G01P 3/48
By measuring frequency of generated current or voltage
Official title: by measuring frequency of generated current or voltage {(in general G01R23/00)}
G01P3/48 (By measuring frequency of generated current or voltage) appears on 3,090 US grants and 2,097 published applications in this corpus.
Search patents in G01P- Granted patents
- 3,090
- Published applications
- 2,097
- Assignees
- 1,271
- Inventors
- 5,710
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 67 | 0 |
| 1977 | 55 | 0 |
| 1978 | 42 | 0 |
| 1979 | 35 | 0 |
| 1980 | 41 | 0 |
| 1981 | 43 | 0 |
| 1982 | 45 | 0 |
| 1983 | 34 | 0 |
| 1984 | 37 | 0 |
| 1985 | 40 | 0 |
| 1986 | 38 | 0 |
| 1987 | 45 | 0 |
| 1988 | 43 | 0 |
| 1989 | 57 | 0 |
| 1990 | 49 | 0 |
| 1991 | 59 | 0 |
| 1992 | 49 | 0 |
| 1993 | 63 | 0 |
| 1994 | 40 | 0 |
| 1995 | 39 | 0 |
| 1996 | 77 | 0 |
| 1997 | 68 | 0 |
| 1998 | 88 | 0 |
| 1999 | 71 | 0 |
| 2000 | 82 | 0 |
| 2001 | 72 | 14 |
| 2002 | 67 | 42 |
| 2003 | 58 | 70 |
| 2004 | 54 | 90 |
| 2005 | 53 | 94 |
| 2006 | 61 | 81 |
| 2007 | 60 | 71 |
| 2008 | 51 | 97 |
| 2009 | 47 | 90 |
| 2010 | 50 | 102 |
| 2011 | 61 | 71 |
| 2012 | 68 | 58 |
| 2013 | 65 | 57 |
| 2014 | 49 | 73 |
| 2015 | 69 | 97 |
| 2016 | 66 | 79 |
| 2017 | 78 | 98 |
| 2018 | 75 | 95 |
| 2019 | 93 | 96 |
| 2020 | 93 | 127 |
| 2021 | 90 | 123 |
| 2022 | 110 | 124 |
| 2023 | 100 | 71 |
| 2024 | 98 | 73 |
| 2025 | 66 | 68 |
| 2026 | 29 | 36 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Magnet-based detection system for detecting a movement of a movable object6 Oct 2026US 12,754,200 B2Fraba B.V.
- Rotational speed estimation method for incremental encoder29 Sep 2026US 12,748,125 B2Artery Technology Co., Ltd.
- Method, device and computer program for estimating a speed of a wheeled vehicle8 Sep 2026US 12,730,121 B2Institut National De Recherche En Informatique Et En Automatique
- Optical encoder with comparator hysteresis changed with rotating speed and operating method thereof1 Sep 2026US 12,724,035 B2Pixart Imaging Inc.
- Rear end steering and mounting system25 Aug 2026US 12,715,502 B2Super ATV, LLC
- Signal control method, signal control apparatus, signal control device, storage medium, and computer program product24 Sep 2026US 2026/0286958 A1Risun Technology (Shenzhen) Limited
- Rotation speed detection apparatus, rotation speed detection system, rotation speed calculation apparatus, and rotation speed detection method27 Aug 2026US 2026/0254323 A1Asahi Kasei Microdevices Corporation
- Systems and methods for detecting an unbalanced load within a washing machine appliance20 Aug 2026US 2026/0242997 A1Haier US Appliance Solutions, Inc.
- Torque measurement based on bearing contact angle controlled by gear force reaction13 Aug 2026US 2026/0235462 A1Pratt & Whitney Canada Corp.
- Rotary power unit, two-stage speed reduction rotary power unit, and robot30 Jul 2026US 2026/0216892 A1Hangzhou Yushu Technology Co., Ltd.
Most cited
By later US patents
- Multi-bit encoder signal conditioning circuit having common mode disturbance compensation655US 5,291,133 AGeneral Motors Corporation · 1994
- Medication infusion system having optical motion sensor to detect drive mechanism malfunction617US 5,097,122 APacesetter Infusion, Ltd. · 1992
- Anti-kickback power tool control220US 4,267,914 ABlack & Decker Inc. · 1981
- Battery tach193US 5,004,979 ABear Automotive Service Equipment Company · 1991
- Semiconductor device having a plurality of semiconductor chips190US 6,133,637 ARohm Co., Ltd. · 2000