G03B 21/132
Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
Official title: Overhead projectors, i.e. capable of projecting hand-writing or drawing during action (epidiascopic projectors G03B21/08)
G03B21/132 (Overhead projectors, i.e. capable of projecting hand-writing or drawing during action) appears on 329 US grants and 45 published applications in this corpus.
Search patents in G03B- Granted patents
- 329
- Published applications
- 45
- Assignees
- 115
- Inventors
- 437
- Latest grant
- 25 Mar 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 2 | 0 |
| 1978 | 6 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 6 | 0 |
| 1987 | 8 | 0 |
| 1988 | 14 | 0 |
| 1989 | 12 | 0 |
| 1990 | 21 | 0 |
| 1991 | 15 | 0 |
| 1992 | 13 | 0 |
| 1993 | 21 | 0 |
| 1994 | 25 | 0 |
| 1995 | 29 | 0 |
| 1996 | 18 | 0 |
| 1997 | 17 | 0 |
| 1998 | 20 | 0 |
| 1999 | 10 | 0 |
| 2000 | 9 | 0 |
| 2001 | 5 | 1 |
| 2002 | 10 | 5 |
| 2003 | 6 | 1 |
| 2004 | 2 | 3 |
| 2005 | 4 | 5 |
| 2006 | 2 | 1 |
| 2007 | 1 | 0 |
| 2008 | 2 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 4 |
| 2011 | 0 | 3 |
| 2012 | 2 | 7 |
| 2013 | 2 | 1 |
| 2014 | 3 | 1 |
| 2015 | 1 | 2 |
| 2016 | 2 | 0 |
| 2017 | 1 | 1 |
| 2018 | 1 | 1 |
| 2019 | 1 | 1 |
| 2020 | 2 | 3 |
| 2021 | 2 | 1 |
| 2022 | 0 | 1 |
| 2023 | 1 | 2 |
| 2024 | 1 | 0 |
| 2025 | 3 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
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- Presenter having head part to control shooting direction24 Aug 2023US 2023/0269476 A1
- Image display method and projector16 Mar 2023US 2023/0080888 A1Seiko Epson Corporation
- Optical Devices Having Dichroic Beam Combiners, Optical Devices for Use with Dichroic Beam Combiners, and Methods of Manufacture Therefor6 Oct 2022US 2022/0317467 A1Lumus Ltd.
- Aligning and merging contents from multiple collaborative workstations1 Apr 2021US 2021/0097719 A1Konica Minolta Business Solutions U.S.A., Inc.
- Projected Augmented Reality Interface with Pose Tracking for Directing Manual Processes22 Oct 2020US 2020/0334851 A1
Most cited
By later US patents
- Interactive display system299US 5,448,263 ASmart Technologies Inc. · 1995
- Projection display system with pressure sensing at screen, and computer assisted alignment implemented by applying pressure at displayed calibration marks230US 6,337,681 B12002
- Projection display and system with pressure sensing at screen, and computer assisted alignment implemented by applying pressure at displayed calibration marks204US 6,747,636 B2Smart Technologies Inc. · 2004
- Projection display system with touch sensing on screen, computer assisted alignment correction and network conferencing198US 6,141,000 ASmart Technologies Inc. · 2000
- Light fixture providing normalized output175US 4,791,540 AMinnesota Mining and Manufacturing Company · 1988