Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5990655 | Method of operating an inverter for powering an induction motor An inverter is operated to eliminate hiss in the control of the speed of an induction motor using an inverter of variable frequency. The voltage is matched to the selected frequency to avoid such hiss and control of the voltage is effected by regulating s... | 11/23/1999 |
| 5859769 | Piloting system for electric inverter The MOSFETs or IGBTs of respective arms of an electronic inverter are in series with SCRs or TRIACs triggered into conduction during intervals of intended conduction of the respective MOSFETs or IGBTs connected to the high level rectifier terminal. The pi... | 01/12/1999 |
| 5832553 | Washing procedure and washing machine for the performance of the aforementioned procedure A washing procedure with a washing machine composed of alternate agitation (A) and agitation stoppage (S) phases for the laundry in a washing mixture (M) and a simultaneous phase, in which the washing mixture (M) is heated. Pursuant to the invention, the ... | 11/10/1998 |
| 5489833 | Three-phase electronic inverter for variable speed motor A three-phase electronic inverter for an electric induction motor can operate the latter silently without the generation of magnetorestriction noise where the voltage of the rectifier outputted to the power transistor bridge is controlled by a TRIAC with ... | 02/06/1996 |
