B81B 3/0021
Transducers for transforming electrical into mechanical energy or vice versa
Official title: {Transducers for transforming electrical into mechanical energy or vice versa (dynamo-electric machines H02K99/00; electrostatic machines H02N1/00; piezoelectric devices H10N30/00)}
B81B3/0021 (Transducers for transforming electrical into mechanical energy or vice versa) appears on 1,161 US grants and 1,350 published applications in this corpus.
Search patents in B81B- Granted patents
- 1,161
- Published applications
- 1,350
- Assignees
- 423
- Inventors
- 2,036
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 4 | 0 |
| 2001 | 4 | 3 |
| 2002 | 8 | 13 |
| 2003 | 12 | 14 |
| 2004 | 16 | 10 |
| 2005 | 5 | 8 |
| 2006 | 4 | 8 |
| 2007 | 7 | 24 |
| 2008 | 17 | 12 |
| 2009 | 8 | 23 |
| 2010 | 15 | 24 |
| 2011 | 19 | 14 |
| 2012 | 13 | 27 |
| 2013 | 33 | 51 |
| 2014 | 57 | 69 |
| 2015 | 81 | 91 |
| 2016 | 54 | 67 |
| 2017 | 71 | 82 |
| 2018 | 70 | 89 |
| 2019 | 76 | 85 |
| 2020 | 97 | 96 |
| 2021 | 69 | 121 |
| 2022 | 83 | 120 |
| 2023 | 91 | 108 |
| 2024 | 87 | 83 |
| 2025 | 87 | 60 |
| 2026 | 63 | 48 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Engineered substrates, free-standing semiconductor microstructures, and related systems and methods6 Oct 2026US 12,753,068 B2Lawrence Semiconductor Research Laboratory, Inc.
- Microelectromechanical acceleration sensor29 Sep 2026US 12,748,127 B2Robert Bosch GmbH
- Method of fabricating micro-electromechanical system device22 Sep 2026US 12,741,865 B2Vanguard International Semiconductor Corporation
- Micro-electro-mechanical system device1 Sep 2026US 12,722,968 B2Vanguard International Semiconductor Corporation
- Process for manufacturing a micro-electro-mechanical device including two chambers at different pressures and related micro-electro-mechanical device1 Sep 2026US 12,722,969 B2STMicroelectronics S,r.l.
- Capacitive rf microswitch for high-power applications8 Oct 2026US 2026/0311937 A1
- Semiconductor device17 Sep 2026US 2026/0274648 A1Infineon Technologies AG
- Ultrasonic transceiver with stacked die back cavity10 Sep 2026US 2026/0265045 A1
- Acoustic devices with residual stress compensation3 Sep 2026US 2026/0261805 A1Skyworks Solutions, Inc.
- Mems microphone and mems accelerometer on a single substrate27 Aug 2026US 2026/0250120 A1Taiwan Semiconductor Manufacturing Company.Ltd
Most cited
By later US patents
- Laterally driven resonant microstructures419US 5,025,346 AThe Regents of the University of California · 1991
- Boron nutride membrane in wafer structure239US 5,270,125 ARedwood Microsystems, Inc. · 1993
- Microelectro-mechanical system actuator device and reconfigurable circuits utilizing same198US 6,127,908 AMassachusetts Institute of Technology · 2000
- Apparatuses and methods for manipulating droplets on a printed circuit board166US 8,349,276 B2Duke University · 2013
- Multi-directional thermal actuator129US 6,438,954 B13M Innovative Properties Company · 2002