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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 |
| 5135440 | System of water toys which may be assembled in play groupings A child's water toy comprises a pool which has inflatable (with either air or water) sides with a floor extending between them. One or a number of applique accessories may be heat sealed to the bottom or the sides of the pool. Exemplary of these applique ... | 08/04/1992 |
| 5042008 | Non-volatile semiconductor memory device having word lines ("control gates") embedded in substrate A non-volatile memory device is fabricated on a semiconductor substrate structure and comprises a word line formed by a buried layer in the semiconductor substrate structure and a plurality of memory cells associated with the word line, and each of the me... | 08/20/1991 |
| 5036880 | High efficiency plate valve for reciprocating compressor A valve for reciprocating compressors generally comprising a seat member, a movable plate member, a flat spring plate, and a guard which are assembled as a unitary structure. The seat member and the plate member have linear fluid passage ports which are o... | 08/06/1991 |
| 5031255 | Whirlpool A whirlpool home appliance is built into a U-shaped housing for fitting over and clamping to the side of a bath tub. A water pump is in the side of the housing which is in the bath tub in order to energize the water in the tub. An air pump is in the side ... | 07/16/1991 |
| 5004507 | Aqueous-alcohol fructose crystallization A process for crystallizing an aqueous fructose feed stream uses an alcohol mixture which may be crystallized in either a vacuum evaporator chamber or a cooled atmospheric pressure crystallizer. Various cooling cycles are described. When the atmospheric p... | 04/02/1991 |
| 5003228 | Plasma display apparatus The invention provides voltage potential differences for selectively discharging cells in a plasma display device, with greater brightness and reduced power consumption. The plasma display device has orthogonally related electrodes sealed in an atmosphere... | 03/26/1991 |
| 5001659 | Structure for connecting a rotatable body to a stationary body A structure for connecting a cover of a portable lap-top personal computer, word processor or similar equipment having a display rotatably to a case which accommodates a body of the computer or word processor. The case and cover are electrically interconn... | 03/19/1991 |
| 5000279 | Unmanned vehicle guide system An unmanned vehicle guide system has guide routes made of a magnetic material and an unmanned vehicle guided to travel on the guide route. The unmanned vehicle has an exciting coil for emitting a magnetic field, a pair of detection coils, arranged in a di... | 03/19/1991 |
| 4999590 | Four state phase shift modulator, in particular for amplitude modulation of two carriers in quadrature with a large number of states A QPSK modulator has a signal generator which generates four carrier outputs having respective phases of 0°, 90°, 180°, and 270°. A four input phase selector is connected to the four outputs of the generator, has four modulator signal inputs, and has ... | 03/12/1991 |
| 4995155 | Shower shaver A shower shaver is made from two plastic piece parts. A first part is a handle in the nature of a pipe terminating in a fan-shaped or flared, tray like top surface. The other piece part is a cover or top which fits over and cooperates with the tray top to... | 02/26/1991 |
| 4992287 | Process for treatment of meat A procedure for processing meat to tenderize it and/or improve its texture and its appearance during storage or preservation, characterized by the steps of introducing the meat into an enclosure, placing it under vacuum, pressurizing it to a pressure abov... | 02/12/1991 |
| 4990460 | Fabrication method for thin film field effect transistor array suitable for liquid crystal display In a method of fabricating thin film field effect transistor array by forming gate bus lines and drain bus lines in the form of a matrix on a light transmissive insulating film, forming thin film field effect transistors in the vicinity of each crossing p... | 02/05/1991 |
| 4984583 | Air bubbling mats for therapeutically agitating bath water An air bubbling mat, which may be placed in the bottom a bath tub, provides a turbulence within the water. The mat includes three hinged or plugged in, and hollow blow molded sections with depressions on one side to form air passage ways through the hollo... | 01/15/1991 |
