B41M 5/15
Spiro-pyrans
B41M5/15 (Spiro-pyrans) appears on 15 US grants and 1 published applications in this corpus.
Search patents in B41M- Granted patents
- 15
- Published applications
- 1
- Assignees
- 7
- Inventors
- 17
- Latest grant
- 26 Aug 2014
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 5 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 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 | 1 | 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 | 1 |
| 2014 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Mechanochromic coating composition26 Aug 2014US 8,815,771 B2PPG Industries Ohio, Inc.
- Monophase solid solutions comprising a plurality of color former compounds and process for their preparation20 May 2003US 6,566,302 B1Ciba Specialty Chemicals Corporation
- Recording material13 Oct 1992US 5,155,087 AMitsubishi Paper Mills Limited
- Spirodibenzopyrans9 Sep 1986US 4,611,070 ABASF SE
- Record material1 Apr 1986US 4,580,153 AKanzaki Paper Manufacturing Co., Ltd.
Most cited
By later US patents
- Spirodipyrans and chromogenic materials for copying processes32US 3,971,808 ABASF SE · 1976
- 7,7'-Diamino derivatives of 2,2'-spirodibenzopyranes6US 4,110,348 ABASF SE · 1978
- Mechanochromic coating composition6US 8,815,771 B2PPG Industries Ohio, Inc. · 2014
- Record material5US 4,580,153 AKanzaki Paper Manufacturing Co., Ltd. · 1986
- Spirodipyrans4US 4,161,589 ABASF SE · 1979