G21G 4/00
Radioactive sources
Official title: Radioactive sources (producing neutrons or other subatomic particles, X- or gamma rays, in fusion reactors G21B, in nuclear reactors G21C, by cosmic radiation G21H7/00, in accelerators H05H; X-ray tubes H01J35/00; gamma masers H01S4/00)
G21G4/00 (Radioactive sources) appears on 601 US grants and 608 published applications in this corpus.
Search patents in G21G- Granted patents
- 601
- Published applications
- 608
- Assignees
- 344
- Inventors
- 1,392
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 9 | 0 |
| 1978 | 5 | 0 |
| 1979 | 2 | 0 |
| 1980 | 5 | 0 |
| 1981 | 6 | 0 |
| 1982 | 4 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 5 | 0 |
| 1988 | 7 | 0 |
| 1989 | 9 | 0 |
| 1990 | 1 | 0 |
| 1991 | 6 | 0 |
| 1992 | 5 | 0 |
| 1993 | 5 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 5 | 0 |
| 1997 | 5 | 0 |
| 1998 | 5 | 0 |
| 1999 | 5 | 0 |
| 2000 | 14 | 0 |
| 2001 | 9 | 3 |
| 2002 | 14 | 6 |
| 2003 | 14 | 22 |
| 2004 | 12 | 21 |
| 2005 | 10 | 14 |
| 2006 | 14 | 28 |
| 2007 | 12 | 15 |
| 2008 | 3 | 20 |
| 2009 | 20 | 16 |
| 2010 | 8 | 22 |
| 2011 | 12 | 15 |
| 2012 | 12 | 11 |
| 2013 | 15 | 23 |
| 2014 | 17 | 17 |
| 2015 | 13 | 19 |
| 2016 | 15 | 23 |
| 2017 | 23 | 35 |
| 2018 | 18 | 28 |
| 2019 | 26 | 35 |
| 2020 | 39 | 46 |
| 2021 | 20 | 38 |
| 2022 | 34 | 30 |
| 2023 | 29 | 30 |
| 2024 | 32 | 31 |
| 2025 | 30 | 35 |
| 2026 | 21 | 25 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Materials and processes for generating radioisotopes6 Oct 2026US 12,755,857 B2AdvanCell IPCo US No. 1 Pty Ltd
- Purification process for the preparation of non-carrier added copper-6429 Sep 2026US 12,749,589 B2Curium US LLC
- Radio frequency quadrupole linear accelerator, neutron source system, and radio frequency quadrupole linear accelerator manufacturing method29 Sep 2026US 12,750,943 B2Riken
- Purification process for the preparation of non-carrier added copper-648 Sep 2026US 12,731,702 B2Curium US LLC
- Copper-64 compositions and formulations25 Aug 2026US 12,718,963 B1Curium US LLC
- Purification process for the preparation of non-carrier added copper-6417 Sep 2026US 2026/0279612 A1Curium US LLC
- Alpha-Emitting Isotope Generator and Method for Producing Alpha-Emitting Isotope17 Sep 2026US 2026/0279613 A1TAG1 Inc.
- Methods of forming radioactive articles and related radioactive articles10 Sep 2026US 2026/0269096 A1Battelle Energy Alliance, LLC
- Noble Gas-Based Nuclear Voltaic Power Source Using Radioisotopes in Aerosol Form10 Sep 2026US 2026/0269097 A1Nubatt Pte. Ltd.
- Radionuclide production system and radionuclide production method27 Aug 2026US 2026/0253758 A1Hitachi High-Tech Corporation
Most cited
By later US patents
- Endocurietherapy293US 5,342,283 A1994
- Hollow-tube brachytherapy device186US 5,713,828 AInternational Brachytherapy s.a. · 1998
- Radioactive medical device and process155US 6,010,445 AImplant Sciences Corporation · 2000
- X-ray-emitting interstitial implants149US 4,702,228 ATheragenics Corporation · 1987
- Pellet for a radioactive seed146US 5,163,896 ABest Industries, Inc. · 1992