H04L 9/3265
Using certificate chains, trees or paths
Official title: {using certificate chains, trees or paths; Hierarchical trust model}
H04L9/3265 (Using certificate chains, trees or paths) appears on 1,006 US grants and 1,156 published applications in this corpus.
Search patents in H04L- Granted patents
- 1,006
- Published applications
- 1,156
- Assignees
- 414
- Inventors
- 2,132
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 2 |
| 2002 | 5 | 11 |
| 2003 | 0 | 11 |
| 2004 | 4 | 12 |
| 2005 | 5 | 18 |
| 2006 | 8 | 23 |
| 2007 | 9 | 17 |
| 2008 | 12 | 10 |
| 2009 | 18 | 21 |
| 2010 | 17 | 23 |
| 2011 | 22 | 13 |
| 2012 | 19 | 21 |
| 2013 | 20 | 21 |
| 2014 | 25 | 29 |
| 2015 | 29 | 38 |
| 2016 | 38 | 38 |
| 2017 | 38 | 37 |
| 2018 | 33 | 57 |
| 2019 | 45 | 90 |
| 2020 | 66 | 104 |
| 2021 | 103 | 136 |
| 2022 | 103 | 117 |
| 2023 | 114 | 91 |
| 2024 | 113 | 85 |
| 2025 | 99 | 77 |
| 2026 | 51 | 54 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- In-memory certificate conversion system1 Oct 2026US 2026/0303371 A1Sap SE
- Chain of authentication using public key infrastructure1 Oct 2026US 2026/0303374 A1
- Chain of authentication using public key infrastructure1 Oct 2026US 2026/0303375 A1
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Most cited
By later US patents
- Public key/signature cryptosystem with enhanced digital signature certification510US 4,868,877 A1989
- Network message generation for automated authentication448US 8,819,253 B2Oracle America, Inc. · 2014
- Public key/signature cryptosystem with enhanced digital signature certification447US 5,005,200 A1991
- Public key/signature cryptosystem with enhanced digital signature certification408US 5,214,702 A1993
- Digital document time-stamping with catenate certificate358US 5,136,646 ABell Communications Research, Inc. · 1992