D21G
Calenders
Official title: CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES (winders or rewinders for finished products, means for adjustment of wrinkles or lateral extensions B65H)
D21G (Calenders) appears on 2,288 US grants and 1,383 published applications in this corpus.
Search patents in D21G- Granted patents
- 2,288
- Published applications
- 1,383
- Assignees
- 568
- Inventors
- 3,030
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 18 | 0 |
| 1977 | 23 | 0 |
| 1978 | 22 | 0 |
| 1979 | 10 | 0 |
| 1980 | 22 | 0 |
| 1981 | 20 | 0 |
| 1982 | 21 | 0 |
| 1983 | 15 | 0 |
| 1984 | 23 | 0 |
| 1985 | 28 | 0 |
| 1986 | 21 | 0 |
| 1987 | 43 | 0 |
| 1988 | 31 | 0 |
| 1989 | 35 | 0 |
| 1990 | 52 | 0 |
| 1991 | 57 | 0 |
| 1992 | 59 | 0 |
| 1993 | 45 | 0 |
| 1994 | 38 | 0 |
| 1995 | 47 | 0 |
| 1996 | 50 | 0 |
| 1997 | 70 | 0 |
| 1998 | 91 | 0 |
| 1999 | 87 | 0 |
| 2000 | 79 | 0 |
| 2001 | 126 | 35 |
| 2002 | 121 | 95 |
| 2003 | 83 | 108 |
| 2004 | 97 | 106 |
| 2005 | 67 | 84 |
| 2006 | 66 | 77 |
| 2007 | 44 | 64 |
| 2008 | 42 | 59 |
| 2009 | 35 | 61 |
| 2010 | 51 | 57 |
| 2011 | 41 | 19 |
| 2012 | 44 | 32 |
| 2013 | 19 | 26 |
| 2014 | 28 | 38 |
| 2015 | 24 | 44 |
| 2016 | 35 | 47 |
| 2017 | 33 | 37 |
| 2018 | 35 | 48 |
| 2019 | 46 | 47 |
| 2020 | 34 | 37 |
| 2021 | 35 | 47 |
| 2022 | 34 | 44 |
| 2023 | 39 | 49 |
| 2024 | 43 | 51 |
| 2025 | 34 | 49 |
| 2026 | 25 | 22 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
Recent patents
- Smoking rolling paper and a method for packaging the same29 Sep 2026US 12,745,793 B2
- Adjusting rolls22 Sep 2026US 12,742,289 B2Voith Patent GmbH
- Method of controlling the drying of cellulose pulp in a drying step of a pulp production process15 Sep 2026US 12,735,841 B2Andritz Technology and Asset Management GmbH
- Method for distributing chemicals in delignification stages of pulp bleaching process1 Sep 2026US 12,723,350 B2Andritz Inc.
- Automated interframe alignment monitoring for sheet manufacturing applications25 Aug 2026US 12,716,823 B2Honeywell International Inc.
- Method for producing a base paper17 Sep 2026US 2026/0275643 A1Mondi AG
- Sheet manufacturing apparatus10 Sep 2026US 2026/0265998 A1Seiko Epson Corporation
- Hybrid gas/electric air heating system for material drying systems6 Aug 2026US 2026/0226682 A1Andritz Canada Inc.
- Method and apparatus for managing paper-making process using digital twin30 Jul 2026US 2026/0218452 A1Electronics and Telecommunications Research Institute
- Apparatus for the treatment of paper material23 Jul 2026US 2026/0210043 A1Toscotec S.P.A.
Most cited
By later US patents
- Method for improved rush transfer to produce high bulk without macrofolds122US 5,830,321 AKimberly-Clark Worldwide, Inc. · 1998
- Wet crepe, impingement-air dry process for making absorbent sheet110US 6,432,267 B1Georgia-Pacific Corporation · 2002
- Control system using process model108US 6,772,036 B2Fisher-Rosemount Systems, Inc. · 2004
- Method of controlling adhesive build-up on a yankee dryer103US 7,850,823 B2Georgia-Pacific Consumer Products LP · 2010
- Apparatus for calendering a sheet material web carried by a fabric89US 6,585,858 B1Kimberly-Clark Worldwide, Inc. · 2003