G21K 1/04
Using variable diaphragms, shutters, choppers
Official title: using variable diaphragms, shutters, choppers
G21K1/04 (Using variable diaphragms, shutters, choppers) appears on 897 US grants and 749 published applications in this corpus.
Search patents in G21K- Granted patents
- 897
- Published applications
- 749
- Assignees
- 385
- Inventors
- 1,614
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 6 | 0 |
| 1978 | 7 | 0 |
| 1979 | 7 | 0 |
| 1980 | 9 | 0 |
| 1981 | 1 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 2 | 0 |
| 1985 | 6 | 0 |
| 1986 | 5 | 0 |
| 1987 | 9 | 0 |
| 1988 | 11 | 0 |
| 1989 | 11 | 0 |
| 1990 | 13 | 0 |
| 1991 | 18 | 0 |
| 1992 | 11 | 0 |
| 1993 | 12 | 0 |
| 1994 | 12 | 0 |
| 1995 | 10 | 0 |
| 1996 | 13 | 0 |
| 1997 | 12 | 0 |
| 1998 | 11 | 0 |
| 1999 | 6 | 0 |
| 2000 | 10 | 0 |
| 2001 | 13 | 6 |
| 2002 | 14 | 11 |
| 2003 | 13 | 13 |
| 2004 | 15 | 23 |
| 2005 | 16 | 24 |
| 2006 | 23 | 19 |
| 2007 | 22 | 28 |
| 2008 | 22 | 30 |
| 2009 | 25 | 27 |
| 2010 | 19 | 29 |
| 2011 | 19 | 24 |
| 2012 | 24 | 31 |
| 2013 | 20 | 43 |
| 2014 | 27 | 41 |
| 2015 | 50 | 52 |
| 2016 | 40 | 42 |
| 2017 | 35 | 50 |
| 2018 | 40 | 36 |
| 2019 | 38 | 24 |
| 2020 | 45 | 38 |
| 2021 | 27 | 40 |
| 2022 | 32 | 35 |
| 2023 | 26 | 39 |
| 2024 | 36 | 24 |
| 2025 | 25 | 14 |
| 2026 | 11 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Systems and methods for driving leaves in a multi-leaf collimator6 Oct 2026US 12,755,858 B2Shanghai United Imaging Healthcare Co., Ltd.
- Enclosed x-ray chopper wheel8 Sep 2026US 12,730,081 B2Videray Technologies, Inc.
- X-ray chopper wheel assembly and method25 Aug 2026US 12,718,966 B2Viken Detection Corporation
- Electron beam radiation system with collision detection functionality11 Aug 2026US 12,702,868 B2Intraop Medical Corporation
- Collimator apparatus and motion control method26 May 2026US 12,636,520 B2Jiangsu Rayer Medical Technology Co., Ltd
- Radiation source unit and measurement apparatus20 Aug 2026US 2026/0243562 A1Yokogawa Electric Corporation
- Dose distribution calculation system, program, and dose distribution calculation method16 Jul 2026US 2026/0204450 A1Hitachi High-Tech Corporation
- Adjustable radiotherapy collimator devices and systems2 Jul 2026US 2026/0183569 A1Board of Regents, The University of Texas System
- Control apparatus, kratzky block, control method and control program11 Jun 2026US 2026/0160715 A1Rigaku Corporation
- Direct-acting vertical lamellae drive14 May 2026US 2026/0135011 A1Varian Medical Systems, Inc.
Most cited
By later US patents
- Integrated variable-aperture collimator and fixed-aperture collimator1,021US 8,093,572 B2Accuray Incorporated · 2012
- Method for scanning an examination subject with a CT device331US 6,320,929 B1Siemens Aktiengesellschaft · 2001
- Mutileaf collimator for radiotherapy machines304US 4,868,844 AVarian Associates, Inc. · 1989
- Method and apparatus for proton therapy269US 5,668,371 AWisconsin Alumni Research Foundation · 1997
- Radiation therapy system with constrained rotational freedom245US 5,724,400 AWisconsin Alumni Research Foundation · 1998