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 |
| 4744103 | Computer controlled multi-link communication system A multi-link communication system includes a number of stations and interconnecting audio links under the control of a central computer. Each station is addressable by the computer for connecting selected stations to a selected audio link for establishing... | 05/10/1988 |
| 4677541 | Programmable clock A user-programmable clock is provided for executing events defined by functions executed at a particular time and selected zones and for selected schedules. The clock includes an event memory for receiving zone and schedule data from a keyboard by way of ... | 06/30/1987 |
| 4490050 | Master/slave clock system A master/slave clock system including a slave clock configured for inexpensive and reliable control from the master. Each slave clock has an unregulated d-c supply adapted to be supplied with a-c power from the master clock. Threshold switching means in e... | 12/25/1984 |
| 4387420 | Programmable clock A user programmable clock which is both simple to program and capable of executing relatively complex events. The front panel has a display divided into a plurality of functional blocks, with an operator positionable pointer adapted to activate any block.... | 06/07/1983 |
| 4081614 | Supervised single link telephone system An administrative telephone system for use in schools, hospitals and the like which includes a dialable administrative telephone set and a plurality of dialless remote or "staff" telephone stations having identifying numbers, interconnected by a central e... | 03/28/1978 |
| 4016502 | Dynamic range extender circuit for preamplifier An input amplifier stage for a microphone which includes a transistor having a load circuit including a load resistor and an emitter resistor. In a preferred embodiment, using a transistor of the NPN type, a volume control potentiometer is provided having... | 04/05/1977 |
