|
| US4012647 | 1 Ago 1975 | 15 Mar 1977 | Ultrasonic Systems, Inc. | Ultrasonic motors and converters |
| US4197478 | 25 Ene 1979 | 8 Abr 1980 | Southwest Research Institute | Electronically tunable resonant accelerometer |
| US4249100 | 12 Abr 1979 | 3 Feb 1981 | | Drive means and force control for piezoelectric vibration motor |
| US4275363 | 9 Ago 1979 | 23 Jun 1981 | Taga Electric Co., Ltd. | Method of and apparatus for driving an ultrasonic transducer including a phase locked loop and a sweep circuit |
| US4277758 | 9 Ago 1979 | 7 Jul 1981 | Taga Electric Company, Limited | Ultrasonic wave generating apparatus with voltage-controlled filter |
| US4389601 | 8 Sep 1980 | 21 Jun 1983 | Sonobond Corporation | Power supply having automatic frequency control for ultrasonic bonding |
| US4409659 | 15 Dic 1980 | 11 Oct 1983 | Sonobond Ultrasonics, Inc. | Programmable power supply for ultrasonic applications |
| US4469974 | 14 Jun 1982 | 4 Sep 1984 | Eaton Corporation | Low power acoustic fuel injector drive circuit |
| US4642581 | 21 Jun 1985 | 10 Feb 1987 | Sono-Tek Corporation | Ultrasonic transducer drive circuit |
| US4687962 | 15 Dic 1986 | 18 Ago 1987 | Baxter Travenol Laboratories, Inc. | Ultrasonic horn driving apparatus and method with active frequency tracking |
| US4689515 | 24 Sep 1986 | 25 Ago 1987 | Siemens Aktiengesellschaft | Method for operating an ultrasonic frequency generator |
| US4703213 | 15 Jul 1986 | 27 Oct 1987 | | Device to operate a piezoelectric ultrasonic transducer |
| US4823775 | 9 Sep 1987 | 25 Abr 1989 | N.V. Verenigde Instrumentenfabrieken Enraf-Nonius | Apparatus for treating a patient with ultrasonic waves |
| US4849872 | 25 Ene 1988 | 18 Jul 1989 | | Process and apparatus for phase-regulated power and frequency control of an ultrasonic transducer |
| US4856901 | 4 May 1988 | 15 Ago 1989 | Kearfott Guidance & Navigation Corporation | Velocity control system using piezoelectric transducers |
| US4882525 | 30 Ago 1988 | 21 Nov 1989 | Undatim Ultrasonics S.A. | Method for controlling the working frequency of an electro-acoustic vibrating device |
| US4920649 | 16 Feb 1989 | 1 May 1990 | Aktiebolaget Electrolux | Arrangement in a chain saw |
| US4990835 | 26 Abr 1990 | 5 Feb 1991 | Alps Electric Co., Ltd. | Automotive motor-driven device controlling and driving system |
| US5165047 | 25 Feb 1992 | 17 Nov 1992 | Canon Kabushiki Kaisha | Driving circuit for vibration wave driven motor |
| US5214339 | 2 Jul 1991 | 25 May 1993 | Asmo Co., Ltd. | Circuit and method of driving an ultrasonic motor to method for driving an ultrasonic motor |
| US5270595 | 2 Oct 1984 | 14 Dic 1993 | United Technologies Corporation | Dynamic thermal compensation for a magnetostrictive actuator |
| US5318570 | 11 Jun 1991 | 7 Jun 1994 | Advanced Osseous Technologies, Inc. | Ultrasonic tool |
| US5324297 | 5 Mar 1991 | 28 Jun 1994 | Advanced Osseous Technologies, Inc. | Ultrasonic tool connector |
| US5532539 | 28 Jun 1994 | 2 Jul 1996 | Dr. Hielscher GmbH | Method and circuitry for the safe oscillation build-up of ultrasonic disintegrators |
| US5656881 | 2 Feb 1994 | 12 Ago 1997 | Canon Kabushiki Kaisha | Vibration wave driven motor |
| US5796213 | 3 Sep 1996 | 18 Ago 1998 | Matsushita Electric Industrial Co., Ltd. | Inverter power source apparatus using a piezoelectric transformer |
| US6259935 | 22 Jun 1998 | 10 Jul 2001 | Matsushita Electrical Industrial Co., Ltd. | Electro-mechanical-acoustic transducing device |
| US6392327 | 29 Mar 2000 | 21 May 2002 | James L. Sackrison | Sonic transducer and feedback control method thereof |
| US6617966 | 10 Oct 2001 | 9 Sep 2003 | NEC Corporation | Compound acoustic actuator drive circuit and portable information terminal |
| US6686833 | 25 Feb 2003 | 3 Feb 2004 | NEC Corporation | Compound acoustic actuator drive circuit and portable information terminal |
| US6727988 | 11 Abr 2001 | 27 Abr 2004 | Korea Advanced Institute of Science and Technology | Spectrophotometer with drive means and Spectrophotometry using such |
| US6836054 | 11 Sep 2001 | 28 Dic 2004 | Face International Corp. | Thickness mode piezoelectric transducer with resonant drive circuit |
| US7651455 | 20 Sep 2004 | 26 Ene 2010 | Free Flow Packaging International, Inc. | Method for making paper dunnage |
| US7812504 | 27 Jun 2008 | 12 Oct 2010 | Microtrend Systems Inc. | Apparatus for high efficiency, high safety ultrasound power delivery with digital efficiency indicator and one clock cycle shutdown |
