D21H 5/202
Polyolefins
Official title: {polyolefins}
D21H5/202 (Polyolefins) appears on 35 US grants and 2 published applications in this corpus.
Search patents in D21H- Granted patents
- 35
- Published applications
- 2
- Assignees
- 19
- Inventors
- 65
- Latest grant
- 8 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 2 | 0 |
| 1978 | 6 | 0 |
| 1979 | 6 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 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 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Sustainably-sourced, high strength non woven8 Jul 2025US 12,351,987 B2Fybervek Holdings LLC
- Novel polyethylene synthetic pulp8 Nov 1988US 4,783,507 AMitsui Petrochemical Industries, Ltd.
- Absorbent web structure7 Apr 1987US 4,655,877 AMitsui Petrochemical Industries, Ltd.
- Method of minimizing untoward effect of contaminants, such as pitch, in the papermaking operation26 Aug 1986US 4,608,123 AHercules Incorporated
- Process for the preparation of fibers from polymeric materials15 Jul 1986US 4,600,545 AMontecatini Edison S.p.A.
Most cited
By later US patents
- Non-woven fabric of hot-melt adhesive composite fibers57US 4,477,516 AChisso Corporation · 1984
- Process for making synthetic paper pulp38US 4,210,487 ASun Oil Company of Pennsylvania · 1980
- Absorbent material33US 4,458,042 AHercules Incorporated · 1984
- Absorbent web structure32US 4,655,877 AMitsui Petrochemical Industries, Ltd. · 1987
- Fibrils and processes for the manufacture thereof25US 4,013,751 AGulf Research & Development Company · 1977