C08G 64/20
General preparatory processes
C08G64/20 (General preparatory processes) appears on 1,550 US grants and 1,339 published applications in this corpus.
Search patents in C08G- Granted patents
- 1,550
- Published applications
- 1,339
- Assignees
- 367
- Inventors
- 2,729
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 9 | 0 |
| 1978 | 10 | 0 |
| 1979 | 4 | 0 |
| 1980 | 8 | 0 |
| 1981 | 23 | 0 |
| 1982 | 20 | 0 |
| 1983 | 13 | 0 |
| 1984 | 9 | 0 |
| 1985 | 11 | 0 |
| 1986 | 4 | 0 |
| 1987 | 12 | 0 |
| 1988 | 26 | 0 |
| 1989 | 22 | 0 |
| 1990 | 21 | 0 |
| 1991 | 16 | 0 |
| 1992 | 19 | 0 |
| 1993 | 22 | 0 |
| 1994 | 43 | 0 |
| 1995 | 43 | 0 |
| 1996 | 32 | 0 |
| 1997 | 28 | 0 |
| 1998 | 29 | 0 |
| 1999 | 27 | 0 |
| 2000 | 22 | 0 |
| 2001 | 65 | 6 |
| 2002 | 42 | 38 |
| 2003 | 47 | 52 |
| 2004 | 47 | 35 |
| 2005 | 15 | 23 |
| 2006 | 27 | 27 |
| 2007 | 15 | 28 |
| 2008 | 13 | 25 |
| 2009 | 31 | 41 |
| 2010 | 32 | 31 |
| 2011 | 16 | 39 |
| 2012 | 25 | 53 |
| 2013 | 35 | 52 |
| 2014 | 35 | 73 |
| 2015 | 60 | 74 |
| 2016 | 79 | 77 |
| 2017 | 63 | 78 |
| 2018 | 61 | 71 |
| 2019 | 56 | 67 |
| 2020 | 66 | 75 |
| 2021 | 53 | 70 |
| 2022 | 43 | 71 |
| 2023 | 25 | 71 |
| 2024 | 36 | 63 |
| 2025 | 48 | 58 |
| 2026 | 30 | 41 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Polycarbonate, and method for preparing same6 Oct 2026US 12,753,277 B2LG Chem.Ltd.
- Polycarbonate and method for preparing same29 Sep 2026US 12,747,320 B2LG Chem.Ltd.
- Ring-opening polymerizations using a flow reactor8 Sep 2026US 12,729,271 B2International Business Machines Corporation
- Process for making transparent polymer-based materials for solar panels21 Jul 2026US 12,686,742 B2Saudi Arabian Oil Company
- Process for producing polycarbonate—point of addition of the chain terminator14 Jul 2026US 12,679,930 B2Covestro Intellectual Property GmbH & Co.KG
- Polycarbonate-based resin composition and molded article8 Oct 2026US 2026/0308318 A1Idemitsu Kosan Co., Ltd.
- Polycarbonate resin composition and molded article thereof8 Oct 2026US 2026/0308374 A1Idemitsu Kosan Co., Ltd.
- Surface-active agent1 Oct 2026US 2026/0297250 A1Econic Technologies Ltd.
- Composition and method for producing same, urethane resin, aqueous urethane resin dispersion, and coating agent24 Sep 2026US 2026/0286037 A1Tosoh Corporation
- Polycarbonate resin and optical member using said resin24 Sep 2026US 2026/0286048 A1Teijin Limited
Most cited
By later US patents
- Process for preparing branched aromatic polycarbonates247US 6,437,083 B1General Electric Company · 2002
- Hydrolytically degradable polymers and hydrogels made therefrom235US 6,348,558 B1Shearwater Corporation · 2002
- Polycarbonate transesterification process201US 4,217,438 AGeneral Electric Company · 1980
- Preparation of branched polycarbonate composition from cyclic aromatic polycarbonate oligomer, polyhydric phenol and polycarbonate107US 5,191,038 AGeneral Electric Company · 1993
- Polycarbonate preparation process90US 6,225,436 B1The Dow Chemical Company · 2001