C14C 3/28
Multi-step processes
C14C3/28 (Multi-step processes) appears on 85 US grants and 66 published applications in this corpus.
Search patents in C14C- Granted patents
- 85
- Published applications
- 66
- Assignees
- 57
- Inventors
- 269
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 6 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 3 |
| 2005 | 0 | 1 |
| 2006 | 3 | 5 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 2 | 2 |
| 2011 | 0 | 2 |
| 2012 | 0 | 2 |
| 2013 | 1 | 6 |
| 2014 | 5 | 5 |
| 2015 | 1 | 2 |
| 2016 | 3 | 4 |
| 2017 | 2 | 3 |
| 2018 | 2 | 1 |
| 2019 | 3 | 4 |
| 2020 | 4 | 4 |
| 2021 | 2 | 2 |
| 2022 | 3 | 7 |
| 2023 | 2 | 4 |
| 2024 | 5 | 5 |
| 2025 | 2 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Methods for tanning animal skins with dialdehydes17 Mar 2026US 12,577,628 B2Db Patents Ltd.
- Use of reactive cross-linking agents for protein-containing substrates and processes for tanning and dyeing of leather3 Jun 2025US 12,319,974 B2Archroma (Switzerland) GmbH
- Process for tanning leathers, pre-tanning products and use thereof18 Mar 2025US 12,252,752 B2Silvateam S.P.A.
- Method of manufacturing leather10 Dec 2024US 12,163,197 B2Midori Auto Leather Co., Ltd.
- Chrome-free tanning process of ecological leather29 Oct 2024US 12,129,524 B2Sichuan University
- Grafted polymer of mono-unsaturated polycarboxylic acid as dyeing auxiliary or as re-tanning agent for leather9 Apr 2026US 2026/0098312 A1Stahl International B.V.
- Leather or retanning compound with cyclodextrin based inclusion compound10 Apr 2025US 2025/0115970 A1BI-QEM PTE Ltd
- Method for dyeing of leather31 Oct 2024US 2024/0360524 A1ECCO Sko A/S
- Chrome-free tanning process of ecological leather8 Aug 2024US 2024/0263257 A1Sichuan University
- Modified polylactones useful for fatliquoring6 Jun 2024US 2024/0182636 A1TFL Ledertechnik GmbH
Most cited
By later US patents
- Graft copolymers of unsaturated monomers and polyhydroxy compounds, a process for their production and their use38US 5,760,154 AStockhausen GmbH & Co. KG · 1998
- Method for treating a substrate made of animal fibers with solid particles and a chemical formulation comprising a colourant19US 9,845,516 B2Xeros Limited · 2017
- Leather treatment selected amphiphilic copolymers16US 5,316,860 ARohm and Haas Company · 1994
- Tanning agent formulation for manufacture of semifinished leather products14US 5,011,499 ASchill & Seilacher GmbH & Co. · 1991
- Method of treating leather with amphoteric polymers14US 5,709,714 ARohm and Haas Company · 1998