D21G 3/005
Doctor knifes
Official title: {Doctor knifes}
D21G3/005 (Doctor knifes) appears on 211 US grants and 163 published applications in this corpus.
Search patents in D21G- Granted patents
- 211
- Published applications
- 163
- Assignees
- 78
- Inventors
- 334
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 7 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 5 | 0 |
| 1998 | 4 | 0 |
| 1999 | 10 | 0 |
| 2000 | 5 | 0 |
| 2001 | 10 | 3 |
| 2002 | 12 | 15 |
| 2003 | 12 | 13 |
| 2004 | 12 | 11 |
| 2005 | 10 | 10 |
| 2006 | 4 | 11 |
| 2007 | 6 | 6 |
| 2008 | 1 | 8 |
| 2009 | 3 | 8 |
| 2010 | 8 | 4 |
| 2011 | 4 | 3 |
| 2012 | 5 | 5 |
| 2013 | 0 | 5 |
| 2014 | 2 | 7 |
| 2015 | 4 | 4 |
| 2016 | 3 | 2 |
| 2017 | 2 | 4 |
| 2018 | 3 | 10 |
| 2019 | 3 | 7 |
| 2020 | 7 | 4 |
| 2021 | 7 | 3 |
| 2022 | 4 | 7 |
| 2023 | 4 | 5 |
| 2024 | 7 | 6 |
| 2025 | 6 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Fibrous structures4 Aug 2026US 12,698,594 B2The Procter & Gamble Company
- Doctor blade including natural reinforcement fabric layers bonded together with bio-derived resin matrix11 Nov 2025US 12,467,203 B2Kadant Inc.
- Stud for a doctor blade holder in a fiber web machine and doctor blade assembly for a fiber web machine14 Oct 2025US 12,442,136 B2Valmet Technologies Oy
- Yankee drying cylinder and a tissue paper making machine23 Sep 2025US 12,421,662 B2Valmet Corporation
- Method and apparatus for anomaly detection on a doctor blade of a papermaking machine, and computing device29 Jul 2025US 12,371,857 B2Aktiebolaget Skf
- Fiber body production apparatus and fiber body production method12 Mar 2026US 2026/0071383 A1Seiko Epson Corporation
- Creping blade for tissue making30 Jan 2025US 2025/0033314 A1Irving Consumer Products Limited
- Blade and creping arrangement8 Aug 2024US 2024/0262071 A1Voith Patent GmbH
- Fibrous Structures11 Jul 2024US 2024/0229357 A1The Procter & Gamble Company
- Set for Maintenance of a Doctor Blade in a Fiber Web Machine and Doctor Arrangement in a Fiber Web Machine13 Jun 2024US 2024/0191432 A1Valmet Technologies Oy
Most cited
By later US patents
- Wet crepe, impingement-air dry process for making absorbent sheet110US 6,432,267 B1Georgia-Pacific Corporation · 2002
- Device for the reciprocating linear drive of a part76US 4,642,839 A1987
- Method of and apparatus for compensatingly adjusting doctor blade76US 4,919,756 AThe Procter & Gamble Company · 1990
- Support beam made of composite fiber material64US 5,356,519 AJ. M. Voith GmbH · 1994
- Biaxially undulatory tissue and creping process using undulatory blade56US 5,690,788 AJames River Corporation of Virginia · 1997