A63B 37/0044
Hardness gradient
Official title: {Hardness gradient}
A63B37/0044 (Hardness gradient) appears on 288 US grants and 340 published applications in this corpus.
Search patents in A63B- Granted patents
- 288
- Published applications
- 340
- Assignees
- 15
- Inventors
- 77
- Latest grant
- 10 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 2 | 12 |
| 2010 | 7 | 13 |
| 2011 | 8 | 12 |
| 2012 | 12 | 12 |
| 2013 | 5 | 19 |
| 2014 | 13 | 36 |
| 2015 | 31 | 42 |
| 2016 | 32 | 46 |
| 2017 | 35 | 43 |
| 2018 | 35 | 33 |
| 2019 | 45 | 28 |
| 2020 | 25 | 13 |
| 2021 | 10 | 6 |
| 2022 | 6 | 3 |
| 2023 | 9 | 8 |
| 2024 | 8 | 6 |
| 2025 | 2 | 2 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Golf ball10 Feb 2026US 12,544,628 B2Sumitomo Rubber Industries, Ltd.
- Golf ball including metal foam layer16 Dec 2025US 12,496,497 B2Acushnet Company
- Multi-piece solid golf ball20 May 2025US 12,303,745 B2Bridgestone Sports Co.Ltd.
- Golf ball core hardness gradient manipulation using hardness agent and water releasing agent31 Dec 2024US 12,179,067 B2Acushnet Company
- X-ray detectable polymers for golf balls12 Nov 2024US 12,138,510 B1Topgolf Callaway Brands Corp.
- Golf ball including metal foam layer9 Apr 2026US 2026/0097265 A1Acushnet Company
- Golf ball including metal foam layer9 Apr 2026US 2026/0097266 A1Acushnet Company
- Golf ball9 Apr 2026US 2026/0097267 A1Sumitomo Rubber Industries, Ltd.
- Golf ball29 Jan 2026US 2026/0027422 A1Sumitomo Rubber Industries, Ltd.
- Golf ball18 Dec 2025US 2025/0381452 A1Sumitomo Rubber Industries, Ltd.
Most cited
By later US patents
- Solid three-piece golf ball328US 5,184,828 AIlya Co. Ltd. · 1993
- Negative hardness gradient inner core for dual core golf ball79US 7,410,429 B1Acushnet Company · 2008
- Multi-layer core golf ball having opposing hardness gradient with steep gradient outer core layer44US 7,744,489 B2Acushnet Company · 2010
- Dual core golf ball having negative-hardness-gradient thermoplastic inner core and steep positive-hardness-gradient thermoset outer core layer42US 7,815,526 B2Acushnet Company · 2010
- Dual core golf ball having negative-hardness-gradient thermoplastic inner core and shallow positive-hardness-gradient thermoset outer core layer36US 7,946,934 B2Acushnet Company · 2011