C08L 23/22
Copolymers of isobutene
Official title: Copolymers of isobutene; Butyl rubber; Homopolymers or copolymers of other iso-olefins
C08L23/22 (Copolymers of isobutene) appears on 821 US grants and 788 published applications in this corpus.
Search patents in C08L- Granted patents
- 821
- Published applications
- 788
- Assignees
- 378
- Inventors
- 1,989
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 13 | 0 |
| 1978 | 8 | 0 |
| 1979 | 8 | 0 |
| 1980 | 7 | 0 |
| 1981 | 7 | 0 |
| 1982 | 8 | 0 |
| 1983 | 8 | 0 |
| 1984 | 8 | 0 |
| 1985 | 5 | 0 |
| 1986 | 12 | 0 |
| 1987 | 11 | 0 |
| 1988 | 6 | 0 |
| 1989 | 8 | 0 |
| 1990 | 13 | 0 |
| 1991 | 17 | 0 |
| 1992 | 13 | 0 |
| 1993 | 11 | 0 |
| 1994 | 15 | 0 |
| 1995 | 11 | 0 |
| 1996 | 14 | 0 |
| 1997 | 13 | 0 |
| 1998 | 12 | 0 |
| 1999 | 17 | 0 |
| 2000 | 19 | 0 |
| 2001 | 25 | 2 |
| 2002 | 17 | 25 |
| 2003 | 15 | 31 |
| 2004 | 22 | 40 |
| 2005 | 19 | 29 |
| 2006 | 15 | 31 |
| 2007 | 16 | 26 |
| 2008 | 13 | 31 |
| 2009 | 19 | 28 |
| 2010 | 17 | 47 |
| 2011 | 18 | 34 |
| 2012 | 23 | 34 |
| 2013 | 19 | 30 |
| 2014 | 29 | 36 |
| 2015 | 22 | 39 |
| 2016 | 15 | 31 |
| 2017 | 34 | 27 |
| 2018 | 26 | 44 |
| 2019 | 16 | 24 |
| 2020 | 29 | 50 |
| 2021 | 30 | 47 |
| 2022 | 26 | 36 |
| 2023 | 21 | 18 |
| 2024 | 23 | 20 |
| 2025 | 25 | 14 |
| 2026 | 11 | 14 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Encapsulation film22 Sep 2026US 12,742,064 B2LG Chem.Ltd.
- Sealant composition for self-sealing pneumatic tire15 Sep 2026US 12,734,772 B2The Goodyear Tire & Rubber Company
- Thermoplastic resin composition for refrigerant transportation hose and refrigerant transportation hose28 Jul 2026US 12,692,391 B2The Yokohama Rubber Co., Ltd.
- Compositions containing thermally conductive fillers14 Jul 2026US 12,680,011 B2PPG Industries Ohio, Inc.
- Aqueous dispersion of polyisobutylene and polyolefin particles9 Jun 2026US 12,649,850 B2Dow Global Technologies LLC
- Quinolineimine antidegradant compounds and uses thereof24 Sep 2026US 2026/0285812 A1Flexsys IP Holdings, LLC
- Butene (co)polymer-based sealing material for container closures17 Sep 2026US 2026/0275095 A1ACTEGA GmbH
- Elastomer Blends Comprising Brominated Isobutylene-P-Methylstyrene Copolymers and Tires or Tire Components Containing Same23 Jul 2026US 2026/0209499 A1
- A filler composition23 Jul 2026US 2026/0209588 A1
- Rubber compositions and articles thereof9 Jul 2026US 2026/0193457 A1The Goodyear Tire & Rubber Company
Most cited
By later US patents
- Para-alkylstyrene/isoolefin copolymers and functionalized copolymers thereof188US 5,162,445 AExxon Chemical Patents Inc. · 1992
- Chewable tobacco based product167US 4,624,269 AThe Pinkerton Tobacco Company · 1986
- Films of polypropylene blends and polyethylene blends and articles made therewith135US 5,071,686 A1991
- Thermoplastic elastomer composition, blends of the composition with olefin plastic, and foamed products of the composition and the blends126US 4,212,787 AMitsui Petrochemical Industries, Ltd. · 1980
- Rubber toughened thermoplastic resin nano composites124US 6,060,549 AExxon Chemical Patents Inc. · 2000