G09D 3/00
Perpetual calendars
G09D3/00 (Perpetual calendars) appears on 215 US grants and 101 published applications in this corpus.
Search patents in G09D- Granted patents
- 215
- Published applications
- 101
- Assignees
- 46
- Inventors
- 290
- Latest grant
- 28 Nov 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 9 | 0 |
| 1978 | 5 | 0 |
| 1979 | 4 | 0 |
| 1980 | 9 | 0 |
| 1981 | 9 | 0 |
| 1982 | 6 | 0 |
| 1983 | 10 | 0 |
| 1984 | 7 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 5 | 0 |
| 1988 | 3 | 0 |
| 1989 | 12 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 1 | 0 |
| 1993 | 9 | 0 |
| 1994 | 5 | 0 |
| 1995 | 6 | 0 |
| 1996 | 6 | 0 |
| 1997 | 3 | 0 |
| 1998 | 6 | 0 |
| 1999 | 6 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 1 |
| 2002 | 5 | 6 |
| 2003 | 8 | 8 |
| 2004 | 2 | 3 |
| 2005 | 5 | 7 |
| 2006 | 4 | 8 |
| 2007 | 4 | 7 |
| 2008 | 4 | 14 |
| 2009 | 2 | 10 |
| 2010 | 3 | 4 |
| 2011 | 3 | 4 |
| 2012 | 4 | 7 |
| 2013 | 6 | 2 |
| 2014 | 3 | 4 |
| 2015 | 2 | 2 |
| 2016 | 1 | 3 |
| 2017 | 7 | 4 |
| 2018 | 2 | 1 |
| 2019 | 2 | 1 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 2 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Never-ending calendar28 Nov 2023US 11,830,384 B2Bianhua Connects LLC
- Perpetual month display calendar29 Oct 2019US 10,460,629 B1
- Erasable loop scheduler with calendar17 Sep 2019US 10,417,939 B2
- Pre-printed surface for handwriting, comprising a pre-printed graphical representation of the passing of a period of time, and associated computer program16 Oct 2018US 10,102,464 B2Holdham
- Customized storage calendar28 Aug 2018US 10,062,305 B1
- Reconfigurable perpetual calendar device operable under ruderman method of making a weekday determination and method for periodic updating of the same16 Apr 2026US 2026/0105420 A1
- Reconfigurable perpetual calendar device operable under ruderman method of making a weekday determination and method for periodic updating of the same16 Apr 2026US 2026/0105867 A1
- Multifunctional intelligent calendar25 Sep 2025US 2025/0301592 A1Shenzhen Joyhong Tech Co., Ltd
- System and method for tracking face days of moon synched to gregorian dates4 Sep 2025US 2025/0278059 A1
- Never-ending calendar14 Apr 2022US 2022/0114917 A1Bianhua Connects LLC
Most cited
By later US patents
- Method for automatically reconciling entries on two copies of independently maintained electronic calendars163US 4,866,611 AInternational Business Machines Corporation · 1989
- Electronic calendaring method for confirmation of resource availability during event calendaring104US 4,807,155 AInternational Business Machines Corporation · 1989
- Method for concurrently displaying entries from a plurality of different electronic calendars based on interactively entered non-temporal criteria88US 4,831,552 AInternational Business Machines Corporation · 1989
- Electronic calendaring method which provides for automatic assignment of alternates in requested events84US 4,817,018 AInternational Business Machines Corporation · 1989
- Personalized calendar and system for making68US 5,457,904 A1995