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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 5174758 | Color selector for four-color offset printing, and method of creating it A color swatch arrangement for use in selecting colors for four-color offset printing, and a method for creating such an arrangement, involves dividing the visible spectrum into a plurality of distinct hues, and determining the proportions of yellow, red,... | 12/29/1992 |
| 5140637 | Device and method for removing vocal signals A vocal signal removing device includes a member for connecting one of the left or right side positive output terminals of a stereophonic sound reproducing device, e.g., tape, compact disk, or phonograph player, to the corresponding left or right side pos... | 08/18/1992 |
| 5114345 | Process and apparatus for representing tidal movement An ellipse is rotated in such a way that the time interval which elapses between the successive passages of the major axis of the ellipse and the minor axis of the ellipse through the same position corresponds to the time interval which elapses between a ... | 05/19/1992 |
| 5096712 | Method for enhancing performance so as to improve vigor and decrease fatigue, confusion, tension, and anxiety A composition for enhancing performance, e.g., improving subjective vigor, decreasing fatigue, diminishing subjective confusion, and decreasing tension and anxiety. The composition comprises an indirect-acting sympathomimetic drug and tyrosine or a tyrosi... | 03/17/1992 |
| 5095238 | Brushless dc motor and rotor magnet A brushless dc motor comprising a stator, and a rotor incorporating a hollow cylindrical permanent magnet. The rotor magnet has sectors magnetized radially in opposite directions to define poles of opposite polarity extending around the circumference of t... | 03/10/1992 |
| 5070252 | Automatic transfer switch An automatic transfer switch having two sets of phase switches, one set for connection between a normal source of power and a load, and the other set for connection between an emergency power source and the load. The transfer switch includes two pairs of ... | 12/03/1991 |
| 5066840 | Manual operator for an electrical switch A manual operator for opening and closing an electrical switch, including a switch-driving element, a relatively rotatable handle element, and a resilient transmission, e.g., a leaf spring or springs, extending between the two elements. An abutment is fix... | 11/19/1991 |
| 5050402 | Container for temperature-controlled and environmentally controlled transport of perishable goods The invention is directed to a container for environmentally controlled and temperature-regulated transport of perishable goods, the environment-controlling unit being arranged in the essentially cuboid container in the region of the one end face thereof ... | 09/24/1991 |
| 5046428 | Shell for a propellant charge The case of a composite propellent charge cartridge exhibits cracks, after shooting, at the sharp transition of the extractor rim. This has a disadvantageous effect on the number of possible reloadings. The present case permits frequent reloading with lit... | 09/10/1991 |
| 5031544 | Railroad car connection assembly with movable platform adjustably connected to the car to coincide with movement of car buffers A connecting platform for use with the end of a railroad car, the platform cooperating with a connecting platform of another car articulated to the railroad car, both railroad cars having the usual spring-biased buffers. The connecting platform includes a... | 07/16/1991 |
| 5032812 | Solenoid actuator having a magnetic flux sensor A solenoid actuator comprising a coil or coils of electrical wire and a plugnut and movable core within the coil(s). A magnetic yoke surrounds the coil(s), the axis of the latter extending across the magnetic circuit defined by the yoke. Relatively large ... | 07/16/1991 |
| 5021681 | Jiter-invariant switched capacitor pulse shaper An output pulse signal can be fabricated in an integrated circuit from an input signal. The output signal retains the desired pulse shape unaffected by jitter. A switched capacitor FIR filter is used to form the pulse shape, and then the clocking of the d... | 06/04/1991 |
| 5019594 | Method for decreasing appetite A composition for decreasing appetite comprising an indirect-acting sympathomimetic drug and tyrosine or a tyrosine precursor. The drug may be phenylpropanolamine, amphetamine, or ephedrine. The tyrosine enhances the known appetite-suppressing activity of... | 05/28/1991 |
| 5010614 | Articulated bridge gangway between railroad cars An articulated bridge as a component of a detachable gangway floor plate between two articulated interconnected railroad cars, the bridge being provided with several elongated bridge elements arranged in succession laterally, and running transverse to the... | 04/30/1991 |
| 5003698 | Apparatus for viewing a representation of the celestial vault An apparatus for viewing a representation of the celestial vault including a tube bearing a ring of graduations that indicate the dates of the days of a year, and a tube bearing a ring of graduations that indicate the hours of a day. The tubes are axially... | 04/02/1991 |
| 5004514 | Method of making protective book coverings A protective book covering including a relatively long piece of sheet material and a relatively short piece of sheet material overlying the long piece, the longitudinal edges of the two sheets being sealed together. A seal and tear line extending transver... | 04/02/1991 |
| 4976286 | Four-way slide valve A four-way slide valve including an elongated valve body having an inlet port, an outlet port, and two working ports. A slide assembly within the body is movable longitudinally to alternatively interconnect the outlet port with one or the other of the wor... | 12/11/1990 |
| 4964530 | Bottom panel for containers The subject matter of the invention is a bottom panel for ventilated containers. The bottom panel is provided with an upper surface plate layer (1) and a lower surface plate layer (2), both layers being held in position by means of a spacer layer (3) of r... | 10/23/1990 |
| 4963261 | Microporous membrane having a macroporous support A porous structure comprising a macroporous support and a microporous membrane adhered to the outside surface of the support. Each of the support and membrane may be formed of a synthetic polymer, the polymers of the support and membrane usually being dif... | 10/16/1990 |
| 4942825 | Connect platform for rail vehicles The object of the invention is a diaphragm for passsenger railway cars, which consists of a platform (5) and a diaphragm (36, 2, 3) disposed in tunnel fashion over the platform. The system is so constructed that it provides good protection for the interio... | 07/24/1990 |
| 4921208 | Proportional flow valve A proportional flow valve wherein inlet fluid pressure urges the valve member toward the valve set. A pressure member, which may be a rolling diaphragm, has an effective area about equal to that of the valve orifice and is also subjected to inlet fluid pr... | 05/01/1990 |
| 4905328 | Sofa-bed assembly A sofa-bed assembly comprising a rear vertical section, a lower horizontal section, a front vertical section, and an upper horizontal section pivoted to one another in succession for folding movement between a collapsed sofa condition and an extended bed ... | 03/06/1990 |
| 4901938 | Electrical cord retractor An electrical cord retractor includes a closed hollow case separate from any apparatus with which an electrical cord will be used. Within the case is a winder, such as a rotatable spool, and the case is openable to permit an electrical cord to be wound up... | 02/20/1990 |
| 4893837 | Protective book covering and method of making it A protective book covering including a relatively long piece of sheet material and a relatively short piece of sheet material overlaying the long piece, the longitudinal edges of the two sheets being sealed together. A seal and tear line extending transve... | 01/16/1990 |
| 4887293 | Trunk circuit with loop length gain equalization A key telephone system comprised of a key service unit connected to a plurality of local sets via four-wire conductors for providing full duplex signal communication between the key service unit and sets. Signals are carried by a first pair of each of the... | 12/12/1989 |
| 4887250 | Apparatus for reproducing the appearance of heavenly bodies An apparatus for reproducing the appearance of heavenly bodies including a cover having an opaque wall defining a substantially circular opening, and a disc-like or spherical part representative of a heavenly body sized to substantially fill the opening i... | 12/12/1989 |
| 4875725 | Woven-wire gate lock A lock, particularly adapted for use with the gate of a woven-wire partition, includes a housing having a faceplate, a wall projecting from the faceplate and substantially surrounding the interior of the housing, and a removable cover for closing the hous... | 10/24/1989 |
| 4870116 | Dye-containing porous plastic element and method of making it A dye-containing porous plastic element, comprising a plastic body having interconnected capillary passageways, and a dry, water-soluble dye located within the passageways. The passageways extend to at least one surface of the body, and the size of the pa... | 09/26/1989 |
| 4866622 | Drive system for motor vehicles A drive system for a motor vehicle comprising a power train made up of an IC engine with an associated transmission and a brake system, operating elements for control of the power train and control devices for modifying the function of the power train to ... | 09/12/1989 |
| 4852725 | Carrying and storage case for artist's supplies A carrying and storage case for artist's supplies including a tray-like base and a plurality of rows of receptacles within the base, each row containing a plurality of receptacles. The axes of all the receptacles are at an acute angle to the plane of the ... | 08/01/1989 |
| 4843617 | Apparatus and method for synchronizing a communication system Apparatus and method for synchronizing a local clock signal with a remote clock signal. The local clock signal is divided by a digital counter for generating a phase increment signal. The phase increment signal and the remote clock signal are applied to a... | 06/27/1989 |
| 4797243 | Dye-containing porous plastic element and method of making it A dye-containing porous plastic element, comprising a plastic body having interconnected capillary passageways, and a dry, water-soluble dye located within the passageways. The passageways extend to at least one surface of the body, and the size of the pa... | 01/10/1989 |
| 4793166 | Multi-use lock cylinder A lock cylinder for use with either a deadbolt lock or a key-in-the-knob lock. The lock cylinder includes a hollow cylindrical body having a radially projecting, pin-containing chamber, extending along the length of the body, and a cylinder plug rotatably... | 12/27/1988 |
| 4791639 | Communications switching system A communication switching system for routing digital voice and data signals and message signals between a plurality of peripheral circuits disposed in one or more peripheral subsystems and a main controller. Each peripheral subsystem is comprised of a per... | 12/13/1988 |
| 4770958 | Storage battery having a protective shield A storage battery provided with a cover located over the top wall of the battery casing, the cover being vented so that any gases within the space between the cover and top wall can flow to the atmosphere. An end shield is located alongside each end wall ... | 09/13/1988 |
| 4756446 | Double-walled container A double-walled container formed of synthetic resinous material, including generally hemispherically-shaped outer and inner walls nested together with a gap between the walls, a flange extending from the outer periphery of the inner wall to the top edge o... | 07/12/1988 |
| 4757209 | Drive for a neutron chopper In order to make possible precisely controlled and reliable operation of the rotors of a neutron chopper each rotor is to be driven by a hysteresis motor, whose rotor is in the form of a hollow cylinder. The attachment of each drive rotor to the one end o... | 07/12/1988 |
| 4736177 | Solenoid actuator with electrical connection modules A solenoid actuator including a coil of electrically conductive wire, a yoke of magnetic material surrounding the coil, and a non-electrically and non-magnetically conductive material encapsulating the coil and yoke. A pair of terminals connected to the e... | 04/05/1988 |
| 4727578 | Telephone system A key telephone system comprised of a key service unit connected to a plurality of local sets via four-wire conductors for providing full duplex signal communication between the key service unit and sets. Signals are carried by a first pair of each of the... | 02/23/1988 |
| 4725802 | Solenoid actuator with stationary armature extension A solenoid actuator including a coil of electrically conductive wire having a central opening, a yoke of magnetic material permanently surrounding the coil, and a stationary armature permanently secured to the yoke and projecting from the yoke into the ce... | 02/16/1988 |
