D21H 17/68
Siliceous
Official title: siliceous, e.g. clays
D21H17/68 (Siliceous) appears on 549 US grants and 445 published applications in this corpus.
Search patents in D21H- Granted patents
- 549
- Published applications
- 445
- Assignees
- 277
- Inventors
- 1,167
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 5 | 0 |
| 1980 | 4 | 0 |
| 1981 | 8 | 0 |
| 1982 | 3 | 0 |
| 1983 | 12 | 0 |
| 1984 | 4 | 0 |
| 1985 | 7 | 0 |
| 1986 | 6 | 0 |
| 1987 | 5 | 0 |
| 1988 | 12 | 0 |
| 1989 | 12 | 0 |
| 1990 | 23 | 0 |
| 1991 | 16 | 0 |
| 1992 | 14 | 0 |
| 1993 | 13 | 0 |
| 1994 | 8 | 0 |
| 1995 | 6 | 0 |
| 1996 | 15 | 0 |
| 1997 | 22 | 0 |
| 1998 | 16 | 0 |
| 1999 | 16 | 0 |
| 2000 | 18 | 0 |
| 2001 | 16 | 5 |
| 2002 | 20 | 9 |
| 2003 | 5 | 23 |
| 2004 | 14 | 17 |
| 2005 | 6 | 25 |
| 2006 | 0 | 22 |
| 2007 | 12 | 20 |
| 2008 | 8 | 14 |
| 2009 | 7 | 21 |
| 2010 | 8 | 17 |
| 2011 | 15 | 14 |
| 2012 | 15 | 18 |
| 2013 | 13 | 16 |
| 2014 | 15 | 17 |
| 2015 | 11 | 26 |
| 2016 | 5 | 11 |
| 2017 | 15 | 21 |
| 2018 | 14 | 17 |
| 2019 | 13 | 27 |
| 2020 | 20 | 21 |
| 2021 | 11 | 20 |
| 2022 | 18 | 24 |
| 2023 | 12 | 13 |
| 2024 | 12 | 15 |
| 2025 | 11 | 4 |
| 2026 | 1 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Polymer compositions and coatings22 Sep 2026US 12,742,090 B2The Penn State Research Foundation
- Oil/grease resistant paper products4 Nov 2025US 12,460,353 B2Sappi North America, Inc.
- Electromagnetic wave shield sheet manufacturing method and electromagnetic wave shield sheet30 Sep 2025US 12,428,544 B2Hokuetsu Corporation
- Microfibrillated cellulose containing pulp sheets with improved mechanical properties12 Aug 2025US 12,385,185 B2FiberLean Technologies Limited
- Fire retardant paper12 Aug 2025US 12,385,188 B2Thermal Ceramics, Inc.
- Ceiling basemat water reduction through strategic use of pressing and vacuuming17 Sep 2026US 2026/0275636 A1USG Interiors, Inc.
- Stretchable paper23 Jul 2026US 2026/0210057 A1Billerud Aktiebolag (publ)
- Structure for producing casting, method for producing same, and method for producing casting using same16 Jul 2026US 2026/0199964 A1Kao Corporation
- Oil/grease resistant paper products18 Jun 2026US 2026/0168175 A1Sappi North America, Inc.
- Packaging biomaterial and method for manufacturing thereof23 Apr 2026US 2026/0109823 A1Kyiv Institute of Biotechnologies
Most cited
By later US patents
- Production of paper and paperboard198US 4,753,710 AAllied Colloids Limited · 1988
- Papermaking and products made thereby159US 4,388,150 AEKA Aktiebolag · 1983
- Polysilicate microgels as retention/drainage aids in papermaking126US 4,954,220 AE. I. Du Pont de Nemours and Company · 1990
- Process for production of paper or board123US 9,605,382 B2Kemira Oyj · 2017
- Production of paper and paper board121US 4,913,775 AAllied Colloids Limited · 1990