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!
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| Number | Title | Issue Date |
| 4929005 | Device for transferring electric power A device for transferring electric power and/or information between two parts which are movable one with respect to the other, in particular between a door frame and a door leaf or an opening window leaf, mounted in this door frame, comprising a first coi... | 05/29/1990 |
| 4460936 | Condenser A condenser including a dielectric material exhibiting a ferroelectric phase wherein the dielectric constant-temperature characteristic of the condenser exhibits hysteresis loss of not more than 5% is provided. The dielectric constant-temperature characte... | 07/17/1984 |
| 4460649 | Composite fiber The present invention relates to a composite fiber consisting of two components, for example, such as a polyamide and a polyester, and to a multi-segment fiber wherein the two components thereof can be separated into a plurality of microfibers by chemical... | 07/17/1984 |
| 4458526 | Apparatus for measuring tire uniformity The automotive tire being measured is loaded in advance by the load applying means, and the drum is driven to rotate the tire. A displacement of the rotatable shaft produced in response to a variation in the radial force acting between the tire and the dr... | 07/10/1984 |
| 4454927 | Reentrant cone driven loudspeaker A miniaturized cone driven reentrant loudspeaker is provided. A cone spea is positioned within a housing. The housing includes a front wall for radiating sound and a side wall. The cone speaker is directed towards a reflector back plate having a generall... | 06/19/1984 |
| 4448617 | Steel for a vehicle suspension spring having good sag-resistance A steel for use in a vehicle suspension spring having a good sag-resistance comprising by weight 0.50-0.80% carbon, 1.50-2.50% silicon, 0.50-1.50% manganese, a member or members selected from a group consisting of 0.05-0.50% vanadium, 0.05-0.50% niobium a... | 05/15/1984 |
| 4447894 | Semiconductor memory device Generally speaking, in accordance with the invention, a semiconductor memory device comprises a static RAM cell having a serial-parallel data conversion function, formed of seven transistors. The RAM can read/write and includes bit lines exclusively for r... | 05/08/1984 |
| 4444073 | Torque transfer mechanism with hydraulic control system for a four wheel drive vehicle A four wheel drive torque transfer mechanism with a hydraulic control system is switchable between two wheel drive and four wheel drive during running of a vehicle having an automatic transmission. When a two wheel drive mode of operation is selected, the hydr... | 04/24/1984 |
| 4442729 | Lubricating system for four-wheel drive torque transfer mechanism Pressurized lubricant from a vehicle transmission is inputted to a lubrication system of a four-wheel drive torque transfer mechanism through a cental oil passage in the transmission's output shaft. The transmission shaft coaxially joins with a shaft of t... | 04/17/1984 |
| 4440504 | Electronic timepiece including a piezoelectric alarm An electronic timepiece including a piezoelectric type alarm buzzer wherein the caseback functions as the buzzer diaphragm is provided. The piezoelectric element is mounted on the caseback and a battery for driving the timepiece is mounted on the piezoele... | 04/03/1984 |
| 4436436 | Detection circuit for an electronic timepiece A detection circuit for an electronic timepiece for ascertaining whether the power supply has been properly applied. A first switching element is in parallel with a capacitor and a second switching element is in series. A booster circuit raises the batter... | 03/13/1984 |
| 4436435 | Analog and digital display timepiece A timepiece including an analog display of time and a digital display of time is provided. The analog display includes at least an hour hand and a minute hand with the digital display disposed within the region between the analog dial and the cover glass ... | 03/13/1984 |
| 4436252 | Tension shaft for winding frames A tension shaft for machines for winding widths of sheet material wherein the outside diameter is variable is provided. The tension shaft includes a flexible tube wound thereabout in helical fashion which may be inflated by air fed into the central portio... | 03/13/1984 |
| 4435089 | Power circuit for an electronic timepiece A timepiece includes in addition to the conventional timekeeping circuits, high load, that is, high current circuits such as an alarm driving circuit and a lamp driving circuit. Low load, small current systems such as the oscillator, divider, display driv... | 03/06/1984 |
| 4434430 | Ink jet printer head An ink jet head for a printer for ejecting liquid ink as droplets onto a recording medium, comprises a substrate having a nozzle, pressure chamber and passageway which are defined in a surface thereof, and a vibration plate supporting thereon a piezoelect... | 02/28/1984 |
| 4433925 | Manually-operated dot printer for pocket sized calculators A manually operated dot printer designed for use in a pocket sized calculator or a small sized electronic device includes a printing head which is manually movable across a sheet of printing paper in one direction. A pulse generating circuit produces a si... | 02/28/1984 |
| 4432616 | Frame for a pair of spectacles A spectacle frame holds each lens against a rim by a thin wire, providing a rimless appearance. The wire has at least one enlarged end for engagement in one end of the rim. The wire is secured at the other end of the rim for compressively retaining the le... | 02/21/1984 |
| 4432181 | Wall construction for architectural structure A wall construction for use as an outer wall, a roof or the like in an architectural structure is disclosed which is capable of effectively accomplishing sound absorption and insulation and heat insulation. The wall construction includes a first coat memb... | 02/21/1984 |
| 4431272 | Liquid crystal display device A liquid crystal display device including an opaque reflective electrode on the lower plate of the device is provided. The surface of the electrode is a rugged surface wherein the average angle of inclination of an inclined plane passing through the incli... | 02/14/1984 |
| 4428802 | Palladium-nickel alloy electroplating and solutions therefor A palladium-nickel alloy plating solutions formed from tetramminepalladous chloride is provided. The tetramminepalladous chloride is soluble in aqueous ammonia plating solution and is also water soluble. This permits replenishment of the palladium in a pa... | 01/31/1984 |
| 4427266 | Driving system for matrix liquid crystal display with nonlinear-switches The display matrix includes a non-linear element with two terminals connected in series with each liquid crystal element in the matrix panel. The matrix uses generalized AC amplitude selective multiplexing driving voltages. Scanning electrode voltage ampl... | 01/24/1984 |
| 4423929 | Multi-layer display device A multi-layer display device including at least two liquid crystal display cells overlapping along a line of sight is provided. Adjacent display cell layers may share a common transparent plate therebetween. Patterns are displayed by selectively applying ... | 01/03/1984 |
| 4421559 | Jet printing ink composition An aqueous fluid ink particularly well suited for use in an ink jet printer is provided. The aqueous fluid ink compositions include a humectant in combination with urea for efficiently lowering the freezing point without a significant increase in viscosit... | 12/20/1983 |
| 4417785 | Liquid crystal display with negative timing signal and dielectric inversion A liquid crystal display device includes a display element containing a liquid crystal display composition for operating in the twisted nematic mode and a two-frequency matrix-addressing circuit for driving the display element. The liquid crystal composit... | 11/29/1983 |
| 4408911 | Ink ribbon winding and reversing assembly An ink ribbon winding and reversing assembly suitable for use in a printer having two ratchet wheels for winding ink ribbon spools and an ink ribbon cassette having two rotatably mounted ink ribbon spools is provided. The assembly includes a feeding lever... | 10/11/1983 |
| 4404236 | High pressure chemical vapor deposition A process for carrying out chemical vapor deposition under increased pressure is provided. By carrying out chemical vapor deposition under increased pressure, a boundry layer of reduced thickness is formed which permit formation of a chemical vapor reacti... | 09/13/1983 |
| 4401738 | X-Ray lithography mask An X-ray mask including a pattern of X-ray absorbing material on a thin membrane is provided. The mask includes overlapping first and second patterns of X-ray absorbing material. This permits X-ray lithography printing of lines in complex patterns require... | 08/30/1983 |
| 4386564 | Serial printer A serial printer wherein a print head is reversibly displaced transverse to a print medium by an open looped grooved rotating cylindrical cam is provided. A unidirectional drive shaft is operatively coupled to the cam by a drive gear engaged with planet g... | 06/07/1983 |
| 4384989 | Semiconductive barium titanate Semiconductive barium titanate having a positive temperature coefficient of resistance comprises a barium titanate semiconductor including barium titanate and a small quantity of a doping element, and at least one additive selected from among silicon nitr... | 05/24/1983 |
| 4380770 | Ink jet printer An ink jet printer includes pumped-forced circulation of ink through the printer head and a nozzle cap which together eliminate gas from the ink supply and overcome ink stagnation which adversely affect printing quality. Ink from a tank circulates through... | 04/19/1983 |
| 4376567 | Liquid crystal display device A two-layer twisted nematic type liquid crystal display device for providing improved contrast is provided. The interior surfaces of the transparent electrode plates of the cells have been treated so that the long axes of the liuqid crystal molecules adja... | 03/15/1983 |
| 4376533 | Push and pull type exercising device In a physical exerciser of the push and pull type in which an elongate telescopic system is contractable against the force of a spring by pushing handles together or by pulling apart tension elements connecting the handles, the improvement that the ends o... | 03/15/1983 |
| 4373439 | Character ring-selecting type printer Character rings mounted on a common shaft and having a plurality of circumferential character columns thereon, are opposed by a platen including recessed portions. A recessed portion faces non-printing character columns when the platen presses against one... | 02/15/1983 |
| 4373438 | Dot printer A rounded end on a pivoted arm impacts a print medium through an ink ribbon to form a printed dot on the print medium. For printing, a wire drawn by an electromagnet acts on the arm between the pivot axis and the rounded end. A plurality of arms and elect... | 02/15/1983 |
| 4369671 | Torque transfer mechanism with hydraulic control system for a four wheel drive vehicle A four wheel drive torque transfer mechanism with a hydraulic control system is switchable between two wheel drive and four wheel drive during running of a vehicle having an automatic transmission. A reducer permits direct coupling or reduced speed ratio ... | 01/25/1983 |
| 4367480 | Head device for ink jet printer A head for an ink-on-demand type ink jet printer includes two laterally offset, linear rows of ink nozzles, said nozzle rows being linearly offset for producing alternate dots of a continuous printed line of dots. Interconnected chambers and channels, for... | 01/04/1983 |
| 4366915 | Hinged lid container A plastic lid having a hinge formed in a planar panel is connected to a container body without use of hardware. An integral lid catch using no hardware, engages in the container body to close the container. Containers comprise two or three pieces.... | 01/04/1983 |
| 4365898 | Time-correcting mechanism for electronic timepiece A time-correcting mechanism is actuated by a single external member which is rotated, pushed and pulled. Data representative of the rotational speed of the external member is stored in memory and the digital time display is subsequently adjusted in predet... | 12/28/1982 |
| 4364067 | Highly integrated ink jet head A head for an ink-on-demand jet dot printer is highly integrated to provide a large plurality of closely spaced dots by combining more than one head of lesser dot density as components of a single unit. The dots from the separate component heads are inter... | 12/14/1982 |
| 4364066 | Ink jet printing head An ink jet printing head of simple construction includes two supply channels and a pressure chamber which are substantially coplanar with the nozzle. A piezoelectric element acts to decrease the pressure chamber volume and eject an ink droplet from the no... | 12/14/1982 |
