G03B 21/321
Holders for films
Official title: {Holders for films, e.g. reels, cassettes, spindles}
G03B21/321 (Holders for films) appears on 83 US grants and 12 published applications in this corpus.
Search patents in G03B- Granted patents
- 83
- Published applications
- 12
- Assignees
- 41
- Inventors
- 122
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 16 | 0 |
| 1977 | 11 | 0 |
| 1978 | 6 | 0 |
| 1979 | 5 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 5 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 5 |
| 2018 | 4 | 2 |
| 2019 | 5 | 0 |
| 2020 | 1 | 1 |
| 2021 | 1 | 1 |
| 2022 | 1 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Projection device23 Jun 2026US 12,663,699 B1
- Lighting device for projecting a starry pattern15 Nov 2022US 11,500,277 B2
- Projection system and control method of driving current therefor1 Jun 2021US 11,022,864 B2Coretronic Corporation
- Method for manufacturing separator web, method for manufacturing separator, separator web, and apparatus for manufacturing separator web26 May 2020US 10,665,838 B2Sumitomo Chemical Company, Limited
- Dynamic projection light10 Dec 2019US 10,503,060 B1
- Projection lamp9 Dec 2021US 2021/0381666 A1Shenzhen Bolong Technology Co. Ltd.
- Projection system and control method of driving current therefor28 May 2020US 2020/0166827 A1Coretronic Corporation
- Projection device for projecting images on a surface of the device9 Aug 2018US 2018/0224729 A1Kan Wah Kan Sum
- Suspended surface assembly and a method for deploying same2 Aug 2018US 2018/0215575 A1Tait Towers Manufacturing, LLC
- Film production method and film production device2 Nov 2017US 2017/0317327 A1Sumitomo Chemical Company, Limited
Most cited
By later US patents