G21K 4/00
Conversion screens for the conversion of the spatial distribution of x-rays or
Official title: Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens (photographic processes using X-ray intensifiers G03C5/17; discharge tubes comprising luminescent screens H01J1/62; cathode ray tubes for X-ray conversion with optical output H01J31/50)
G21K4/00 (Conversion screens for the conversion of the spatial distribution of x-rays or) appears on 1,155 US grants and 780 published applications in this corpus.
Search patents in G21K- Granted patents
- 1,155
- Published applications
- 780
- Assignees
- 285
- Inventors
- 1,501
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 16 | 0 |
| 1978 | 15 | 0 |
| 1979 | 4 | 0 |
| 1980 | 10 | 0 |
| 1981 | 12 | 0 |
| 1982 | 9 | 0 |
| 1983 | 13 | 0 |
| 1984 | 11 | 0 |
| 1985 | 31 | 0 |
| 1986 | 28 | 0 |
| 1987 | 22 | 0 |
| 1988 | 23 | 0 |
| 1989 | 33 | 0 |
| 1990 | 38 | 0 |
| 1991 | 51 | 0 |
| 1992 | 29 | 0 |
| 1993 | 15 | 0 |
| 1994 | 20 | 0 |
| 1995 | 27 | 0 |
| 1996 | 27 | 0 |
| 1997 | 22 | 0 |
| 1998 | 13 | 0 |
| 1999 | 16 | 0 |
| 2000 | 17 | 0 |
| 2001 | 24 | 10 |
| 2002 | 28 | 26 |
| 2003 | 18 | 31 |
| 2004 | 24 | 59 |
| 2005 | 17 | 62 |
| 2006 | 44 | 57 |
| 2007 | 53 | 42 |
| 2008 | 27 | 39 |
| 2009 | 26 | 23 |
| 2010 | 23 | 27 |
| 2011 | 11 | 26 |
| 2012 | 7 | 29 |
| 2013 | 28 | 35 |
| 2014 | 41 | 33 |
| 2015 | 27 | 35 |
| 2016 | 34 | 41 |
| 2017 | 37 | 29 |
| 2018 | 28 | 34 |
| 2019 | 30 | 29 |
| 2020 | 24 | 20 |
| 2021 | 27 | 26 |
| 2022 | 24 | 15 |
| 2023 | 11 | 12 |
| 2024 | 15 | 17 |
| 2025 | 10 | 14 |
| 2026 | 8 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G21K 2004/06Conversion screens for the conversion of the spatial distribution of x-rays orIndexing code357
- G21K 2004/12Conversion screens for the conversion of the spatial distribution of x-rays orIndexing code85
- G21K 2004/10Conversion screens for the conversion of the spatial distribution of x-rays orIndexing code78
- G21K 2004/08Conversion screens for the conversion of the spatial distribution of x-rays orIndexing code67
- G21K 2004/04Conversion screens for the conversion of the spatial distribution of x-rays orIndexing code59
- G21K 2004/02Conversion screens for the conversion of the spatial distribution of x-rays orIndexing code22
Recent patents
- Perovskite-organic chromophore based X-ray imagining scintillator6 Oct 2026US 12,755,859 B2King Abdullah University of Science and Technology
- Nanophotonic scintillators for high-energy particles detection, imaging, and spectroscopy29 Sep 2026US 12,748,060 B2Massachusetts Institute of Technology
- Mixed garnet oxide scintillators and corresponding systems and methods9 Jun 2026US 12,650,526 B2Radiation Monitoring Devices, Inc.
- Scintillator and charged particle radiation apparatus31 Mar 2026US 12,590,913 B2Hitachi High-Tech Corporation
- Optical waveguide sensor for detecting radioactive isotopes and method of fabricating the same24 Feb 2026US 12,560,727 B2Vulcan Photonics Sdn. Bhd.
- Scintillator structure14 May 2026US 2026/0133328 A1
- Transition metal element-doped garnet-type aluminate scintillation material with high-quality factor and preparation method and application thereof30 Apr 2026US 2026/0117122 A1Shanghai Institute of Ceramics, Chinese Academy of Sciences
- Optimized Scintillator Screens for Use in X-ray Imaging30 Apr 2026US 2026/0118527 A1Rapiscan Holdings, Inc.
- Nanophotonic purcell enhanced metamaterial scintillator9 Apr 2026US 2026/0098974 A1The Board of Trustees of the Leland Stanford Junior University
- Resin composition, cured product, scintillator panel, and inductor2 Apr 2026US 2026/0092142 A1Toray Industries, Inc.
Most cited
By later US patents
- X-ray backscatter detection system286US 5,181,234 AIRT Corporation · 1993
- Photoluminescent objects207US 9,057,021 B2Performance Indicator, LLC · 2015
- System for quantitative radiographic imaging202US 5,864,146 AUniversity of Massachusetts Medical Center · 1999
- Method for preparation of radiographic image conversion panel and radiographic image conversion panel thereby146US 4,947,046 AKonica Corporation · 1990
- Oxygen-containing phosphor powders, methods for making phosphor powders and devices incorporating same135US 6,180,029 B2Superior MicroPowders LLC · 2001