anhydrides and process for the manufacture of alkane-phosphonic anhydrides and alkane-bis alkyl-phosphinic anhydrides8US 4,195,035 AHoechst Aktiengesellschaft · 1980