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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 6335201 | Method and apparatus for detecting enzymatic activity using molecules that change electrophoretic mobility The activity of intracellular chemical reactions of molecules is measured by the use of fluorescently labeled substrate molecules that undergo a change in electrophoretic mobility upon chemical reaction such as that catalyzed by an enzyme. Specificity is ... | 01/01/2002 |
| 6334761 | Check-valved silicon diaphragm pump and method of fabricating the same A silicone rubber diaphragm pump utilizing a pair of MEMS Parylene check valves and a miniature solenoid plunger and actuator is comprised of a spacer sandwiched by a silicone rubber diaphragm on one side and a check valve support on the other. The check ... | 01/01/2002 |
| 6297980 | Unified constant-frequency integration control of three-phase power corrected rectifiers, active power filters, and grid-connected inverters The unified constant-frequency integration (UCI) control method of the invention is based on one-cycle control. It employs an integrator with reset as its core component along with a few logic and linear components to control the pulse width of a three-ph... | 10/02/2001 |
| 6265976 | Method and apparatus for providing receiver dual channel coupling in a reader for RFID tags The invention reduces recovery time in a receiving coil or antenna of an RFID reader by generating a reference voltage that then clamps the node on which the desired signal is monitored. The coil is coupled to parallel channels. One channel has a recovery... | 07/24/2001 |
| 6249108 | Unified constant-frequency integration control of active power filters An switching converter (APF) is a device that is connected in parallel to and cancels the reactive and harmonic currents from a group of nonlinear loads so that the resulting total current drawn from the ac source is sinusoidal. What is provided is an uni... | 06/19/2001 |
| 6241480 | Micro-magnetohydrodynamic pump and method for operation of the same A micropump fabricated in a planar substrate is provided with a valving chamber which is communicated to a pumping chamber. The valving chamber has an inlet and outlet port. Both the valving chamber and pumping chamber have a liquid, electrically conducti... | 06/05/2001 |
| 6229443 | Apparatus and method for detuning of RFID tag to regulate voltage Overload protection is provided to the tuned receiving front end circuitry of an RFID tag by selectively detuning the tuned receiving front end in response to sensed voltage overload generated across the tuned receiving front end by a high field. The tune... | 05/08/2001 |
| 6227490 | Aircraft lavatory fluid leakage prevention system, or anti-blue icing system Blue icing can be prevented by an apparatus inside an aircraft. A sump is provided which has a removable screen cover disposed over an open-top container. The sump is placed underneath the aircraft's service valve, between the service valve and service do... | 05/08/2001 |
| 6219408 | Apparatus and method for simultaneously transmitting biomedical data and human voice over conventional telephone lines The present invention is an apparatus for simultaneously transmitting biomedical signals and human voice over a telephone. The invention is also a telephone line adapted to receive communication from the receiving unit at a second end of the line while si... | 04/17/2001 |
